Merge branch 'linus' into x86/urgent, to refresh the tree
Signed-off-by: Ingo Molnar <mingo@kernel.org>hifive-unleashed-5.1
Ingo Molnar
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06cd3d8c14
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font-size="324"
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||||
id="text26"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
sodipodi:linespacing="125%">Update-Mostly, Need Consistent Data</text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="5625"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text28"
|
||||
sodipodi:linespacing="125%"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"><tspan
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
id="tspan3029">(RCU Might Be OK...)</tspan></text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="7875"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text30"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
sodipodi:linespacing="125%">(1) Provide Existence Guarantees For Update-Friendly Mechanisms</text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="8325"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text32"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
sodipodi:linespacing="125%">(2) Provide Wait-Free Read-Side Primitives for Real-Time Use)</text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="7425"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text34"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
sodipodi:linespacing="125%">(RCU is Very Unlikely to be the Right Tool For The Job, But it Can:</text>
|
||||
</g>
|
||||
</svg>
|
||||
|
Before Width: | Height: | Size: 10 KiB |
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
|
|
@ -1,108 +0,0 @@
|
|||
#!/bin/sh
|
||||
#
|
||||
# Usage: sh htmlqqz.sh file
|
||||
#
|
||||
# Extracts and converts quick quizzes in a proto-HTML document file.htmlx.
|
||||
# Commands, all of which must be on a line by themselves:
|
||||
#
|
||||
# "<p>@@QQ@@": Start of a quick quiz.
|
||||
# "<p>@@QQA@@": Start of a quick-quiz answer.
|
||||
# "<p>@@QQE@@": End of a quick-quiz answer, and thus of the quick quiz.
|
||||
# "<p>@@QQAL@@": Place to put quick-quiz answer list.
|
||||
#
|
||||
# Places the result in file.html.
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 2 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program; if not, you can access it online at
|
||||
# http://www.gnu.org/licenses/gpl-2.0.html.
|
||||
#
|
||||
# Copyright (c) 2013 Paul E. McKenney, IBM Corporation.
|
||||
|
||||
fn=$1
|
||||
if test ! -r $fn.htmlx
|
||||
then
|
||||
echo "Error: $fn.htmlx unreadable."
|
||||
exit 1
|
||||
fi
|
||||
|
||||
echo "<!-- DO NOT HAND EDIT. -->" > $fn.html
|
||||
echo "<!-- Instead, edit $fn.htmlx and run 'sh htmlqqz.sh $fn' -->" >> $fn.html
|
||||
awk < $fn.htmlx >> $fn.html '
|
||||
|
||||
state == "" && $1 != "<p>@@QQ@@" && $1 != "<p>@@QQAL@@" {
|
||||
print $0;
|
||||
if ($0 ~ /^<p>@@QQ/)
|
||||
print "Bad Quick Quiz command: " NR " (expected <p>@@QQ@@ or <p>@@QQAL@@)." > "/dev/stderr"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "" && $1 == "<p>@@QQ@@" {
|
||||
qqn++;
|
||||
qqlineno = NR;
|
||||
haveqq = 1;
|
||||
state = "qq";
|
||||
print "<p><a name=\"Quick Quiz " qqn "\"><b>Quick Quiz " qqn "</b>:</a>"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "qq" && $1 != "<p>@@QQA@@" {
|
||||
qq[qqn] = qq[qqn] $0 "\n";
|
||||
print $0
|
||||
if ($0 ~ /^<p>@@QQ/)
|
||||
print "Bad Quick Quiz command: " NR ". (expected <p>@@QQA@@)" > "/dev/stderr"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "qq" && $1 == "<p>@@QQA@@" {
|
||||
state = "qqa";
|
||||
print "<br><a href=\"#qq" qqn "answer\">Answer</a>"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "qqa" && $1 != "<p>@@QQE@@" {
|
||||
qqa[qqn] = qqa[qqn] $0 "\n";
|
||||
if ($0 ~ /^<p>@@QQ/)
|
||||
print "Bad Quick Quiz command: " NR " (expected <p>@@QQE@@)." > "/dev/stderr"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "qqa" && $1 == "<p>@@QQE@@" {
|
||||
state = "";
|
||||
next;
|
||||
}
|
||||
|
||||
state == "" && $1 == "<p>@@QQAL@@" {
|
||||
haveqq = "";
|
||||
print "<h3><a name=\"Answers to Quick Quizzes\">"
|
||||
print "Answers to Quick Quizzes</a></h3>"
|
||||
print "";
|
||||
for (i = 1; i <= qqn; i++) {
|
||||
print "<a name=\"qq" i "answer\"></a>"
|
||||
print "<p><b>Quick Quiz " i "</b>:"
|
||||
print qq[i];
|
||||
print "";
|
||||
print "</p><p><b>Answer</b>:"
|
||||
print qqa[i];
|
||||
print "";
|
||||
print "</p><p><a href=\"#Quick%20Quiz%20" i "\"><b>Back to Quick Quiz " i "</b>.</a>"
|
||||
print "";
|
||||
}
|
||||
next;
|
||||
}
|
||||
|
||||
END {
|
||||
if (state != "")
|
||||
print "Unterminated Quick Quiz: " qqlineno "." > "/dev/stderr"
|
||||
else if (haveqq)
|
||||
print "Missing \"<p>@@QQAL@@\", no Quick Quiz." > "/dev/stderr"
|
||||
}'
|
||||
|
|
@ -237,17 +237,17 @@ o "ktl" is the low-order 16 bits (in hexadecimal) of the count of
|
|||
|
||||
The output of "cat rcu/rcu_preempt/rcuexp" looks as follows:
|
||||
|
||||
s=21872 wd0=0 wd1=0 wd2=0 wd3=5 n=0 enq=0 sc=21872
|
||||
s=21872 wd1=0 wd2=0 wd3=5 n=0 enq=0 sc=21872
|
||||
|
||||
These fields are as follows:
|
||||
|
||||
o "s" is the sequence number, with an odd number indicating that
|
||||
an expedited grace period is in progress.
|
||||
|
||||
o "wd0", "wd1", "wd2", and "wd3" are the number of times that an
|
||||
attempt to start an expedited grace period found that someone
|
||||
else had completed an expedited grace period that satisfies the
|
||||
attempted request. "Our work is done."
|
||||
o "wd1", "wd2", and "wd3" are the number of times that an attempt
|
||||
to start an expedited grace period found that someone else had
|
||||
completed an expedited grace period that satisfies the attempted
|
||||
request. "Our work is done."
|
||||
|
||||
o "n" is number of times that a concurrent CPU-hotplug operation
|
||||
forced a fallback to a normal grace period.
|
||||
|
|
|
|||
|
|
@ -681,22 +681,30 @@ Although RCU can be used in many different ways, a very common use of
|
|||
RCU is analogous to reader-writer locking. The following unified
|
||||
diff shows how closely related RCU and reader-writer locking can be.
|
||||
|
||||
@@ -5,5 +5,5 @@ struct el {
|
||||
int data;
|
||||
/* Other data fields */
|
||||
};
|
||||
-rwlock_t listmutex;
|
||||
+spinlock_t listmutex;
|
||||
struct el head;
|
||||
|
||||
@@ -13,15 +14,15 @@
|
||||
struct list_head *lp;
|
||||
struct el *p;
|
||||
|
||||
- read_lock();
|
||||
- read_lock(&listmutex);
|
||||
- list_for_each_entry(p, head, lp) {
|
||||
+ rcu_read_lock();
|
||||
+ list_for_each_entry_rcu(p, head, lp) {
|
||||
if (p->key == key) {
|
||||
*result = p->data;
|
||||
- read_unlock();
|
||||
- read_unlock(&listmutex);
|
||||
+ rcu_read_unlock();
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
- read_unlock();
|
||||
- read_unlock(&listmutex);
|
||||
+ rcu_read_unlock();
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -732,7 +740,7 @@ Or, for those who prefer a side-by-side listing:
|
|||
5 int data; 5 int data;
|
||||
6 /* Other data fields */ 6 /* Other data fields */
|
||||
7 }; 7 };
|
||||
8 spinlock_t listmutex; 8 spinlock_t listmutex;
|
||||
8 rwlock_t listmutex; 8 spinlock_t listmutex;
|
||||
9 struct el head; 9 struct el head;
|
||||
|
||||
1 int search(long key, int *result) 1 int search(long key, int *result)
|
||||
|
|
@ -740,15 +748,15 @@ Or, for those who prefer a side-by-side listing:
|
|||
3 struct list_head *lp; 3 struct list_head *lp;
|
||||
4 struct el *p; 4 struct el *p;
|
||||
5 5
|
||||
6 read_lock(); 6 rcu_read_lock();
|
||||
6 read_lock(&listmutex); 6 rcu_read_lock();
|
||||
7 list_for_each_entry(p, head, lp) { 7 list_for_each_entry_rcu(p, head, lp) {
|
||||
8 if (p->key == key) { 8 if (p->key == key) {
|
||||
9 *result = p->data; 9 *result = p->data;
|
||||
10 read_unlock(); 10 rcu_read_unlock();
|
||||
10 read_unlock(&listmutex); 10 rcu_read_unlock();
|
||||
11 return 1; 11 return 1;
|
||||
12 } 12 }
|
||||
13 } 13 }
|
||||
14 read_unlock(); 14 rcu_read_unlock();
|
||||
14 read_unlock(&listmutex); 14 rcu_read_unlock();
|
||||
15 return 0; 15 return 0;
|
||||
16 } 16 }
|
||||
|
||||
|
|
|
|||
|
|
@ -1,50 +1,29 @@
|
|||
Device-Tree binding for regmap
|
||||
|
||||
The endianness mode of CPU & Device scenarios:
|
||||
Index Device Endianness properties
|
||||
---------------------------------------------------
|
||||
1 BE 'big-endian'
|
||||
2 LE 'little-endian'
|
||||
3 Native 'native-endian'
|
||||
|
||||
For one device driver, which will run in different scenarios above
|
||||
on different SoCs using the devicetree, we need one way to simplify
|
||||
this.
|
||||
Devicetree binding for regmap
|
||||
|
||||
Optional properties:
|
||||
- {big,little,native}-endian: these are boolean properties, if absent
|
||||
then the implementation will choose a default based on the device
|
||||
being controlled. These properties are for register values and all
|
||||
the buffers only. Native endian means that the CPU and device have
|
||||
the same endianness.
|
||||
|
||||
little-endian,
|
||||
big-endian,
|
||||
native-endian: See common-properties.txt for a definition
|
||||
|
||||
Note:
|
||||
Regmap defaults to little-endian register access on MMIO based
|
||||
devices, this is by far the most common setting. On CPU
|
||||
architectures that typically run big-endian operating systems
|
||||
(e.g. PowerPC), registers can be defined as big-endian and must
|
||||
be marked that way in the devicetree.
|
||||
|
||||
On SoCs that can be operated in both big-endian and little-endian
|
||||
modes, with a single hardware switch controlling both the endianess
|
||||
of the CPU and a byteswap for MMIO registers (e.g. many Broadcom MIPS
|
||||
chips), "native-endian" is used to allow using the same device tree
|
||||
blob in both cases.
|
||||
|
||||
Examples:
|
||||
Scenario 1 : CPU in LE mode & device in LE mode.
|
||||
Scenario 1 : a register set in big-endian mode.
|
||||
dev: dev@40031000 {
|
||||
compatible = "name";
|
||||
compatible = "syscon";
|
||||
reg = <0x40031000 0x1000>;
|
||||
...
|
||||
};
|
||||
|
||||
Scenario 2 : CPU in LE mode & device in BE mode.
|
||||
dev: dev@40031000 {
|
||||
compatible = "name";
|
||||
reg = <0x40031000 0x1000>;
|
||||
...
|
||||
big-endian;
|
||||
};
|
||||
|
||||
Scenario 3 : CPU in BE mode & device in BE mode.
|
||||
dev: dev@40031000 {
|
||||
compatible = "name";
|
||||
reg = <0x40031000 0x1000>;
|
||||
...
|
||||
};
|
||||
|
||||
Scenario 4 : CPU in BE mode & device in LE mode.
|
||||
dev: dev@40031000 {
|
||||
compatible = "name";
|
||||
reg = <0x40031000 0x1000>;
|
||||
...
|
||||
little-endian;
|
||||
};
|
||||
|
|
|
|||
|
|
@ -131,6 +131,7 @@ parameter is applicable:
|
|||
More X86-64 boot options can be found in
|
||||
Documentation/x86/x86_64/boot-options.txt .
|
||||
X86 Either 32-bit or 64-bit x86 (same as X86-32+X86-64)
|
||||
X86_UV SGI UV support is enabled.
|
||||
XEN Xen support is enabled
|
||||
|
||||
In addition, the following text indicates that the option:
|
||||
|
|
@ -542,6 +543,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
|
|||
Format: <int> (must be >=0)
|
||||
Default: 64
|
||||
|
||||
bau= [X86_UV] Enable the BAU on SGI UV. The default
|
||||
behavior is to disable the BAU (i.e. bau=0).
|
||||
Format: { "0" | "1" }
|
||||
0 - Disable the BAU.
|
||||
1 - Enable the BAU.
|
||||
unset - Disable the BAU.
|
||||
|
||||
baycom_epp= [HW,AX25]
|
||||
Format: <io>,<mode>
|
||||
|
||||
|
|
@ -3284,6 +3292,44 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
|
|||
Lazy RCU callbacks are those which RCU can
|
||||
prove do nothing more than free memory.
|
||||
|
||||
rcuperf.gp_exp= [KNL]
|
||||
Measure performance of expedited synchronous
|
||||
grace-period primitives.
|
||||
|
||||
rcuperf.holdoff= [KNL]
|
||||
Set test-start holdoff period. The purpose of
|
||||
this parameter is to delay the start of the
|
||||
test until boot completes in order to avoid
|
||||
interference.
|
||||
|
||||
rcuperf.nreaders= [KNL]
|
||||
Set number of RCU readers. The value -1 selects
|
||||
N, where N is the number of CPUs. A value
|
||||
"n" less than -1 selects N-n+1, where N is again
|
||||
the number of CPUs. For example, -2 selects N
|
||||
(the number of CPUs), -3 selects N+1, and so on.
|
||||
A value of "n" less than or equal to -N selects
|
||||
a single reader.
|
||||
|
||||
rcuperf.nwriters= [KNL]
|
||||
Set number of RCU writers. The values operate
|
||||
the same as for rcuperf.nreaders.
|
||||
N, where N is the number of CPUs
|
||||
|
||||
rcuperf.perf_runnable= [BOOT]
|
||||
Start rcuperf running at boot time.
|
||||
|
||||
rcuperf.shutdown= [KNL]
|
||||
Shut the system down after performance tests
|
||||
complete. This is useful for hands-off automated
|
||||
testing.
|
||||
|
||||
rcuperf.perf_type= [KNL]
|
||||
Specify the RCU implementation to test.
|
||||
|
||||
rcuperf.verbose= [KNL]
|
||||
Enable additional printk() statements.
|
||||
|
||||
rcutorture.cbflood_inter_holdoff= [KNL]
|
||||
Set holdoff time (jiffies) between successive
|
||||
callback-flood tests.
|
||||
|
|
|
|||
|
|
@ -97,7 +97,7 @@ between any two lock-classes:
|
|||
<hardirq-safe> -> <hardirq-unsafe>
|
||||
<softirq-safe> -> <softirq-unsafe>
|
||||
|
||||
The first rule comes from the fact the a hardirq-safe lock could be
|
||||
The first rule comes from the fact that a hardirq-safe lock could be
|
||||
taken by a hardirq context, interrupting a hardirq-unsafe lock - and
|
||||
thus could result in a lock inversion deadlock. Likewise, a softirq-safe
|
||||
lock could be taken by an softirq context, interrupting a softirq-unsafe
|
||||
|
|
@ -220,7 +220,7 @@ calculated, which hash is unique for every lock chain. The hash value,
|
|||
when the chain is validated for the first time, is then put into a hash
|
||||
table, which hash-table can be checked in a lockfree manner. If the
|
||||
locking chain occurs again later on, the hash table tells us that we
|
||||
dont have to validate the chain again.
|
||||
don't have to validate the chain again.
|
||||
|
||||
Troubleshooting:
|
||||
----------------
|
||||
|
|
|
|||
|
|
@ -4,8 +4,40 @@
|
|||
|
||||
By: David Howells <dhowells@redhat.com>
|
||||
Paul E. McKenney <paulmck@linux.vnet.ibm.com>
|
||||
Will Deacon <will.deacon@arm.com>
|
||||
Peter Zijlstra <peterz@infradead.org>
|
||||
|
||||
Contents:
|
||||
==========
|
||||
DISCLAIMER
|
||||
==========
|
||||
|
||||
This document is not a specification; it is intentionally (for the sake of
|
||||
brevity) and unintentionally (due to being human) incomplete. This document is
|
||||
meant as a guide to using the various memory barriers provided by Linux, but
|
||||
in case of any doubt (and there are many) please ask.
|
||||
|
||||
To repeat, this document is not a specification of what Linux expects from
|
||||
hardware.
|
||||
|
||||
The purpose of this document is twofold:
|
||||
|
||||
(1) to specify the minimum functionality that one can rely on for any
|
||||
particular barrier, and
|
||||
|
||||
(2) to provide a guide as to how to use the barriers that are available.
|
||||
|
||||
Note that an architecture can provide more than the minimum requirement
|
||||
for any particular barrier, but if the architecure provides less than
|
||||
that, that architecture is incorrect.
|
||||
|
||||
Note also that it is possible that a barrier may be a no-op for an
|
||||
architecture because the way that arch works renders an explicit barrier
|
||||
unnecessary in that case.
|
||||
|
||||
|
||||
========
|
||||
CONTENTS
|
||||
========
|
||||
|
||||
(*) Abstract memory access model.
|
||||
|
||||
|
|
@ -31,15 +63,15 @@ Contents:
|
|||
|
||||
(*) Implicit kernel memory barriers.
|
||||
|
||||
- Locking functions.
|
||||
- Lock acquisition functions.
|
||||
- Interrupt disabling functions.
|
||||
- Sleep and wake-up functions.
|
||||
- Miscellaneous functions.
|
||||
|
||||
(*) Inter-CPU locking barrier effects.
|
||||
(*) Inter-CPU acquiring barrier effects.
|
||||
|
||||
- Locks vs memory accesses.
|
||||
- Locks vs I/O accesses.
|
||||
- Acquires vs memory accesses.
|
||||
- Acquires vs I/O accesses.
|
||||
|
||||
(*) Where are memory barriers needed?
|
||||
|
||||
|
|
@ -61,6 +93,7 @@ Contents:
|
|||
(*) The things CPUs get up to.
|
||||
|
||||
- And then there's the Alpha.
|
||||
- Virtual Machine Guests.
|
||||
|
||||
(*) Example uses.
|
||||
|
||||
|
|
@ -148,7 +181,7 @@ As a further example, consider this sequence of events:
|
|||
|
||||
CPU 1 CPU 2
|
||||
=============== ===============
|
||||
{ A == 1, B == 2, C = 3, P == &A, Q == &C }
|
||||
{ A == 1, B == 2, C == 3, P == &A, Q == &C }
|
||||
B = 4; Q = P;
|
||||
P = &B D = *Q;
|
||||
|
||||
|
|
@ -430,8 +463,9 @@ And a couple of implicit varieties:
|
|||
This acts as a one-way permeable barrier. It guarantees that all memory
|
||||
operations after the ACQUIRE operation will appear to happen after the
|
||||
ACQUIRE operation with respect to the other components of the system.
|
||||
ACQUIRE operations include LOCK operations and smp_load_acquire()
|
||||
operations.
|
||||
ACQUIRE operations include LOCK operations and both smp_load_acquire()
|
||||
and smp_cond_acquire() operations. The later builds the necessary ACQUIRE
|
||||
semantics from relying on a control dependency and smp_rmb().
|
||||
|
||||
Memory operations that occur before an ACQUIRE operation may appear to
|
||||
happen after it completes.
|
||||
|
|
@ -464,6 +498,11 @@ And a couple of implicit varieties:
|
|||
This means that ACQUIRE acts as a minimal "acquire" operation and
|
||||
RELEASE acts as a minimal "release" operation.
|
||||
|
||||
A subset of the atomic operations described in atomic_ops.txt have ACQUIRE
|
||||
and RELEASE variants in addition to fully-ordered and relaxed (no barrier
|
||||
semantics) definitions. For compound atomics performing both a load and a
|
||||
store, ACQUIRE semantics apply only to the load and RELEASE semantics apply
|
||||
only to the store portion of the operation.
|
||||
|
||||
Memory barriers are only required where there's a possibility of interaction
|
||||
between two CPUs or between a CPU and a device. If it can be guaranteed that
|
||||
|
|
@ -517,7 +556,7 @@ following sequence of events:
|
|||
|
||||
CPU 1 CPU 2
|
||||
=============== ===============
|
||||
{ A == 1, B == 2, C = 3, P == &A, Q == &C }
|
||||
{ A == 1, B == 2, C == 3, P == &A, Q == &C }
|
||||
B = 4;
|
||||
<write barrier>
|
||||
WRITE_ONCE(P, &B)
|
||||
|
|
@ -544,7 +583,7 @@ between the address load and the data load:
|
|||
|
||||
CPU 1 CPU 2
|
||||
=============== ===============
|
||||
{ A == 1, B == 2, C = 3, P == &A, Q == &C }
|
||||
{ A == 1, B == 2, C == 3, P == &A, Q == &C }
|
||||
B = 4;
|
||||
<write barrier>
|
||||
WRITE_ONCE(P, &B);
|
||||
|
|
@ -813,9 +852,10 @@ In summary:
|
|||
the same variable, then those stores must be ordered, either by
|
||||
preceding both of them with smp_mb() or by using smp_store_release()
|
||||
to carry out the stores. Please note that it is -not- sufficient
|
||||
to use barrier() at beginning of each leg of the "if" statement,
|
||||
as optimizing compilers do not necessarily respect barrier()
|
||||
in this case.
|
||||
to use barrier() at beginning of each leg of the "if" statement
|
||||
because, as shown by the example above, optimizing compilers can
|
||||
destroy the control dependency while respecting the letter of the
|
||||
barrier() law.
|
||||
|
||||
(*) Control dependencies require at least one run-time conditional
|
||||
between the prior load and the subsequent store, and this
|
||||
|
|
@ -1731,15 +1771,15 @@ The Linux kernel has eight basic CPU memory barriers:
|
|||
|
||||
|
||||
All memory barriers except the data dependency barriers imply a compiler
|
||||
barrier. Data dependencies do not impose any additional compiler ordering.
|
||||
barrier. Data dependencies do not impose any additional compiler ordering.
|
||||
|
||||
Aside: In the case of data dependencies, the compiler would be expected
|
||||
to issue the loads in the correct order (eg. `a[b]` would have to load
|
||||
the value of b before loading a[b]), however there is no guarantee in
|
||||
the C specification that the compiler may not speculate the value of b
|
||||
(eg. is equal to 1) and load a before b (eg. tmp = a[1]; if (b != 1)
|
||||
tmp = a[b]; ). There is also the problem of a compiler reloading b after
|
||||
having loaded a[b], thus having a newer copy of b than a[b]. A consensus
|
||||
tmp = a[b]; ). There is also the problem of a compiler reloading b after
|
||||
having loaded a[b], thus having a newer copy of b than a[b]. A consensus
|
||||
has not yet been reached about these problems, however the READ_ONCE()
|
||||
macro is a good place to start looking.
|
||||
|
||||
|
|
@ -1794,6 +1834,7 @@ There are some more advanced barrier functions:
|
|||
|
||||
|
||||
(*) lockless_dereference();
|
||||
|
||||
This can be thought of as a pointer-fetch wrapper around the
|
||||
smp_read_barrier_depends() data-dependency barrier.
|
||||
|
||||
|
|
@ -1858,7 +1899,7 @@ This is a variation on the mandatory write barrier that causes writes to weakly
|
|||
ordered I/O regions to be partially ordered. Its effects may go beyond the
|
||||
CPU->Hardware interface and actually affect the hardware at some level.
|
||||
|
||||
See the subsection "Locks vs I/O accesses" for more information.
|
||||
See the subsection "Acquires vs I/O accesses" for more information.
|
||||
|
||||
|
||||
===============================
|
||||
|
|
@ -1873,8 +1914,8 @@ provide more substantial guarantees, but these may not be relied upon outside
|
|||
of arch specific code.
|
||||
|
||||
|
||||
ACQUIRING FUNCTIONS
|
||||
-------------------
|
||||
LOCK ACQUISITION FUNCTIONS
|
||||
--------------------------
|
||||
|
||||
The Linux kernel has a number of locking constructs:
|
||||
|
||||
|
|
@ -1895,7 +1936,7 @@ for each construct. These operations all imply certain barriers:
|
|||
Memory operations issued before the ACQUIRE may be completed after
|
||||
the ACQUIRE operation has completed. An smp_mb__before_spinlock(),
|
||||
combined with a following ACQUIRE, orders prior stores against
|
||||
subsequent loads and stores. Note that this is weaker than smp_mb()!
|
||||
subsequent loads and stores. Note that this is weaker than smp_mb()!
|
||||
The smp_mb__before_spinlock() primitive is free on many architectures.
|
||||
|
||||
(2) RELEASE operation implication:
|
||||
|
|
@ -2090,9 +2131,9 @@ or:
|
|||
event_indicated = 1;
|
||||
wake_up_process(event_daemon);
|
||||
|
||||
A write memory barrier is implied by wake_up() and co. if and only if they wake
|
||||
something up. The barrier occurs before the task state is cleared, and so sits
|
||||
between the STORE to indicate the event and the STORE to set TASK_RUNNING:
|
||||
A write memory barrier is implied by wake_up() and co. if and only if they
|
||||
wake something up. The barrier occurs before the task state is cleared, and so
|
||||
sits between the STORE to indicate the event and the STORE to set TASK_RUNNING:
|
||||
|
||||
CPU 1 CPU 2
|
||||
=============================== ===============================
|
||||
|
|
@ -2206,7 +2247,7 @@ three CPUs; then should the following sequence of events occur:
|
|||
|
||||
Then there is no guarantee as to what order CPU 3 will see the accesses to *A
|
||||
through *H occur in, other than the constraints imposed by the separate locks
|
||||
on the separate CPUs. It might, for example, see:
|
||||
on the separate CPUs. It might, for example, see:
|
||||
|
||||
*E, ACQUIRE M, ACQUIRE Q, *G, *C, *F, *A, *B, RELEASE Q, *D, *H, RELEASE M
|
||||
|
||||
|
|
@ -2486,9 +2527,9 @@ The following operations are special locking primitives:
|
|||
clear_bit_unlock();
|
||||
__clear_bit_unlock();
|
||||
|
||||
These implement ACQUIRE-class and RELEASE-class operations. These should be used in
|
||||
preference to other operations when implementing locking primitives, because
|
||||
their implementations can be optimised on many architectures.
|
||||
These implement ACQUIRE-class and RELEASE-class operations. These should be
|
||||
used in preference to other operations when implementing locking primitives,
|
||||
because their implementations can be optimised on many architectures.
|
||||
|
||||
[!] Note that special memory barrier primitives are available for these
|
||||
situations because on some CPUs the atomic instructions used imply full memory
|
||||
|
|
@ -2568,12 +2609,12 @@ explicit barriers are used.
|
|||
|
||||
Normally this won't be a problem because the I/O accesses done inside such
|
||||
sections will include synchronous load operations on strictly ordered I/O
|
||||
registers that form implicit I/O barriers. If this isn't sufficient then an
|
||||
registers that form implicit I/O barriers. If this isn't sufficient then an
|
||||
mmiowb() may need to be used explicitly.
|
||||
|
||||
|
||||
A similar situation may occur between an interrupt routine and two routines
|
||||
running on separate CPUs that communicate with each other. If such a case is
|
||||
running on separate CPUs that communicate with each other. If such a case is
|
||||
likely, then interrupt-disabling locks should be used to guarantee ordering.
|
||||
|
||||
|
||||
|
|
@ -2587,8 +2628,8 @@ functions:
|
|||
(*) inX(), outX():
|
||||
|
||||
These are intended to talk to I/O space rather than memory space, but
|
||||
that's primarily a CPU-specific concept. The i386 and x86_64 processors do
|
||||
indeed have special I/O space access cycles and instructions, but many
|
||||
that's primarily a CPU-specific concept. The i386 and x86_64 processors
|
||||
do indeed have special I/O space access cycles and instructions, but many
|
||||
CPUs don't have such a concept.
|
||||
|
||||
The PCI bus, amongst others, defines an I/O space concept which - on such
|
||||
|
|
@ -2610,7 +2651,7 @@ functions:
|
|||
|
||||
Whether these are guaranteed to be fully ordered and uncombined with
|
||||
respect to each other on the issuing CPU depends on the characteristics
|
||||
defined for the memory window through which they're accessing. On later
|
||||
defined for the memory window through which they're accessing. On later
|
||||
i386 architecture machines, for example, this is controlled by way of the
|
||||
MTRR registers.
|
||||
|
||||
|
|
@ -2635,10 +2676,10 @@ functions:
|
|||
(*) readX_relaxed(), writeX_relaxed()
|
||||
|
||||
These are similar to readX() and writeX(), but provide weaker memory
|
||||
ordering guarantees. Specifically, they do not guarantee ordering with
|
||||
ordering guarantees. Specifically, they do not guarantee ordering with
|
||||
respect to normal memory accesses (e.g. DMA buffers) nor do they guarantee
|
||||
ordering with respect to LOCK or UNLOCK operations. If the latter is
|
||||
required, an mmiowb() barrier can be used. Note that relaxed accesses to
|
||||
ordering with respect to LOCK or UNLOCK operations. If the latter is
|
||||
required, an mmiowb() barrier can be used. Note that relaxed accesses to
|
||||
the same peripheral are guaranteed to be ordered with respect to each
|
||||
other.
|
||||
|
||||
|
|
@ -3040,8 +3081,9 @@ The Alpha defines the Linux kernel's memory barrier model.
|
|||
|
||||
See the subsection on "Cache Coherency" above.
|
||||
|
||||
|
||||
VIRTUAL MACHINE GUESTS
|
||||
-------------------
|
||||
----------------------
|
||||
|
||||
Guests running within virtual machines might be affected by SMP effects even if
|
||||
the guest itself is compiled without SMP support. This is an artifact of
|
||||
|
|
@ -3050,7 +3092,7 @@ barriers for this use-case would be possible but is often suboptimal.
|
|||
|
||||
To handle this case optimally, low-level virt_mb() etc macros are available.
|
||||
These have the same effect as smp_mb() etc when SMP is enabled, but generate
|
||||
identical code for SMP and non-SMP systems. For example, virtual machine guests
|
||||
identical code for SMP and non-SMP systems. For example, virtual machine guests
|
||||
should use virt_mb() rather than smp_mb() when synchronizing against a
|
||||
(possibly SMP) host.
|
||||
|
||||
|
|
@ -3058,6 +3100,7 @@ These are equivalent to smp_mb() etc counterparts in all other respects,
|
|||
in particular, they do not control MMIO effects: to control
|
||||
MMIO effects, use mandatory barriers.
|
||||
|
||||
|
||||
============
|
||||
EXAMPLE USES
|
||||
============
|
||||
|
|
|
|||
|
|
@ -60,6 +60,7 @@ show up in /proc/sys/kernel:
|
|||
- panic_on_warn
|
||||
- perf_cpu_time_max_percent
|
||||
- perf_event_paranoid
|
||||
- perf_event_max_stack
|
||||
- pid_max
|
||||
- powersave-nap [ PPC only ]
|
||||
- printk
|
||||
|
|
@ -654,6 +655,19 @@ users (without CAP_SYS_ADMIN). The default value is 2.
|
|||
|
||||
==============================================================
|
||||
|
||||
perf_event_max_stack:
|
||||
|
||||
Controls maximum number of stack frames to copy for (attr.sample_type &
|
||||
PERF_SAMPLE_CALLCHAIN) configured events, for instance, when using
|
||||
'perf record -g' or 'perf trace --call-graph fp'.
|
||||
|
||||
This can only be done when no events are in use that have callchains
|
||||
enabled, otherwise writing to this file will return -EBUSY.
|
||||
|
||||
The default value is 127.
|
||||
|
||||
==============================================================
|
||||
|
||||
pid_max:
|
||||
|
||||
PID allocation wrap value. When the kernel's next PID value
|
||||
|
|
|
|||
|
|
@ -1562,12 +1562,12 @@ Doing the same with chrt -r 5 and function-trace set.
|
|||
<idle>-0 3dN.1 12us : menu_hrtimer_cancel <-tick_nohz_idle_exit
|
||||
<idle>-0 3dN.1 12us : ktime_get <-tick_nohz_idle_exit
|
||||
<idle>-0 3dN.1 12us : tick_do_update_jiffies64 <-tick_nohz_idle_exit
|
||||
<idle>-0 3dN.1 13us : update_cpu_load_nohz <-tick_nohz_idle_exit
|
||||
<idle>-0 3dN.1 13us : _raw_spin_lock <-update_cpu_load_nohz
|
||||
<idle>-0 3dN.1 13us : cpu_load_update_nohz <-tick_nohz_idle_exit
|
||||
<idle>-0 3dN.1 13us : _raw_spin_lock <-cpu_load_update_nohz
|
||||
<idle>-0 3dN.1 13us : add_preempt_count <-_raw_spin_lock
|
||||
<idle>-0 3dN.2 13us : __update_cpu_load <-update_cpu_load_nohz
|
||||
<idle>-0 3dN.2 14us : sched_avg_update <-__update_cpu_load
|
||||
<idle>-0 3dN.2 14us : _raw_spin_unlock <-update_cpu_load_nohz
|
||||
<idle>-0 3dN.2 13us : __cpu_load_update <-cpu_load_update_nohz
|
||||
<idle>-0 3dN.2 14us : sched_avg_update <-__cpu_load_update
|
||||
<idle>-0 3dN.2 14us : _raw_spin_unlock <-cpu_load_update_nohz
|
||||
<idle>-0 3dN.2 14us : sub_preempt_count <-_raw_spin_unlock
|
||||
<idle>-0 3dN.1 15us : calc_load_exit_idle <-tick_nohz_idle_exit
|
||||
<idle>-0 3dN.1 15us : touch_softlockup_watchdog <-tick_nohz_idle_exit
|
||||
|
|
|
|||
|
|
@ -196,3 +196,35 @@ Another, more verbose way of getting PAT related debug messages is with
|
|||
"debugpat" boot parameter. With this parameter, various debug messages are
|
||||
printed to dmesg log.
|
||||
|
||||
PAT Initialization
|
||||
------------------
|
||||
|
||||
The following table describes how PAT is initialized under various
|
||||
configurations. The PAT MSR must be updated by Linux in order to support WC
|
||||
and WT attributes. Otherwise, the PAT MSR has the value programmed in it
|
||||
by the firmware. Note, Xen enables WC attribute in the PAT MSR for guests.
|
||||
|
||||
MTRR PAT Call Sequence PAT State PAT MSR
|
||||
=========================================================
|
||||
E E MTRR -> PAT init Enabled OS
|
||||
E D MTRR -> PAT init Disabled -
|
||||
D E MTRR -> PAT disable Disabled BIOS
|
||||
D D MTRR -> PAT disable Disabled -
|
||||
- np/E PAT -> PAT disable Disabled BIOS
|
||||
- np/D PAT -> PAT disable Disabled -
|
||||
E !P/E MTRR -> PAT init Disabled BIOS
|
||||
D !P/E MTRR -> PAT disable Disabled BIOS
|
||||
!M !P/E MTRR stub -> PAT disable Disabled BIOS
|
||||
|
||||
Legend
|
||||
------------------------------------------------
|
||||
E Feature enabled in CPU
|
||||
D Feature disabled/unsupported in CPU
|
||||
np "nopat" boot option specified
|
||||
!P CONFIG_X86_PAT option unset
|
||||
!M CONFIG_MTRR option unset
|
||||
Enabled PAT state set to enabled
|
||||
Disabled PAT state set to disabled
|
||||
OS PAT initializes PAT MSR with OS setting
|
||||
BIOS PAT keeps PAT MSR with BIOS setting
|
||||
|
||||
|
|
|
|||
2
Makefile
2
Makefile
|
|
@ -1,7 +1,7 @@
|
|||
VERSION = 4
|
||||
PATCHLEVEL = 6
|
||||
SUBLEVEL = 0
|
||||
EXTRAVERSION = -rc7
|
||||
EXTRAVERSION =
|
||||
NAME = Charred Weasel
|
||||
|
||||
# *DOCUMENTATION*
|
||||
|
|
|
|||
|
|
@ -63,7 +63,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
|
|||
return res >= 0 ? 1 : 0;
|
||||
}
|
||||
|
||||
static inline void __down_write(struct rw_semaphore *sem)
|
||||
static inline long ___down_write(struct rw_semaphore *sem)
|
||||
{
|
||||
long oldcount;
|
||||
#ifndef CONFIG_SMP
|
||||
|
|
@ -83,10 +83,24 @@ static inline void __down_write(struct rw_semaphore *sem)
|
|||
:"=&r" (oldcount), "=m" (sem->count), "=&r" (temp)
|
||||
:"Ir" (RWSEM_ACTIVE_WRITE_BIAS), "m" (sem->count) : "memory");
|
||||
#endif
|
||||
if (unlikely(oldcount))
|
||||
return oldcount;
|
||||
}
|
||||
|
||||
static inline void __down_write(struct rw_semaphore *sem)
|
||||
{
|
||||
if (unlikely(___down_write(sem)))
|
||||
rwsem_down_write_failed(sem);
|
||||
}
|
||||
|
||||
static inline int __down_write_killable(struct rw_semaphore *sem)
|
||||
{
|
||||
if (unlikely(___down_write(sem)))
|
||||
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
|
||||
return -EINTR;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* trylock for writing -- returns 1 if successful, 0 if contention
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -106,7 +106,7 @@
|
|||
|
||||
pmc: pmc@fffffc00 {
|
||||
compatible = "atmel,at91sam9x5-pmc", "syscon";
|
||||
reg = <0xfffffc00 0x100>;
|
||||
reg = <0xfffffc00 0x200>;
|
||||
interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
|
||||
interrupt-controller;
|
||||
#address-cells = <1>;
|
||||
|
|
|
|||
|
|
@ -280,7 +280,7 @@
|
|||
status = "disabled";
|
||||
|
||||
nfc@c0000000 {
|
||||
compatible = "atmel,sama5d4-nfc";
|
||||
compatible = "atmel,sama5d3-nfc";
|
||||
#address-cells = <1>;
|
||||
#size-cells = <1>;
|
||||
reg = < /* NFC Command Registers */
|
||||
|
|
|
|||
|
|
@ -17,33 +17,27 @@
|
|||
#include <asm/mach/map.h>
|
||||
#include <asm/mmu_context.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/ptrace.h>
|
||||
|
||||
#ifdef CONFIG_EFI
|
||||
void efi_init(void);
|
||||
|
||||
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
|
||||
int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
|
||||
|
||||
#define efi_call_virt(f, ...) \
|
||||
#define arch_efi_call_virt_setup() efi_virtmap_load()
|
||||
#define arch_efi_call_virt_teardown() efi_virtmap_unload()
|
||||
|
||||
#define arch_efi_call_virt(f, args...) \
|
||||
({ \
|
||||
efi_##f##_t *__f; \
|
||||
efi_status_t __s; \
|
||||
\
|
||||
efi_virtmap_load(); \
|
||||
__f = efi.systab->runtime->f; \
|
||||
__s = __f(__VA_ARGS__); \
|
||||
efi_virtmap_unload(); \
|
||||
__s; \
|
||||
__f(args); \
|
||||
})
|
||||
|
||||
#define __efi_call_virt(f, ...) \
|
||||
({ \
|
||||
efi_##f##_t *__f; \
|
||||
\
|
||||
efi_virtmap_load(); \
|
||||
__f = efi.systab->runtime->f; \
|
||||
__f(__VA_ARGS__); \
|
||||
efi_virtmap_unload(); \
|
||||
})
|
||||
#define ARCH_EFI_IRQ_FLAGS_MASK \
|
||||
(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
|
||||
PSR_T_BIT | MODE_MASK)
|
||||
|
||||
static inline void efi_set_pgd(struct mm_struct *mm)
|
||||
{
|
||||
|
|
@ -59,7 +53,16 @@ void efi_virtmap_unload(void);
|
|||
|
||||
/* arch specific definitions used by the stub code */
|
||||
|
||||
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
|
||||
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
|
||||
#define __efi_call_early(f, ...) f(__VA_ARGS__)
|
||||
#define efi_is_64bit() (false)
|
||||
|
||||
struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
|
||||
void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
|
||||
|
||||
static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
|
||||
{
|
||||
}
|
||||
|
||||
/*
|
||||
* A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
|
||||
|
|
|
|||
|
|
@ -15,6 +15,7 @@
|
|||
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/preempt.h>
|
||||
#include <asm/cacheflush.h>
|
||||
#include <asm/cachetype.h>
|
||||
#include <asm/proc-fns.h>
|
||||
|
|
@ -66,6 +67,7 @@ static inline void check_and_switch_context(struct mm_struct *mm,
|
|||
cpu_switch_mm(mm->pgd, mm);
|
||||
}
|
||||
|
||||
#ifndef MODULE
|
||||
#define finish_arch_post_lock_switch \
|
||||
finish_arch_post_lock_switch
|
||||
static inline void finish_arch_post_lock_switch(void)
|
||||
|
|
@ -87,6 +89,7 @@ static inline void finish_arch_post_lock_switch(void)
|
|||
preempt_enable_no_resched();
|
||||
}
|
||||
}
|
||||
#endif /* !MODULE */
|
||||
|
||||
#endif /* CONFIG_MMU */
|
||||
|
||||
|
|
|
|||
|
|
@ -11,6 +11,41 @@
|
|||
#include <asm/mach/map.h>
|
||||
#include <asm/mmu_context.h>
|
||||
|
||||
static int __init set_permissions(pte_t *ptep, pgtable_t token,
|
||||
unsigned long addr, void *data)
|
||||
{
|
||||
efi_memory_desc_t *md = data;
|
||||
pte_t pte = *ptep;
|
||||
|
||||
if (md->attribute & EFI_MEMORY_RO)
|
||||
pte = set_pte_bit(pte, __pgprot(L_PTE_RDONLY));
|
||||
if (md->attribute & EFI_MEMORY_XP)
|
||||
pte = set_pte_bit(pte, __pgprot(L_PTE_XN));
|
||||
set_pte_ext(ptep, pte, PTE_EXT_NG);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int __init efi_set_mapping_permissions(struct mm_struct *mm,
|
||||
efi_memory_desc_t *md)
|
||||
{
|
||||
unsigned long base, size;
|
||||
|
||||
base = md->virt_addr;
|
||||
size = md->num_pages << EFI_PAGE_SHIFT;
|
||||
|
||||
/*
|
||||
* We can only use apply_to_page_range() if we can guarantee that the
|
||||
* entire region was mapped using pages. This should be the case if the
|
||||
* region does not cover any naturally aligned SECTION_SIZE sized
|
||||
* blocks.
|
||||
*/
|
||||
if (round_down(base + size, SECTION_SIZE) <
|
||||
round_up(base, SECTION_SIZE) + SECTION_SIZE)
|
||||
return apply_to_page_range(mm, base, size, set_permissions, md);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
|
||||
{
|
||||
struct map_desc desc = {
|
||||
|
|
@ -34,5 +69,11 @@ int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
|
|||
desc.type = MT_DEVICE;
|
||||
|
||||
create_mapping_late(mm, &desc, true);
|
||||
|
||||
/*
|
||||
* If stricter permissions were specified, apply them now.
|
||||
*/
|
||||
if (md->attribute & (EFI_MEMORY_RO | EFI_MEMORY_XP))
|
||||
return efi_set_mapping_permissions(mm, md);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -631,7 +631,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
|
|||
info->address &= ~alignment_mask;
|
||||
info->ctrl.len <<= offset;
|
||||
|
||||
if (!bp->overflow_handler) {
|
||||
if (is_default_overflow_handler(bp)) {
|
||||
/*
|
||||
* Mismatch breakpoints are required for single-stepping
|
||||
* breakpoints.
|
||||
|
|
@ -754,7 +754,7 @@ static void watchpoint_handler(unsigned long addr, unsigned int fsr,
|
|||
* mismatch breakpoint so we can single-step over the
|
||||
* watchpoint trigger.
|
||||
*/
|
||||
if (!wp->overflow_handler)
|
||||
if (is_default_overflow_handler(wp))
|
||||
enable_single_step(wp, instruction_pointer(regs));
|
||||
|
||||
unlock:
|
||||
|
|
|
|||
|
|
@ -75,7 +75,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
|
|||
|
||||
tail = (struct frame_tail __user *)regs->ARM_fp - 1;
|
||||
|
||||
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
|
||||
while ((entry->nr < sysctl_perf_event_max_stack) &&
|
||||
tail && !((unsigned long)tail & 0x3))
|
||||
tail = user_backtrace(tail, entry);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -883,7 +883,8 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
|
|||
request_resource(&ioport_resource, &lp2);
|
||||
}
|
||||
|
||||
#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
|
||||
#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) || \
|
||||
defined(CONFIG_EFI)
|
||||
struct screen_info screen_info = {
|
||||
.orig_video_lines = 30,
|
||||
.orig_video_cols = 80,
|
||||
|
|
|
|||
|
|
@ -2,6 +2,7 @@ menu "Platform selection"
|
|||
|
||||
config ARCH_SUNXI
|
||||
bool "Allwinner sunxi 64-bit SoC Family"
|
||||
select GENERIC_IRQ_CHIP
|
||||
help
|
||||
This enables support for Allwinner sunxi based SoCs like the A64.
|
||||
|
||||
|
|
|
|||
|
|
@ -4,6 +4,7 @@
|
|||
#include <asm/io.h>
|
||||
#include <asm/mmu_context.h>
|
||||
#include <asm/neon.h>
|
||||
#include <asm/ptrace.h>
|
||||
#include <asm/tlbflush.h>
|
||||
|
||||
#ifdef CONFIG_EFI
|
||||
|
|
@ -14,32 +15,29 @@ extern void efi_init(void);
|
|||
|
||||
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
|
||||
|
||||
#define efi_call_virt(f, ...) \
|
||||
#define efi_set_mapping_permissions efi_create_mapping
|
||||
|
||||
#define arch_efi_call_virt_setup() \
|
||||
({ \
|
||||
efi_##f##_t *__f; \
|
||||
efi_status_t __s; \
|
||||
\
|
||||
kernel_neon_begin(); \
|
||||
efi_virtmap_load(); \
|
||||
__f = efi.systab->runtime->f; \
|
||||
__s = __f(__VA_ARGS__); \
|
||||
efi_virtmap_unload(); \
|
||||
kernel_neon_end(); \
|
||||
__s; \
|
||||
})
|
||||
|
||||
#define __efi_call_virt(f, ...) \
|
||||
#define arch_efi_call_virt(f, args...) \
|
||||
({ \
|
||||
efi_##f##_t *__f; \
|
||||
\
|
||||
kernel_neon_begin(); \
|
||||
efi_virtmap_load(); \
|
||||
__f = efi.systab->runtime->f; \
|
||||
__f(__VA_ARGS__); \
|
||||
__f(args); \
|
||||
})
|
||||
|
||||
#define arch_efi_call_virt_teardown() \
|
||||
({ \
|
||||
efi_virtmap_unload(); \
|
||||
kernel_neon_end(); \
|
||||
})
|
||||
|
||||
#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
|
||||
|
||||
/* arch specific definitions used by the stub code */
|
||||
|
||||
/*
|
||||
|
|
@ -50,7 +48,16 @@ int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
|
|||
#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
|
||||
#define MAX_FDT_OFFSET SZ_512M
|
||||
|
||||
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
|
||||
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
|
||||
#define __efi_call_early(f, ...) f(__VA_ARGS__)
|
||||
#define efi_is_64bit() (true)
|
||||
|
||||
#define alloc_screen_info(x...) &screen_info
|
||||
#define free_screen_info(x...)
|
||||
|
||||
static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
|
||||
{
|
||||
}
|
||||
|
||||
#define EFI_ALLOC_ALIGN SZ_64K
|
||||
|
||||
|
|
|
|||
|
|
@ -17,22 +17,51 @@
|
|||
|
||||
#include <asm/efi.h>
|
||||
|
||||
/*
|
||||
* Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
|
||||
* executable, everything else can be mapped with the XN bits
|
||||
* set. Also take the new (optional) RO/XP bits into account.
|
||||
*/
|
||||
static __init pteval_t create_mapping_protection(efi_memory_desc_t *md)
|
||||
{
|
||||
u64 attr = md->attribute;
|
||||
u32 type = md->type;
|
||||
|
||||
if (type == EFI_MEMORY_MAPPED_IO)
|
||||
return PROT_DEVICE_nGnRE;
|
||||
|
||||
if (WARN_ONCE(!PAGE_ALIGNED(md->phys_addr),
|
||||
"UEFI Runtime regions are not aligned to 64 KB -- buggy firmware?"))
|
||||
/*
|
||||
* If the region is not aligned to the page size of the OS, we
|
||||
* can not use strict permissions, since that would also affect
|
||||
* the mapping attributes of the adjacent regions.
|
||||
*/
|
||||
return pgprot_val(PAGE_KERNEL_EXEC);
|
||||
|
||||
/* R-- */
|
||||
if ((attr & (EFI_MEMORY_XP | EFI_MEMORY_RO)) ==
|
||||
(EFI_MEMORY_XP | EFI_MEMORY_RO))
|
||||
return pgprot_val(PAGE_KERNEL_RO);
|
||||
|
||||
/* R-X */
|
||||
if (attr & EFI_MEMORY_RO)
|
||||
return pgprot_val(PAGE_KERNEL_ROX);
|
||||
|
||||
/* RW- */
|
||||
if (attr & EFI_MEMORY_XP || type != EFI_RUNTIME_SERVICES_CODE)
|
||||
return pgprot_val(PAGE_KERNEL);
|
||||
|
||||
/* RWX */
|
||||
return pgprot_val(PAGE_KERNEL_EXEC);
|
||||
}
|
||||
|
||||
/* we will fill this structure from the stub, so don't put it in .bss */
|
||||
struct screen_info screen_info __section(.data);
|
||||
|
||||
int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
|
||||
{
|
||||
pteval_t prot_val;
|
||||
|
||||
/*
|
||||
* Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
|
||||
* executable, everything else can be mapped with the XN bits
|
||||
* set.
|
||||
*/
|
||||
if ((md->attribute & EFI_MEMORY_WB) == 0)
|
||||
prot_val = PROT_DEVICE_nGnRE;
|
||||
else if (md->type == EFI_RUNTIME_SERVICES_CODE ||
|
||||
!PAGE_ALIGNED(md->phys_addr))
|
||||
prot_val = pgprot_val(PAGE_KERNEL_EXEC);
|
||||
else
|
||||
prot_val = pgprot_val(PAGE_KERNEL);
|
||||
pteval_t prot_val = create_mapping_protection(md);
|
||||
|
||||
create_pgd_mapping(mm, md->phys_addr, md->virt_addr,
|
||||
md->num_pages << EFI_PAGE_SHIFT,
|
||||
|
|
|
|||
|
|
@ -616,7 +616,7 @@ static int breakpoint_handler(unsigned long unused, unsigned int esr,
|
|||
perf_bp_event(bp, regs);
|
||||
|
||||
/* Do we need to handle the stepping? */
|
||||
if (!bp->overflow_handler)
|
||||
if (is_default_overflow_handler(bp))
|
||||
step = 1;
|
||||
unlock:
|
||||
rcu_read_unlock();
|
||||
|
|
@ -712,7 +712,7 @@ static int watchpoint_handler(unsigned long addr, unsigned int esr,
|
|||
perf_bp_event(wp, regs);
|
||||
|
||||
/* Do we need to handle the stepping? */
|
||||
if (!wp->overflow_handler)
|
||||
if (is_default_overflow_handler(wp))
|
||||
step = 1;
|
||||
|
||||
unlock:
|
||||
|
|
|
|||
|
|
@ -112,6 +112,7 @@ __efistub___memset = KALLSYMS_HIDE(__pi_memset);
|
|||
__efistub__text = KALLSYMS_HIDE(_text);
|
||||
__efistub__end = KALLSYMS_HIDE(_end);
|
||||
__efistub__edata = KALLSYMS_HIDE(_edata);
|
||||
__efistub_screen_info = KALLSYMS_HIDE(screen_info);
|
||||
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -122,7 +122,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
|
|||
|
||||
tail = (struct frame_tail __user *)regs->regs[29];
|
||||
|
||||
while (entry->nr < PERF_MAX_STACK_DEPTH &&
|
||||
while (entry->nr < sysctl_perf_event_max_stack &&
|
||||
tail && !((unsigned long)tail & 0xf))
|
||||
tail = user_backtrace(tail, entry);
|
||||
} else {
|
||||
|
|
@ -132,7 +132,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
|
|||
|
||||
tail = (struct compat_frame_tail __user *)regs->compat_fp - 1;
|
||||
|
||||
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
|
||||
while ((entry->nr < sysctl_perf_event_max_stack) &&
|
||||
tail && !((unsigned long)tail & 0x3))
|
||||
tail = compat_user_backtrace(tail, entry);
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -476,6 +476,7 @@ emit_cond_jmp:
|
|||
case BPF_JGE:
|
||||
jmp_cond = A64_COND_CS;
|
||||
break;
|
||||
case BPF_JSET:
|
||||
case BPF_JNE:
|
||||
jmp_cond = A64_COND_NE;
|
||||
break;
|
||||
|
|
|
|||
|
|
@ -1,7 +1,6 @@
|
|||
#ifndef _ASM_IA64_IOMMU_H
|
||||
#define _ASM_IA64_IOMMU_H 1
|
||||
|
||||
#define cpu_has_x2apic 0
|
||||
/* 10 seconds */
|
||||
#define DMAR_OPERATION_TIMEOUT (((cycles_t) local_cpu_data->itc_freq)*10)
|
||||
|
||||
|
|
|
|||
|
|
@ -49,8 +49,8 @@ __down_read (struct rw_semaphore *sem)
|
|||
/*
|
||||
* lock for writing
|
||||
*/
|
||||
static inline void
|
||||
__down_write (struct rw_semaphore *sem)
|
||||
static inline long
|
||||
___down_write (struct rw_semaphore *sem)
|
||||
{
|
||||
long old, new;
|
||||
|
||||
|
|
@ -59,10 +59,26 @@ __down_write (struct rw_semaphore *sem)
|
|||
new = old + RWSEM_ACTIVE_WRITE_BIAS;
|
||||
} while (cmpxchg_acq(&sem->count, old, new) != old);
|
||||
|
||||
if (old != 0)
|
||||
return old;
|
||||
}
|
||||
|
||||
static inline void
|
||||
__down_write (struct rw_semaphore *sem)
|
||||
{
|
||||
if (___down_write(sem))
|
||||
rwsem_down_write_failed(sem);
|
||||
}
|
||||
|
||||
static inline int
|
||||
__down_write_killable (struct rw_semaphore *sem)
|
||||
{
|
||||
if (___down_write(sem))
|
||||
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
|
||||
return -EINTR;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* unlock after reading
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -531,8 +531,6 @@ efi_init (void)
|
|||
efi.systab->hdr.revision >> 16,
|
||||
efi.systab->hdr.revision & 0xffff, vendor);
|
||||
|
||||
set_bit(EFI_SYSTEM_TABLES, &efi.flags);
|
||||
|
||||
palo_phys = EFI_INVALID_TABLE_ADDR;
|
||||
|
||||
if (efi_config_init(arch_tables) != 0)
|
||||
|
|
|
|||
|
|
@ -65,7 +65,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
|
|||
|
||||
--frame;
|
||||
|
||||
while ((entry->nr < PERF_MAX_STACK_DEPTH) && frame)
|
||||
while ((entry->nr < sysctl_perf_event_max_stack) && frame)
|
||||
frame = user_backtrace(frame, entry);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -35,7 +35,7 @@ static void save_raw_perf_callchain(struct perf_callchain_entry *entry,
|
|||
addr = *sp++;
|
||||
if (__kernel_text_address(addr)) {
|
||||
perf_callchain_store(entry, addr);
|
||||
if (entry->nr >= PERF_MAX_STACK_DEPTH)
|
||||
if (entry->nr >= sysctl_perf_event_max_stack)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
@ -59,7 +59,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
|
|||
}
|
||||
do {
|
||||
perf_callchain_store(entry, pc);
|
||||
if (entry->nr >= PERF_MAX_STACK_DEPTH)
|
||||
if (entry->nr >= sysctl_perf_event_max_stack)
|
||||
break;
|
||||
pc = unwind_stack(current, &sp, pc, &ra);
|
||||
} while (pc);
|
||||
|
|
|
|||
|
|
@ -565,7 +565,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
|
|||
smp_ops->give_timebase();
|
||||
|
||||
/* Wait until cpu puts itself in the online & active maps */
|
||||
while (!cpu_online(cpu) || !cpu_active(cpu))
|
||||
while (!cpu_online(cpu))
|
||||
cpu_relax();
|
||||
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -247,7 +247,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
|
|||
sp = regs->gpr[1];
|
||||
perf_callchain_store(entry, next_ip);
|
||||
|
||||
while (entry->nr < PERF_MAX_STACK_DEPTH) {
|
||||
while (entry->nr < sysctl_perf_event_max_stack) {
|
||||
fp = (unsigned long __user *) sp;
|
||||
if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp))
|
||||
return;
|
||||
|
|
@ -453,7 +453,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry,
|
|||
sp = regs->gpr[1];
|
||||
perf_callchain_store(entry, next_ip);
|
||||
|
||||
while (entry->nr < PERF_MAX_STACK_DEPTH) {
|
||||
while (entry->nr < sysctl_perf_event_max_stack) {
|
||||
fp = (unsigned int __user *) (unsigned long) sp;
|
||||
if (!valid_user_sp(sp, 0) || read_user_stack_32(fp, &next_sp))
|
||||
return;
|
||||
|
|
|
|||
|
|
@ -90,7 +90,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
|
|||
/*
|
||||
* lock for writing
|
||||
*/
|
||||
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
|
||||
static inline long ___down_write(struct rw_semaphore *sem)
|
||||
{
|
||||
signed long old, new, tmp;
|
||||
|
||||
|
|
@ -104,13 +104,23 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
|
|||
: "=&d" (old), "=&d" (new), "=Q" (sem->count)
|
||||
: "Q" (sem->count), "m" (tmp)
|
||||
: "cc", "memory");
|
||||
if (old != 0)
|
||||
rwsem_down_write_failed(sem);
|
||||
|
||||
return old;
|
||||
}
|
||||
|
||||
static inline void __down_write(struct rw_semaphore *sem)
|
||||
{
|
||||
__down_write_nested(sem, 0);
|
||||
if (___down_write(sem))
|
||||
rwsem_down_write_failed(sem);
|
||||
}
|
||||
|
||||
static inline int __down_write_killable(struct rw_semaphore *sem)
|
||||
{
|
||||
if (___down_write(sem))
|
||||
if (IS_ERR(rwsem_down_write_failed_killable(sem)))
|
||||
return -EINTR;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -832,7 +832,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
|
|||
pcpu_attach_task(pcpu, tidle);
|
||||
pcpu_start_fn(pcpu, smp_start_secondary, NULL);
|
||||
/* Wait until cpu puts itself in the online & active maps */
|
||||
while (!cpu_online(cpu) || !cpu_active(cpu))
|
||||
while (!cpu_online(cpu))
|
||||
cpu_relax();
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -26,6 +26,7 @@ generic-y += percpu.h
|
|||
generic-y += poll.h
|
||||
generic-y += preempt.h
|
||||
generic-y += resource.h
|
||||
generic-y += rwsem.h
|
||||
generic-y += sembuf.h
|
||||
generic-y += serial.h
|
||||
generic-y += shmbuf.h
|
||||
|
|
|
|||
|
|
@ -1,132 +0,0 @@
|
|||
/*
|
||||
* include/asm-sh/rwsem.h: R/W semaphores for SH using the stuff
|
||||
* in lib/rwsem.c.
|
||||
*/
|
||||
|
||||
#ifndef _ASM_SH_RWSEM_H
|
||||
#define _ASM_SH_RWSEM_H
|
||||
|
||||
#ifndef _LINUX_RWSEM_H
|
||||
#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead"
|
||||
#endif
|
||||
|
||||
#ifdef __KERNEL__
|
||||
|
||||
#define RWSEM_UNLOCKED_VALUE 0x00000000
|
||||
#define RWSEM_ACTIVE_BIAS 0x00000001
|
||||
#define RWSEM_ACTIVE_MASK 0x0000ffff
|
||||
#define RWSEM_WAITING_BIAS (-0x00010000)
|
||||
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
|
||||
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
|
||||
|
||||
/*
|
||||
* lock for reading
|
||||
*/
|
||||
static inline void __down_read(struct rw_semaphore *sem)
|
||||
{
|
||||
if (atomic_inc_return((atomic_t *)(&sem->count)) > 0)
|
||||
smp_wmb();
|
||||
else
|
||||
rwsem_down_read_failed(sem);
|
||||
}
|
||||
|
||||
static inline int __down_read_trylock(struct rw_semaphore *sem)
|
||||
{
|
||||
int tmp;
|
||||
|
||||
while ((tmp = sem->count) >= 0) {
|
||||
if (tmp == cmpxchg(&sem->count, tmp,
|
||||
tmp + RWSEM_ACTIVE_READ_BIAS)) {
|
||||
smp_wmb();
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* lock for writing
|
||||
*/
|
||||
static inline void __down_write(struct rw_semaphore *sem)
|
||||
{
|
||||
int tmp;
|
||||
|
||||
tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS,
|
||||
(atomic_t *)(&sem->count));
|
||||
if (tmp == RWSEM_ACTIVE_WRITE_BIAS)
|
||||
smp_wmb();
|
||||
else
|
||||
rwsem_down_write_failed(sem);
|
||||
}
|
||||
|
||||
static inline int __down_write_trylock(struct rw_semaphore *sem)
|
||||
{
|
||||
int tmp;
|
||||
|
||||
tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
|
||||
RWSEM_ACTIVE_WRITE_BIAS);
|
||||
smp_wmb();
|
||||
return tmp == RWSEM_UNLOCKED_VALUE;
|
||||
}
|
||||
|
||||
/*
|
||||
* unlock after reading
|
||||
*/
|
||||
static inline void __up_read(struct rw_semaphore *sem)
|
||||
{
|
||||
int tmp;
|
||||
|
||||
smp_wmb();
|
||||
tmp = atomic_dec_return((atomic_t *)(&sem->count));
|
||||
if (tmp < -1 && (tmp & RWSEM_ACTIVE_MASK) == 0)
|
||||
rwsem_wake(sem);
|
||||
}
|
||||
|
||||
/*
|
||||
* unlock after writing
|
||||
*/
|
||||
static inline void __up_write(struct rw_semaphore *sem)
|
||||
{
|
||||
smp_wmb();
|
||||
if (atomic_sub_return(RWSEM_ACTIVE_WRITE_BIAS,
|
||||
(atomic_t *)(&sem->count)) < 0)
|
||||
rwsem_wake(sem);
|
||||
}
|
||||
|
||||
/*
|
||||
* implement atomic add functionality
|
||||
*/
|
||||
static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem)
|
||||
{
|
||||
atomic_add(delta, (atomic_t *)(&sem->count));
|
||||
}
|
||||
|
||||
/*
|
||||
* downgrade write lock to read lock
|
||||
*/
|
||||
static inline void __downgrade_write(struct rw_semaphore *sem)
|
||||
{
|
||||
int tmp;
|
||||
|
||||
smp_wmb();
|
||||
tmp = atomic_add_return(-RWSEM_WAITING_BIAS, (atomic_t *)(&sem->count));
|
||||
if (tmp < 0)
|
||||
rwsem_downgrade_wake(sem);
|
||||
}
|
||||
|
||||
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
|
||||
{
|
||||
__down_write(sem);
|
||||
}
|
||||
|
||||
/*
|
||||
* implement exchange and add functionality
|
||||
*/
|
||||
static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
|
||||
{
|
||||
smp_mb();
|
||||
return atomic_add_return(delta, (atomic_t *)(&sem->count));
|
||||
}
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
#endif /* _ASM_SH_RWSEM_H */
|
||||
|
|
@ -16,6 +16,7 @@ generic-y += mm-arch-hooks.h
|
|||
generic-y += module.h
|
||||
generic-y += mutex.h
|
||||
generic-y += preempt.h
|
||||
generic-y += rwsem.h
|
||||
generic-y += serial.h
|
||||
generic-y += trace_clock.h
|
||||
generic-y += types.h
|
||||
|
|
|
|||
|
|
@ -1,124 +0,0 @@
|
|||
/*
|
||||
* rwsem.h: R/W semaphores implemented using CAS
|
||||
*
|
||||
* Written by David S. Miller (davem@redhat.com), 2001.
|
||||
* Derived from asm-i386/rwsem.h
|
||||
*/
|
||||
#ifndef _SPARC64_RWSEM_H
|
||||
#define _SPARC64_RWSEM_H
|
||||
|
||||
#ifndef _LINUX_RWSEM_H
|
||||
#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead"
|
||||
#endif
|
||||
|
||||
#ifdef __KERNEL__
|
||||
|
||||
#define RWSEM_UNLOCKED_VALUE 0x00000000L
|
||||
#define RWSEM_ACTIVE_BIAS 0x00000001L
|
||||
#define RWSEM_ACTIVE_MASK 0xffffffffL
|
||||
#define RWSEM_WAITING_BIAS (-RWSEM_ACTIVE_MASK-1)
|
||||
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
|
||||
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
|
||||
|
||||
/*
|
||||
* lock for reading
|
||||
*/
|
||||
static inline void __down_read(struct rw_semaphore *sem)
|
||||
{
|
||||
if (unlikely(atomic64_inc_return((atomic64_t *)(&sem->count)) <= 0L))
|
||||
rwsem_down_read_failed(sem);
|
||||
}
|
||||
|
||||
static inline int __down_read_trylock(struct rw_semaphore *sem)
|
||||
{
|
||||
long tmp;
|
||||
|
||||
while ((tmp = sem->count) >= 0L) {
|
||||
if (tmp == cmpxchg(&sem->count, tmp,
|
||||
tmp + RWSEM_ACTIVE_READ_BIAS)) {
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* lock for writing
|
||||
*/
|
||||
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
|
||||
{
|
||||
long tmp;
|
||||
|
||||
tmp = atomic64_add_return(RWSEM_ACTIVE_WRITE_BIAS,
|
||||
(atomic64_t *)(&sem->count));
|
||||
if (unlikely(tmp != RWSEM_ACTIVE_WRITE_BIAS))
|
||||
rwsem_down_write_failed(sem);
|
||||
}
|
||||
|
||||
static inline void __down_write(struct rw_semaphore *sem)
|
||||
{
|
||||
__down_write_nested(sem, 0);
|
||||
}
|
||||
|
||||
static inline int __down_write_trylock(struct rw_semaphore *sem)
|
||||
{
|
||||
long tmp;
|
||||
|
||||
tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
|
||||
RWSEM_ACTIVE_WRITE_BIAS);
|
||||
return tmp == RWSEM_UNLOCKED_VALUE;
|
||||
}
|
||||
|
||||
/*
|
||||
* unlock after reading
|
||||
*/
|
||||
static inline void __up_read(struct rw_semaphore *sem)
|
||||
{
|
||||
long tmp;
|
||||
|
||||
tmp = atomic64_dec_return((atomic64_t *)(&sem->count));
|
||||
if (unlikely(tmp < -1L && (tmp & RWSEM_ACTIVE_MASK) == 0L))
|
||||
rwsem_wake(sem);
|
||||
}
|
||||
|
||||
/*
|
||||
* unlock after writing
|
||||
*/
|
||||
static inline void __up_write(struct rw_semaphore *sem)
|
||||
{
|
||||
if (unlikely(atomic64_sub_return(RWSEM_ACTIVE_WRITE_BIAS,
|
||||
(atomic64_t *)(&sem->count)) < 0L))
|
||||
rwsem_wake(sem);
|
||||
}
|
||||
|
||||
/*
|
||||
* implement atomic add functionality
|
||||
*/
|
||||
static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
|
||||
{
|
||||
atomic64_add(delta, (atomic64_t *)(&sem->count));
|
||||
}
|
||||
|
||||
/*
|
||||
* downgrade write lock to read lock
|
||||
*/
|
||||
static inline void __downgrade_write(struct rw_semaphore *sem)
|
||||
{
|
||||
long tmp;
|
||||
|
||||
tmp = atomic64_add_return(-RWSEM_WAITING_BIAS, (atomic64_t *)(&sem->count));
|
||||
if (tmp < 0L)
|
||||
rwsem_downgrade_wake(sem);
|
||||
}
|
||||
|
||||
/*
|
||||
* implement exchange and add functionality
|
||||
*/
|
||||
static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
|
||||
{
|
||||
return atomic64_add_return(delta, (atomic64_t *)(&sem->count));
|
||||
}
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
#endif /* _SPARC64_RWSEM_H */
|
||||
|
|
@ -1756,7 +1756,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
|
|||
}
|
||||
}
|
||||
#endif
|
||||
} while (entry->nr < PERF_MAX_STACK_DEPTH);
|
||||
} while (entry->nr < sysctl_perf_event_max_stack);
|
||||
}
|
||||
|
||||
static inline int
|
||||
|
|
@ -1790,7 +1790,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
|
|||
pc = sf.callers_pc;
|
||||
ufp = (unsigned long)sf.fp + STACK_BIAS;
|
||||
perf_callchain_store(entry, pc);
|
||||
} while (entry->nr < PERF_MAX_STACK_DEPTH);
|
||||
} while (entry->nr < sysctl_perf_event_max_stack);
|
||||
}
|
||||
|
||||
static void perf_callchain_user_32(struct perf_callchain_entry *entry,
|
||||
|
|
@ -1822,7 +1822,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry,
|
|||
ufp = (unsigned long)sf.fp;
|
||||
}
|
||||
perf_callchain_store(entry, pc);
|
||||
} while (entry->nr < PERF_MAX_STACK_DEPTH);
|
||||
} while (entry->nr < sysctl_perf_event_max_stack);
|
||||
}
|
||||
|
||||
void
|
||||
|
|
|
|||
|
|
@ -164,10 +164,6 @@ config INSTRUCTION_DECODER
|
|||
def_bool y
|
||||
depends on KPROBES || PERF_EVENTS || UPROBES
|
||||
|
||||
config PERF_EVENTS_INTEL_UNCORE
|
||||
def_bool y
|
||||
depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
|
||||
|
||||
config OUTPUT_FORMAT
|
||||
string
|
||||
default "elf32-i386" if X86_32
|
||||
|
|
@ -1046,6 +1042,8 @@ config X86_THERMAL_VECTOR
|
|||
def_bool y
|
||||
depends on X86_MCE_INTEL
|
||||
|
||||
source "arch/x86/events/Kconfig"
|
||||
|
||||
config X86_LEGACY_VM86
|
||||
bool "Legacy VM86 support"
|
||||
default n
|
||||
|
|
@ -1210,15 +1208,6 @@ config MICROCODE_OLD_INTERFACE
|
|||
def_bool y
|
||||
depends on MICROCODE
|
||||
|
||||
config PERF_EVENTS_AMD_POWER
|
||||
depends on PERF_EVENTS && CPU_SUP_AMD
|
||||
tristate "AMD Processor Power Reporting Mechanism"
|
||||
---help---
|
||||
Provide power reporting mechanism support for AMD processors.
|
||||
Currently, it leverages X86_FEATURE_ACC_POWER
|
||||
(CPUID Fn8000_0007_EDX[12]) interface to calculate the
|
||||
average power consumption on Family 15h processors.
|
||||
|
||||
config X86_MSR
|
||||
tristate "/dev/cpu/*/msr - Model-specific register support"
|
||||
---help---
|
||||
|
|
@ -1932,54 +1921,38 @@ config RELOCATABLE
|
|||
(CONFIG_PHYSICAL_START) is used as the minimum location.
|
||||
|
||||
config RANDOMIZE_BASE
|
||||
bool "Randomize the address of the kernel image"
|
||||
bool "Randomize the address of the kernel image (KASLR)"
|
||||
depends on RELOCATABLE
|
||||
default n
|
||||
---help---
|
||||
Randomizes the physical and virtual address at which the
|
||||
kernel image is decompressed, as a security feature that
|
||||
deters exploit attempts relying on knowledge of the location
|
||||
of kernel internals.
|
||||
In support of Kernel Address Space Layout Randomization (KASLR),
|
||||
this randomizes the physical address at which the kernel image
|
||||
is decompressed and the virtual address where the kernel
|
||||
image is mapped, as a security feature that deters exploit
|
||||
attempts relying on knowledge of the location of kernel
|
||||
code internals.
|
||||
|
||||
Entropy is generated using the RDRAND instruction if it is
|
||||
supported. If RDTSC is supported, it is used as well. If
|
||||
neither RDRAND nor RDTSC are supported, then randomness is
|
||||
read from the i8254 timer.
|
||||
The kernel physical and virtual address can be randomized
|
||||
from 16MB up to 1GB on 64-bit and 512MB on 32-bit. (Note that
|
||||
using RANDOMIZE_BASE reduces the memory space available to
|
||||
kernel modules from 1.5GB to 1GB.)
|
||||
|
||||
The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET,
|
||||
and aligned according to PHYSICAL_ALIGN. Since the kernel is
|
||||
built using 2GiB addressing, and PHYSICAL_ALGIN must be at a
|
||||
minimum of 2MiB, only 10 bits of entropy is theoretically
|
||||
possible. At best, due to page table layouts, 64-bit can use
|
||||
9 bits of entropy and 32-bit uses 8 bits.
|
||||
Entropy is generated using the RDRAND instruction if it is
|
||||
supported. If RDTSC is supported, its value is mixed into
|
||||
the entropy pool as well. If neither RDRAND nor RDTSC are
|
||||
supported, then entropy is read from the i8254 timer.
|
||||
|
||||
If unsure, say N.
|
||||
Since the kernel is built using 2GB addressing, and
|
||||
PHYSICAL_ALIGN must be at a minimum of 2MB, only 10 bits of
|
||||
entropy is theoretically possible. Currently, with the
|
||||
default value for PHYSICAL_ALIGN and due to page table
|
||||
layouts, 64-bit uses 9 bits of entropy and 32-bit uses 8 bits.
|
||||
|
||||
config RANDOMIZE_BASE_MAX_OFFSET
|
||||
hex "Maximum kASLR offset allowed" if EXPERT
|
||||
depends on RANDOMIZE_BASE
|
||||
range 0x0 0x20000000 if X86_32
|
||||
default "0x20000000" if X86_32
|
||||
range 0x0 0x40000000 if X86_64
|
||||
default "0x40000000" if X86_64
|
||||
---help---
|
||||
The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical
|
||||
memory is used to determine the maximal offset in bytes that will
|
||||
be applied to the kernel when kernel Address Space Layout
|
||||
Randomization (kASLR) is active. This must be a multiple of
|
||||
PHYSICAL_ALIGN.
|
||||
If CONFIG_HIBERNATE is also enabled, KASLR is disabled at boot
|
||||
time. To enable it, boot with "kaslr" on the kernel command
|
||||
line (which will also disable hibernation).
|
||||
|
||||
On 32-bit this is limited to 512MiB by page table layouts. The
|
||||
default is 512MiB.
|
||||
|
||||
On 64-bit this is limited by how the kernel fixmap page table is
|
||||
positioned, so this cannot be larger than 1GiB currently. Without
|
||||
RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel
|
||||
and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the
|
||||
modules area will shrink to compensate, up to the current maximum
|
||||
1GiB to 1GiB split. The default is 1GiB.
|
||||
|
||||
If unsure, leave at the default value.
|
||||
If unsure, say N.
|
||||
|
||||
# Relocation on x86 needs some additional build support
|
||||
config X86_NEED_RELOCS
|
||||
|
|
|
|||
|
|
@ -208,7 +208,8 @@ endif
|
|||
|
||||
head-y := arch/x86/kernel/head_$(BITS).o
|
||||
head-y += arch/x86/kernel/head$(BITS).o
|
||||
head-y += arch/x86/kernel/head.o
|
||||
head-y += arch/x86/kernel/ebda.o
|
||||
head-y += arch/x86/kernel/platform-quirks.o
|
||||
|
||||
libs-y += arch/x86/lib/
|
||||
|
||||
|
|
|
|||
|
|
@ -86,16 +86,7 @@ $(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
|
|||
|
||||
SETUP_OBJS = $(addprefix $(obj)/,$(setup-y))
|
||||
|
||||
sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|_end\)$$/\#define VO_\2 0x\1/p'
|
||||
|
||||
quiet_cmd_voffset = VOFFSET $@
|
||||
cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
|
||||
|
||||
targets += voffset.h
|
||||
$(obj)/voffset.h: vmlinux FORCE
|
||||
$(call if_changed,voffset)
|
||||
|
||||
sed-zoffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(startup_32\|startup_64\|efi32_stub_entry\|efi64_stub_entry\|efi_pe_entry\|input_data\|_end\|z_.*\)$$/\#define ZO_\2 0x\1/p'
|
||||
sed-zoffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(startup_32\|startup_64\|efi32_stub_entry\|efi64_stub_entry\|efi_pe_entry\|input_data\|_end\|_ehead\|_text\|z_.*\)$$/\#define ZO_\2 0x\1/p'
|
||||
|
||||
quiet_cmd_zoffset = ZOFFSET $@
|
||||
cmd_zoffset = $(NM) $< | sed -n $(sed-zoffset) > $@
|
||||
|
|
@ -106,7 +97,7 @@ $(obj)/zoffset.h: $(obj)/compressed/vmlinux FORCE
|
|||
|
||||
|
||||
AFLAGS_header.o += -I$(obj)
|
||||
$(obj)/header.o: $(obj)/voffset.h $(obj)/zoffset.h
|
||||
$(obj)/header.o: $(obj)/zoffset.h
|
||||
|
||||
LDFLAGS_setup.elf := -T
|
||||
$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE
|
||||
|
|
|
|||
|
|
@ -57,12 +57,27 @@ LDFLAGS_vmlinux := -T
|
|||
hostprogs-y := mkpiggy
|
||||
HOST_EXTRACFLAGS += -I$(srctree)/tools/include
|
||||
|
||||
sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p'
|
||||
|
||||
quiet_cmd_voffset = VOFFSET $@
|
||||
cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@
|
||||
|
||||
targets += ../voffset.h
|
||||
|
||||
$(obj)/../voffset.h: vmlinux FORCE
|
||||
$(call if_changed,voffset)
|
||||
|
||||
$(obj)/misc.o: $(obj)/../voffset.h
|
||||
|
||||
vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \
|
||||
$(obj)/string.o $(obj)/cmdline.o \
|
||||
$(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \
|
||||
$(obj)/piggy.o $(obj)/cpuflags.o
|
||||
|
||||
vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o
|
||||
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/aslr.o
|
||||
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o
|
||||
ifdef CONFIG_X86_64
|
||||
vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/pagetable.o
|
||||
endif
|
||||
|
||||
$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
|
||||
|
||||
|
|
@ -109,10 +124,8 @@ suffix-$(CONFIG_KERNEL_XZ) := xz
|
|||
suffix-$(CONFIG_KERNEL_LZO) := lzo
|
||||
suffix-$(CONFIG_KERNEL_LZ4) := lz4
|
||||
|
||||
RUN_SIZE = $(shell $(OBJDUMP) -h vmlinux | \
|
||||
$(CONFIG_SHELL) $(srctree)/arch/x86/tools/calc_run_size.sh)
|
||||
quiet_cmd_mkpiggy = MKPIGGY $@
|
||||
cmd_mkpiggy = $(obj)/mkpiggy $< $(RUN_SIZE) > $@ || ( rm -f $@ ; false )
|
||||
cmd_mkpiggy = $(obj)/mkpiggy $< > $@ || ( rm -f $@ ; false )
|
||||
|
||||
targets += piggy.S
|
||||
$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
|
||||
|
|
|
|||
|
|
@ -1,339 +0,0 @@
|
|||
#include "misc.h"
|
||||
|
||||
#include <asm/msr.h>
|
||||
#include <asm/archrandom.h>
|
||||
#include <asm/e820.h>
|
||||
|
||||
#include <generated/compile.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/uts.h>
|
||||
#include <linux/utsname.h>
|
||||
#include <generated/utsrelease.h>
|
||||
|
||||
/* Simplified build-specific string for starting entropy. */
|
||||
static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@"
|
||||
LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION;
|
||||
|
||||
#define I8254_PORT_CONTROL 0x43
|
||||
#define I8254_PORT_COUNTER0 0x40
|
||||
#define I8254_CMD_READBACK 0xC0
|
||||
#define I8254_SELECT_COUNTER0 0x02
|
||||
#define I8254_STATUS_NOTREADY 0x40
|
||||
static inline u16 i8254(void)
|
||||
{
|
||||
u16 status, timer;
|
||||
|
||||
do {
|
||||
outb(I8254_PORT_CONTROL,
|
||||
I8254_CMD_READBACK | I8254_SELECT_COUNTER0);
|
||||
status = inb(I8254_PORT_COUNTER0);
|
||||
timer = inb(I8254_PORT_COUNTER0);
|
||||
timer |= inb(I8254_PORT_COUNTER0) << 8;
|
||||
} while (status & I8254_STATUS_NOTREADY);
|
||||
|
||||
return timer;
|
||||
}
|
||||
|
||||
static unsigned long rotate_xor(unsigned long hash, const void *area,
|
||||
size_t size)
|
||||
{
|
||||
size_t i;
|
||||
unsigned long *ptr = (unsigned long *)area;
|
||||
|
||||
for (i = 0; i < size / sizeof(hash); i++) {
|
||||
/* Rotate by odd number of bits and XOR. */
|
||||
hash = (hash << ((sizeof(hash) * 8) - 7)) | (hash >> 7);
|
||||
hash ^= ptr[i];
|
||||
}
|
||||
|
||||
return hash;
|
||||
}
|
||||
|
||||
/* Attempt to create a simple but unpredictable starting entropy. */
|
||||
static unsigned long get_random_boot(void)
|
||||
{
|
||||
unsigned long hash = 0;
|
||||
|
||||
hash = rotate_xor(hash, build_str, sizeof(build_str));
|
||||
hash = rotate_xor(hash, real_mode, sizeof(*real_mode));
|
||||
|
||||
return hash;
|
||||
}
|
||||
|
||||
static unsigned long get_random_long(void)
|
||||
{
|
||||
#ifdef CONFIG_X86_64
|
||||
const unsigned long mix_const = 0x5d6008cbf3848dd3UL;
|
||||
#else
|
||||
const unsigned long mix_const = 0x3f39e593UL;
|
||||
#endif
|
||||
unsigned long raw, random = get_random_boot();
|
||||
bool use_i8254 = true;
|
||||
|
||||
debug_putstr("KASLR using");
|
||||
|
||||
if (has_cpuflag(X86_FEATURE_RDRAND)) {
|
||||
debug_putstr(" RDRAND");
|
||||
if (rdrand_long(&raw)) {
|
||||
random ^= raw;
|
||||
use_i8254 = false;
|
||||
}
|
||||
}
|
||||
|
||||
if (has_cpuflag(X86_FEATURE_TSC)) {
|
||||
debug_putstr(" RDTSC");
|
||||
raw = rdtsc();
|
||||
|
||||
random ^= raw;
|
||||
use_i8254 = false;
|
||||
}
|
||||
|
||||
if (use_i8254) {
|
||||
debug_putstr(" i8254");
|
||||
random ^= i8254();
|
||||
}
|
||||
|
||||
/* Circular multiply for better bit diffusion */
|
||||
asm("mul %3"
|
||||
: "=a" (random), "=d" (raw)
|
||||
: "a" (random), "rm" (mix_const));
|
||||
random += raw;
|
||||
|
||||
debug_putstr("...\n");
|
||||
|
||||
return random;
|
||||
}
|
||||
|
||||
struct mem_vector {
|
||||
unsigned long start;
|
||||
unsigned long size;
|
||||
};
|
||||
|
||||
#define MEM_AVOID_MAX 5
|
||||
static struct mem_vector mem_avoid[MEM_AVOID_MAX];
|
||||
|
||||
static bool mem_contains(struct mem_vector *region, struct mem_vector *item)
|
||||
{
|
||||
/* Item at least partially before region. */
|
||||
if (item->start < region->start)
|
||||
return false;
|
||||
/* Item at least partially after region. */
|
||||
if (item->start + item->size > region->start + region->size)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool mem_overlaps(struct mem_vector *one, struct mem_vector *two)
|
||||
{
|
||||
/* Item one is entirely before item two. */
|
||||
if (one->start + one->size <= two->start)
|
||||
return false;
|
||||
/* Item one is entirely after item two. */
|
||||
if (one->start >= two->start + two->size)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
static void mem_avoid_init(unsigned long input, unsigned long input_size,
|
||||
unsigned long output, unsigned long output_size)
|
||||
{
|
||||
u64 initrd_start, initrd_size;
|
||||
u64 cmd_line, cmd_line_size;
|
||||
unsigned long unsafe, unsafe_len;
|
||||
char *ptr;
|
||||
|
||||
/*
|
||||
* Avoid the region that is unsafe to overlap during
|
||||
* decompression (see calculations at top of misc.c).
|
||||
*/
|
||||
unsafe_len = (output_size >> 12) + 32768 + 18;
|
||||
unsafe = (unsigned long)input + input_size - unsafe_len;
|
||||
mem_avoid[0].start = unsafe;
|
||||
mem_avoid[0].size = unsafe_len;
|
||||
|
||||
/* Avoid initrd. */
|
||||
initrd_start = (u64)real_mode->ext_ramdisk_image << 32;
|
||||
initrd_start |= real_mode->hdr.ramdisk_image;
|
||||
initrd_size = (u64)real_mode->ext_ramdisk_size << 32;
|
||||
initrd_size |= real_mode->hdr.ramdisk_size;
|
||||
mem_avoid[1].start = initrd_start;
|
||||
mem_avoid[1].size = initrd_size;
|
||||
|
||||
/* Avoid kernel command line. */
|
||||
cmd_line = (u64)real_mode->ext_cmd_line_ptr << 32;
|
||||
cmd_line |= real_mode->hdr.cmd_line_ptr;
|
||||
/* Calculate size of cmd_line. */
|
||||
ptr = (char *)(unsigned long)cmd_line;
|
||||
for (cmd_line_size = 0; ptr[cmd_line_size++]; )
|
||||
;
|
||||
mem_avoid[2].start = cmd_line;
|
||||
mem_avoid[2].size = cmd_line_size;
|
||||
|
||||
/* Avoid heap memory. */
|
||||
mem_avoid[3].start = (unsigned long)free_mem_ptr;
|
||||
mem_avoid[3].size = BOOT_HEAP_SIZE;
|
||||
|
||||
/* Avoid stack memory. */
|
||||
mem_avoid[4].start = (unsigned long)free_mem_end_ptr;
|
||||
mem_avoid[4].size = BOOT_STACK_SIZE;
|
||||
}
|
||||
|
||||
/* Does this memory vector overlap a known avoided area? */
|
||||
static bool mem_avoid_overlap(struct mem_vector *img)
|
||||
{
|
||||
int i;
|
||||
struct setup_data *ptr;
|
||||
|
||||
for (i = 0; i < MEM_AVOID_MAX; i++) {
|
||||
if (mem_overlaps(img, &mem_avoid[i]))
|
||||
return true;
|
||||
}
|
||||
|
||||
/* Avoid all entries in the setup_data linked list. */
|
||||
ptr = (struct setup_data *)(unsigned long)real_mode->hdr.setup_data;
|
||||
while (ptr) {
|
||||
struct mem_vector avoid;
|
||||
|
||||
avoid.start = (unsigned long)ptr;
|
||||
avoid.size = sizeof(*ptr) + ptr->len;
|
||||
|
||||
if (mem_overlaps(img, &avoid))
|
||||
return true;
|
||||
|
||||
ptr = (struct setup_data *)(unsigned long)ptr->next;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static unsigned long slots[CONFIG_RANDOMIZE_BASE_MAX_OFFSET /
|
||||
CONFIG_PHYSICAL_ALIGN];
|
||||
static unsigned long slot_max;
|
||||
|
||||
static void slots_append(unsigned long addr)
|
||||
{
|
||||
/* Overflowing the slots list should be impossible. */
|
||||
if (slot_max >= CONFIG_RANDOMIZE_BASE_MAX_OFFSET /
|
||||
CONFIG_PHYSICAL_ALIGN)
|
||||
return;
|
||||
|
||||
slots[slot_max++] = addr;
|
||||
}
|
||||
|
||||
static unsigned long slots_fetch_random(void)
|
||||
{
|
||||
/* Handle case of no slots stored. */
|
||||
if (slot_max == 0)
|
||||
return 0;
|
||||
|
||||
return slots[get_random_long() % slot_max];
|
||||
}
|
||||
|
||||
static void process_e820_entry(struct e820entry *entry,
|
||||
unsigned long minimum,
|
||||
unsigned long image_size)
|
||||
{
|
||||
struct mem_vector region, img;
|
||||
|
||||
/* Skip non-RAM entries. */
|
||||
if (entry->type != E820_RAM)
|
||||
return;
|
||||
|
||||
/* Ignore entries entirely above our maximum. */
|
||||
if (entry->addr >= CONFIG_RANDOMIZE_BASE_MAX_OFFSET)
|
||||
return;
|
||||
|
||||
/* Ignore entries entirely below our minimum. */
|
||||
if (entry->addr + entry->size < minimum)
|
||||
return;
|
||||
|
||||
region.start = entry->addr;
|
||||
region.size = entry->size;
|
||||
|
||||
/* Potentially raise address to minimum location. */
|
||||
if (region.start < minimum)
|
||||
region.start = minimum;
|
||||
|
||||
/* Potentially raise address to meet alignment requirements. */
|
||||
region.start = ALIGN(region.start, CONFIG_PHYSICAL_ALIGN);
|
||||
|
||||
/* Did we raise the address above the bounds of this e820 region? */
|
||||
if (region.start > entry->addr + entry->size)
|
||||
return;
|
||||
|
||||
/* Reduce size by any delta from the original address. */
|
||||
region.size -= region.start - entry->addr;
|
||||
|
||||
/* Reduce maximum size to fit end of image within maximum limit. */
|
||||
if (region.start + region.size > CONFIG_RANDOMIZE_BASE_MAX_OFFSET)
|
||||
region.size = CONFIG_RANDOMIZE_BASE_MAX_OFFSET - region.start;
|
||||
|
||||
/* Walk each aligned slot and check for avoided areas. */
|
||||
for (img.start = region.start, img.size = image_size ;
|
||||
mem_contains(®ion, &img) ;
|
||||
img.start += CONFIG_PHYSICAL_ALIGN) {
|
||||
if (mem_avoid_overlap(&img))
|
||||
continue;
|
||||
slots_append(img.start);
|
||||
}
|
||||
}
|
||||
|
||||
static unsigned long find_random_addr(unsigned long minimum,
|
||||
unsigned long size)
|
||||
{
|
||||
int i;
|
||||
unsigned long addr;
|
||||
|
||||
/* Make sure minimum is aligned. */
|
||||
minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN);
|
||||
|
||||
/* Verify potential e820 positions, appending to slots list. */
|
||||
for (i = 0; i < real_mode->e820_entries; i++) {
|
||||
process_e820_entry(&real_mode->e820_map[i], minimum, size);
|
||||
}
|
||||
|
||||
return slots_fetch_random();
|
||||
}
|
||||
|
||||
unsigned char *choose_kernel_location(struct boot_params *boot_params,
|
||||
unsigned char *input,
|
||||
unsigned long input_size,
|
||||
unsigned char *output,
|
||||
unsigned long output_size)
|
||||
{
|
||||
unsigned long choice = (unsigned long)output;
|
||||
unsigned long random;
|
||||
|
||||
#ifdef CONFIG_HIBERNATION
|
||||
if (!cmdline_find_option_bool("kaslr")) {
|
||||
debug_putstr("KASLR disabled by default...\n");
|
||||
goto out;
|
||||
}
|
||||
#else
|
||||
if (cmdline_find_option_bool("nokaslr")) {
|
||||
debug_putstr("KASLR disabled by cmdline...\n");
|
||||
goto out;
|
||||
}
|
||||
#endif
|
||||
|
||||
boot_params->hdr.loadflags |= KASLR_FLAG;
|
||||
|
||||
/* Record the various known unsafe memory ranges. */
|
||||
mem_avoid_init((unsigned long)input, input_size,
|
||||
(unsigned long)output, output_size);
|
||||
|
||||
/* Walk e820 and find a random address. */
|
||||
random = find_random_addr(choice, output_size);
|
||||
if (!random) {
|
||||
debug_putstr("KASLR could not find suitable E820 region...\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Always enforce the minimum. */
|
||||
if (random < choice)
|
||||
goto out;
|
||||
|
||||
choice = random;
|
||||
out:
|
||||
return (unsigned char *)choice;
|
||||
}
|
||||
|
|
@ -15,9 +15,9 @@ static inline char rdfs8(addr_t addr)
|
|||
#include "../cmdline.c"
|
||||
static unsigned long get_cmd_line_ptr(void)
|
||||
{
|
||||
unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr;
|
||||
unsigned long cmd_line_ptr = boot_params->hdr.cmd_line_ptr;
|
||||
|
||||
cmd_line_ptr |= (u64)real_mode->ext_cmd_line_ptr << 32;
|
||||
cmd_line_ptr |= (u64)boot_params->ext_cmd_line_ptr << 32;
|
||||
|
||||
return cmd_line_ptr;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -571,312 +571,6 @@ free_handle:
|
|||
efi_call_early(free_pool, pci_handle);
|
||||
}
|
||||
|
||||
static void
|
||||
setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
|
||||
struct efi_pixel_bitmask pixel_info, int pixel_format)
|
||||
{
|
||||
if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
|
||||
si->lfb_depth = 32;
|
||||
si->lfb_linelength = pixels_per_scan_line * 4;
|
||||
si->red_size = 8;
|
||||
si->red_pos = 0;
|
||||
si->green_size = 8;
|
||||
si->green_pos = 8;
|
||||
si->blue_size = 8;
|
||||
si->blue_pos = 16;
|
||||
si->rsvd_size = 8;
|
||||
si->rsvd_pos = 24;
|
||||
} else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
|
||||
si->lfb_depth = 32;
|
||||
si->lfb_linelength = pixels_per_scan_line * 4;
|
||||
si->red_size = 8;
|
||||
si->red_pos = 16;
|
||||
si->green_size = 8;
|
||||
si->green_pos = 8;
|
||||
si->blue_size = 8;
|
||||
si->blue_pos = 0;
|
||||
si->rsvd_size = 8;
|
||||
si->rsvd_pos = 24;
|
||||
} else if (pixel_format == PIXEL_BIT_MASK) {
|
||||
find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
|
||||
find_bits(pixel_info.green_mask, &si->green_pos,
|
||||
&si->green_size);
|
||||
find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
|
||||
find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
|
||||
&si->rsvd_size);
|
||||
si->lfb_depth = si->red_size + si->green_size +
|
||||
si->blue_size + si->rsvd_size;
|
||||
si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
|
||||
} else {
|
||||
si->lfb_depth = 4;
|
||||
si->lfb_linelength = si->lfb_width / 2;
|
||||
si->red_size = 0;
|
||||
si->red_pos = 0;
|
||||
si->green_size = 0;
|
||||
si->green_pos = 0;
|
||||
si->blue_size = 0;
|
||||
si->blue_pos = 0;
|
||||
si->rsvd_size = 0;
|
||||
si->rsvd_pos = 0;
|
||||
}
|
||||
}
|
||||
|
||||
static efi_status_t
|
||||
__gop_query32(struct efi_graphics_output_protocol_32 *gop32,
|
||||
struct efi_graphics_output_mode_info **info,
|
||||
unsigned long *size, u64 *fb_base)
|
||||
{
|
||||
struct efi_graphics_output_protocol_mode_32 *mode;
|
||||
efi_status_t status;
|
||||
unsigned long m;
|
||||
|
||||
m = gop32->mode;
|
||||
mode = (struct efi_graphics_output_protocol_mode_32 *)m;
|
||||
|
||||
status = efi_early->call(gop32->query_mode, gop32,
|
||||
mode->mode, size, info);
|
||||
if (status != EFI_SUCCESS)
|
||||
return status;
|
||||
|
||||
*fb_base = mode->frame_buffer_base;
|
||||
return status;
|
||||
}
|
||||
|
||||
static efi_status_t
|
||||
setup_gop32(struct screen_info *si, efi_guid_t *proto,
|
||||
unsigned long size, void **gop_handle)
|
||||
{
|
||||
struct efi_graphics_output_protocol_32 *gop32, *first_gop;
|
||||
unsigned long nr_gops;
|
||||
u16 width, height;
|
||||
u32 pixels_per_scan_line;
|
||||
u32 ext_lfb_base;
|
||||
u64 fb_base;
|
||||
struct efi_pixel_bitmask pixel_info;
|
||||
int pixel_format;
|
||||
efi_status_t status;
|
||||
u32 *handles = (u32 *)(unsigned long)gop_handle;
|
||||
int i;
|
||||
|
||||
first_gop = NULL;
|
||||
gop32 = NULL;
|
||||
|
||||
nr_gops = size / sizeof(u32);
|
||||
for (i = 0; i < nr_gops; i++) {
|
||||
struct efi_graphics_output_mode_info *info = NULL;
|
||||
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
|
||||
bool conout_found = false;
|
||||
void *dummy = NULL;
|
||||
u32 h = handles[i];
|
||||
u64 current_fb_base;
|
||||
|
||||
status = efi_call_early(handle_protocol, h,
|
||||
proto, (void **)&gop32);
|
||||
if (status != EFI_SUCCESS)
|
||||
continue;
|
||||
|
||||
status = efi_call_early(handle_protocol, h,
|
||||
&conout_proto, &dummy);
|
||||
if (status == EFI_SUCCESS)
|
||||
conout_found = true;
|
||||
|
||||
status = __gop_query32(gop32, &info, &size, ¤t_fb_base);
|
||||
if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
|
||||
/*
|
||||
* Systems that use the UEFI Console Splitter may
|
||||
* provide multiple GOP devices, not all of which are
|
||||
* backed by real hardware. The workaround is to search
|
||||
* for a GOP implementing the ConOut protocol, and if
|
||||
* one isn't found, to just fall back to the first GOP.
|
||||
*/
|
||||
width = info->horizontal_resolution;
|
||||
height = info->vertical_resolution;
|
||||
pixel_format = info->pixel_format;
|
||||
pixel_info = info->pixel_information;
|
||||
pixels_per_scan_line = info->pixels_per_scan_line;
|
||||
fb_base = current_fb_base;
|
||||
|
||||
/*
|
||||
* Once we've found a GOP supporting ConOut,
|
||||
* don't bother looking any further.
|
||||
*/
|
||||
first_gop = gop32;
|
||||
if (conout_found)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Did we find any GOPs? */
|
||||
if (!first_gop)
|
||||
goto out;
|
||||
|
||||
/* EFI framebuffer */
|
||||
si->orig_video_isVGA = VIDEO_TYPE_EFI;
|
||||
|
||||
si->lfb_width = width;
|
||||
si->lfb_height = height;
|
||||
si->lfb_base = fb_base;
|
||||
|
||||
ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
|
||||
if (ext_lfb_base) {
|
||||
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
|
||||
si->ext_lfb_base = ext_lfb_base;
|
||||
}
|
||||
|
||||
si->pages = 1;
|
||||
|
||||
setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
|
||||
|
||||
si->lfb_size = si->lfb_linelength * si->lfb_height;
|
||||
|
||||
si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
|
||||
out:
|
||||
return status;
|
||||
}
|
||||
|
||||
static efi_status_t
|
||||
__gop_query64(struct efi_graphics_output_protocol_64 *gop64,
|
||||
struct efi_graphics_output_mode_info **info,
|
||||
unsigned long *size, u64 *fb_base)
|
||||
{
|
||||
struct efi_graphics_output_protocol_mode_64 *mode;
|
||||
efi_status_t status;
|
||||
unsigned long m;
|
||||
|
||||
m = gop64->mode;
|
||||
mode = (struct efi_graphics_output_protocol_mode_64 *)m;
|
||||
|
||||
status = efi_early->call(gop64->query_mode, gop64,
|
||||
mode->mode, size, info);
|
||||
if (status != EFI_SUCCESS)
|
||||
return status;
|
||||
|
||||
*fb_base = mode->frame_buffer_base;
|
||||
return status;
|
||||
}
|
||||
|
||||
static efi_status_t
|
||||
setup_gop64(struct screen_info *si, efi_guid_t *proto,
|
||||
unsigned long size, void **gop_handle)
|
||||
{
|
||||
struct efi_graphics_output_protocol_64 *gop64, *first_gop;
|
||||
unsigned long nr_gops;
|
||||
u16 width, height;
|
||||
u32 pixels_per_scan_line;
|
||||
u32 ext_lfb_base;
|
||||
u64 fb_base;
|
||||
struct efi_pixel_bitmask pixel_info;
|
||||
int pixel_format;
|
||||
efi_status_t status;
|
||||
u64 *handles = (u64 *)(unsigned long)gop_handle;
|
||||
int i;
|
||||
|
||||
first_gop = NULL;
|
||||
gop64 = NULL;
|
||||
|
||||
nr_gops = size / sizeof(u64);
|
||||
for (i = 0; i < nr_gops; i++) {
|
||||
struct efi_graphics_output_mode_info *info = NULL;
|
||||
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
|
||||
bool conout_found = false;
|
||||
void *dummy = NULL;
|
||||
u64 h = handles[i];
|
||||
u64 current_fb_base;
|
||||
|
||||
status = efi_call_early(handle_protocol, h,
|
||||
proto, (void **)&gop64);
|
||||
if (status != EFI_SUCCESS)
|
||||
continue;
|
||||
|
||||
status = efi_call_early(handle_protocol, h,
|
||||
&conout_proto, &dummy);
|
||||
if (status == EFI_SUCCESS)
|
||||
conout_found = true;
|
||||
|
||||
status = __gop_query64(gop64, &info, &size, ¤t_fb_base);
|
||||
if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
|
||||
/*
|
||||
* Systems that use the UEFI Console Splitter may
|
||||
* provide multiple GOP devices, not all of which are
|
||||
* backed by real hardware. The workaround is to search
|
||||
* for a GOP implementing the ConOut protocol, and if
|
||||
* one isn't found, to just fall back to the first GOP.
|
||||
*/
|
||||
width = info->horizontal_resolution;
|
||||
height = info->vertical_resolution;
|
||||
pixel_format = info->pixel_format;
|
||||
pixel_info = info->pixel_information;
|
||||
pixels_per_scan_line = info->pixels_per_scan_line;
|
||||
fb_base = current_fb_base;
|
||||
|
||||
/*
|
||||
* Once we've found a GOP supporting ConOut,
|
||||
* don't bother looking any further.
|
||||
*/
|
||||
first_gop = gop64;
|
||||
if (conout_found)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Did we find any GOPs? */
|
||||
if (!first_gop)
|
||||
goto out;
|
||||
|
||||
/* EFI framebuffer */
|
||||
si->orig_video_isVGA = VIDEO_TYPE_EFI;
|
||||
|
||||
si->lfb_width = width;
|
||||
si->lfb_height = height;
|
||||
si->lfb_base = fb_base;
|
||||
|
||||
ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
|
||||
if (ext_lfb_base) {
|
||||
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
|
||||
si->ext_lfb_base = ext_lfb_base;
|
||||
}
|
||||
|
||||
si->pages = 1;
|
||||
|
||||
setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
|
||||
|
||||
si->lfb_size = si->lfb_linelength * si->lfb_height;
|
||||
|
||||
si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
|
||||
out:
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* See if we have Graphics Output Protocol
|
||||
*/
|
||||
static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
|
||||
unsigned long size)
|
||||
{
|
||||
efi_status_t status;
|
||||
void **gop_handle = NULL;
|
||||
|
||||
status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
|
||||
size, (void **)&gop_handle);
|
||||
if (status != EFI_SUCCESS)
|
||||
return status;
|
||||
|
||||
status = efi_call_early(locate_handle,
|
||||
EFI_LOCATE_BY_PROTOCOL,
|
||||
proto, NULL, &size, gop_handle);
|
||||
if (status != EFI_SUCCESS)
|
||||
goto free_handle;
|
||||
|
||||
if (efi_early->is64)
|
||||
status = setup_gop64(si, proto, size, gop_handle);
|
||||
else
|
||||
status = setup_gop32(si, proto, size, gop_handle);
|
||||
|
||||
free_handle:
|
||||
efi_call_early(free_pool, gop_handle);
|
||||
return status;
|
||||
}
|
||||
|
||||
static efi_status_t
|
||||
setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
|
||||
{
|
||||
|
|
@ -1038,7 +732,7 @@ void setup_graphics(struct boot_params *boot_params)
|
|||
EFI_LOCATE_BY_PROTOCOL,
|
||||
&graphics_proto, NULL, &size, gop_handle);
|
||||
if (status == EFI_BUFFER_TOO_SMALL)
|
||||
status = setup_gop(si, &graphics_proto, size);
|
||||
status = efi_setup_gop(NULL, si, &graphics_proto, size);
|
||||
|
||||
if (status != EFI_SUCCESS) {
|
||||
size = 0;
|
||||
|
|
|
|||
|
|
@ -11,80 +11,6 @@
|
|||
|
||||
#define DESC_TYPE_CODE_DATA (1 << 0)
|
||||
|
||||
#define EFI_CONSOLE_OUT_DEVICE_GUID \
|
||||
EFI_GUID(0xd3b36f2c, 0xd551, 0x11d4, 0x9a, 0x46, 0x0, 0x90, 0x27, \
|
||||
0x3f, 0xc1, 0x4d)
|
||||
|
||||
#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR 0
|
||||
#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR 1
|
||||
#define PIXEL_BIT_MASK 2
|
||||
#define PIXEL_BLT_ONLY 3
|
||||
#define PIXEL_FORMAT_MAX 4
|
||||
|
||||
struct efi_pixel_bitmask {
|
||||
u32 red_mask;
|
||||
u32 green_mask;
|
||||
u32 blue_mask;
|
||||
u32 reserved_mask;
|
||||
};
|
||||
|
||||
struct efi_graphics_output_mode_info {
|
||||
u32 version;
|
||||
u32 horizontal_resolution;
|
||||
u32 vertical_resolution;
|
||||
int pixel_format;
|
||||
struct efi_pixel_bitmask pixel_information;
|
||||
u32 pixels_per_scan_line;
|
||||
} __packed;
|
||||
|
||||
struct efi_graphics_output_protocol_mode_32 {
|
||||
u32 max_mode;
|
||||
u32 mode;
|
||||
u32 info;
|
||||
u32 size_of_info;
|
||||
u64 frame_buffer_base;
|
||||
u32 frame_buffer_size;
|
||||
} __packed;
|
||||
|
||||
struct efi_graphics_output_protocol_mode_64 {
|
||||
u32 max_mode;
|
||||
u32 mode;
|
||||
u64 info;
|
||||
u64 size_of_info;
|
||||
u64 frame_buffer_base;
|
||||
u64 frame_buffer_size;
|
||||
} __packed;
|
||||
|
||||
struct efi_graphics_output_protocol_mode {
|
||||
u32 max_mode;
|
||||
u32 mode;
|
||||
unsigned long info;
|
||||
unsigned long size_of_info;
|
||||
u64 frame_buffer_base;
|
||||
unsigned long frame_buffer_size;
|
||||
} __packed;
|
||||
|
||||
struct efi_graphics_output_protocol_32 {
|
||||
u32 query_mode;
|
||||
u32 set_mode;
|
||||
u32 blt;
|
||||
u32 mode;
|
||||
};
|
||||
|
||||
struct efi_graphics_output_protocol_64 {
|
||||
u64 query_mode;
|
||||
u64 set_mode;
|
||||
u64 blt;
|
||||
u64 mode;
|
||||
};
|
||||
|
||||
struct efi_graphics_output_protocol {
|
||||
void *query_mode;
|
||||
unsigned long set_mode;
|
||||
unsigned long blt;
|
||||
struct efi_graphics_output_protocol_mode *mode;
|
||||
};
|
||||
|
||||
struct efi_uga_draw_protocol_32 {
|
||||
u32 get_mode;
|
||||
u32 set_mode;
|
||||
|
|
|
|||
|
|
@ -0,0 +1,22 @@
|
|||
/*
|
||||
* Callers outside of misc.c need access to the error reporting routines,
|
||||
* but the *_putstr() functions need to stay in misc.c because of how
|
||||
* memcpy() and memmove() are defined for the compressed boot environment.
|
||||
*/
|
||||
#include "misc.h"
|
||||
|
||||
void warn(char *m)
|
||||
{
|
||||
error_putstr("\n\n");
|
||||
error_putstr(m);
|
||||
error_putstr("\n\n");
|
||||
}
|
||||
|
||||
void error(char *m)
|
||||
{
|
||||
warn(m);
|
||||
error_putstr(" -- System halted");
|
||||
|
||||
while (1)
|
||||
asm("hlt");
|
||||
}
|
||||
|
|
@ -0,0 +1,7 @@
|
|||
#ifndef BOOT_COMPRESSED_ERROR_H
|
||||
#define BOOT_COMPRESSED_ERROR_H
|
||||
|
||||
void warn(char *m);
|
||||
void error(char *m);
|
||||
|
||||
#endif /* BOOT_COMPRESSED_ERROR_H */
|
||||
|
|
@ -176,7 +176,9 @@ preferred_addr:
|
|||
1:
|
||||
|
||||
/* Target address to relocate to for decompression */
|
||||
addl $z_extract_offset, %ebx
|
||||
movl BP_init_size(%esi), %eax
|
||||
subl $_end, %eax
|
||||
addl %eax, %ebx
|
||||
|
||||
/* Set up the stack */
|
||||
leal boot_stack_end(%ebx), %esp
|
||||
|
|
@ -233,24 +235,28 @@ relocated:
|
|||
2:
|
||||
|
||||
/*
|
||||
* Do the decompression, and jump to the new kernel..
|
||||
* Do the extraction, and jump to the new kernel..
|
||||
*/
|
||||
/* push arguments for decompress_kernel: */
|
||||
pushl $z_run_size /* size of kernel with .bss and .brk */
|
||||
/* push arguments for extract_kernel: */
|
||||
pushl $z_output_len /* decompressed length, end of relocs */
|
||||
leal z_extract_offset_negative(%ebx), %ebp
|
||||
|
||||
movl BP_init_size(%esi), %eax
|
||||
subl $_end, %eax
|
||||
movl %ebx, %ebp
|
||||
subl %eax, %ebp
|
||||
pushl %ebp /* output address */
|
||||
|
||||
pushl $z_input_len /* input_len */
|
||||
leal input_data(%ebx), %eax
|
||||
pushl %eax /* input_data */
|
||||
leal boot_heap(%ebx), %eax
|
||||
pushl %eax /* heap area */
|
||||
pushl %esi /* real mode pointer */
|
||||
call decompress_kernel /* returns kernel location in %eax */
|
||||
addl $28, %esp
|
||||
call extract_kernel /* returns kernel location in %eax */
|
||||
addl $24, %esp
|
||||
|
||||
/*
|
||||
* Jump to the decompressed kernel.
|
||||
* Jump to the extracted kernel.
|
||||
*/
|
||||
xorl %ebx, %ebx
|
||||
jmp *%eax
|
||||
|
|
|
|||
|
|
@ -110,7 +110,9 @@ ENTRY(startup_32)
|
|||
1:
|
||||
|
||||
/* Target address to relocate to for decompression */
|
||||
addl $z_extract_offset, %ebx
|
||||
movl BP_init_size(%esi), %eax
|
||||
subl $_end, %eax
|
||||
addl %eax, %ebx
|
||||
|
||||
/*
|
||||
* Prepare for entering 64 bit mode
|
||||
|
|
@ -132,7 +134,7 @@ ENTRY(startup_32)
|
|||
/* Initialize Page tables to 0 */
|
||||
leal pgtable(%ebx), %edi
|
||||
xorl %eax, %eax
|
||||
movl $((4096*6)/4), %ecx
|
||||
movl $(BOOT_INIT_PGT_SIZE/4), %ecx
|
||||
rep stosl
|
||||
|
||||
/* Build Level 4 */
|
||||
|
|
@ -338,7 +340,9 @@ preferred_addr:
|
|||
1:
|
||||
|
||||
/* Target address to relocate to for decompression */
|
||||
leaq z_extract_offset(%rbp), %rbx
|
||||
movl BP_init_size(%rsi), %ebx
|
||||
subl $_end, %ebx
|
||||
addq %rbp, %rbx
|
||||
|
||||
/* Set up the stack */
|
||||
leaq boot_stack_end(%rbx), %rsp
|
||||
|
|
@ -408,19 +412,16 @@ relocated:
|
|||
2:
|
||||
|
||||
/*
|
||||
* Do the decompression, and jump to the new kernel..
|
||||
* Do the extraction, and jump to the new kernel..
|
||||
*/
|
||||
pushq %rsi /* Save the real mode argument */
|
||||
movq $z_run_size, %r9 /* size of kernel with .bss and .brk */
|
||||
pushq %r9
|
||||
movq %rsi, %rdi /* real mode address */
|
||||
leaq boot_heap(%rip), %rsi /* malloc area for uncompression */
|
||||
leaq input_data(%rip), %rdx /* input_data */
|
||||
movl $z_input_len, %ecx /* input_len */
|
||||
movq %rbp, %r8 /* output target address */
|
||||
movq $z_output_len, %r9 /* decompressed length, end of relocs */
|
||||
call decompress_kernel /* returns kernel location in %rax */
|
||||
popq %r9
|
||||
call extract_kernel /* returns kernel location in %rax */
|
||||
popq %rsi
|
||||
|
||||
/*
|
||||
|
|
@ -485,4 +486,4 @@ boot_stack_end:
|
|||
.section ".pgtable","a",@nobits
|
||||
.balign 4096
|
||||
pgtable:
|
||||
.fill 6*4096, 1, 0
|
||||
.fill BOOT_PGT_SIZE, 1, 0
|
||||
|
|
|
|||
|
|
@ -0,0 +1,510 @@
|
|||
/*
|
||||
* kaslr.c
|
||||
*
|
||||
* This contains the routines needed to generate a reasonable level of
|
||||
* entropy to choose a randomized kernel base address offset in support
|
||||
* of Kernel Address Space Layout Randomization (KASLR). Additionally
|
||||
* handles walking the physical memory maps (and tracking memory regions
|
||||
* to avoid) in order to select a physical memory location that can
|
||||
* contain the entire properly aligned running kernel image.
|
||||
*
|
||||
*/
|
||||
#include "misc.h"
|
||||
#include "error.h"
|
||||
|
||||
#include <asm/msr.h>
|
||||
#include <asm/archrandom.h>
|
||||
#include <asm/e820.h>
|
||||
|
||||
#include <generated/compile.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/uts.h>
|
||||
#include <linux/utsname.h>
|
||||
#include <generated/utsrelease.h>
|
||||
|
||||
/* Simplified build-specific string for starting entropy. */
|
||||
static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@"
|
||||
LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION;
|
||||
|
||||
#define I8254_PORT_CONTROL 0x43
|
||||
#define I8254_PORT_COUNTER0 0x40
|
||||
#define I8254_CMD_READBACK 0xC0
|
||||
#define I8254_SELECT_COUNTER0 0x02
|
||||
#define I8254_STATUS_NOTREADY 0x40
|
||||
static inline u16 i8254(void)
|
||||
{
|
||||
u16 status, timer;
|
||||
|
||||
do {
|
||||
outb(I8254_PORT_CONTROL,
|
||||
I8254_CMD_READBACK | I8254_SELECT_COUNTER0);
|
||||
status = inb(I8254_PORT_COUNTER0);
|
||||
timer = inb(I8254_PORT_COUNTER0);
|
||||
timer |= inb(I8254_PORT_COUNTER0) << 8;
|
||||
} while (status & I8254_STATUS_NOTREADY);
|
||||
|
||||
return timer;
|
||||
}
|
||||
|
||||
static unsigned long rotate_xor(unsigned long hash, const void *area,
|
||||
size_t size)
|
||||
{
|
||||
size_t i;
|
||||
unsigned long *ptr = (unsigned long *)area;
|
||||
|
||||
for (i = 0; i < size / sizeof(hash); i++) {
|
||||
/* Rotate by odd number of bits and XOR. */
|
||||
hash = (hash << ((sizeof(hash) * 8) - 7)) | (hash >> 7);
|
||||
hash ^= ptr[i];
|
||||
}
|
||||
|
||||
return hash;
|
||||
}
|
||||
|
||||
/* Attempt to create a simple but unpredictable starting entropy. */
|
||||
static unsigned long get_random_boot(void)
|
||||
{
|
||||
unsigned long hash = 0;
|
||||
|
||||
hash = rotate_xor(hash, build_str, sizeof(build_str));
|
||||
hash = rotate_xor(hash, boot_params, sizeof(*boot_params));
|
||||
|
||||
return hash;
|
||||
}
|
||||
|
||||
static unsigned long get_random_long(const char *purpose)
|
||||
{
|
||||
#ifdef CONFIG_X86_64
|
||||
const unsigned long mix_const = 0x5d6008cbf3848dd3UL;
|
||||
#else
|
||||
const unsigned long mix_const = 0x3f39e593UL;
|
||||
#endif
|
||||
unsigned long raw, random = get_random_boot();
|
||||
bool use_i8254 = true;
|
||||
|
||||
debug_putstr(purpose);
|
||||
debug_putstr(" KASLR using");
|
||||
|
||||
if (has_cpuflag(X86_FEATURE_RDRAND)) {
|
||||
debug_putstr(" RDRAND");
|
||||
if (rdrand_long(&raw)) {
|
||||
random ^= raw;
|
||||
use_i8254 = false;
|
||||
}
|
||||
}
|
||||
|
||||
if (has_cpuflag(X86_FEATURE_TSC)) {
|
||||
debug_putstr(" RDTSC");
|
||||
raw = rdtsc();
|
||||
|
||||
random ^= raw;
|
||||
use_i8254 = false;
|
||||
}
|
||||
|
||||
if (use_i8254) {
|
||||
debug_putstr(" i8254");
|
||||
random ^= i8254();
|
||||
}
|
||||
|
||||
/* Circular multiply for better bit diffusion */
|
||||
asm("mul %3"
|
||||
: "=a" (random), "=d" (raw)
|
||||
: "a" (random), "rm" (mix_const));
|
||||
random += raw;
|
||||
|
||||
debug_putstr("...\n");
|
||||
|
||||
return random;
|
||||
}
|
||||
|
||||
struct mem_vector {
|
||||
unsigned long start;
|
||||
unsigned long size;
|
||||
};
|
||||
|
||||
enum mem_avoid_index {
|
||||
MEM_AVOID_ZO_RANGE = 0,
|
||||
MEM_AVOID_INITRD,
|
||||
MEM_AVOID_CMDLINE,
|
||||
MEM_AVOID_BOOTPARAMS,
|
||||
MEM_AVOID_MAX,
|
||||
};
|
||||
|
||||
static struct mem_vector mem_avoid[MEM_AVOID_MAX];
|
||||
|
||||
static bool mem_contains(struct mem_vector *region, struct mem_vector *item)
|
||||
{
|
||||
/* Item at least partially before region. */
|
||||
if (item->start < region->start)
|
||||
return false;
|
||||
/* Item at least partially after region. */
|
||||
if (item->start + item->size > region->start + region->size)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool mem_overlaps(struct mem_vector *one, struct mem_vector *two)
|
||||
{
|
||||
/* Item one is entirely before item two. */
|
||||
if (one->start + one->size <= two->start)
|
||||
return false;
|
||||
/* Item one is entirely after item two. */
|
||||
if (one->start >= two->start + two->size)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* In theory, KASLR can put the kernel anywhere in the range of [16M, 64T).
|
||||
* The mem_avoid array is used to store the ranges that need to be avoided
|
||||
* when KASLR searches for an appropriate random address. We must avoid any
|
||||
* regions that are unsafe to overlap with during decompression, and other
|
||||
* things like the initrd, cmdline and boot_params. This comment seeks to
|
||||
* explain mem_avoid as clearly as possible since incorrect mem_avoid
|
||||
* memory ranges lead to really hard to debug boot failures.
|
||||
*
|
||||
* The initrd, cmdline, and boot_params are trivial to identify for
|
||||
* avoiding. They are MEM_AVOID_INITRD, MEM_AVOID_CMDLINE, and
|
||||
* MEM_AVOID_BOOTPARAMS respectively below.
|
||||
*
|
||||
* What is not obvious how to avoid is the range of memory that is used
|
||||
* during decompression (MEM_AVOID_ZO_RANGE below). This range must cover
|
||||
* the compressed kernel (ZO) and its run space, which is used to extract
|
||||
* the uncompressed kernel (VO) and relocs.
|
||||
*
|
||||
* ZO's full run size sits against the end of the decompression buffer, so
|
||||
* we can calculate where text, data, bss, etc of ZO are positioned more
|
||||
* easily.
|
||||
*
|
||||
* For additional background, the decompression calculations can be found
|
||||
* in header.S, and the memory diagram is based on the one found in misc.c.
|
||||
*
|
||||
* The following conditions are already enforced by the image layouts and
|
||||
* associated code:
|
||||
* - input + input_size >= output + output_size
|
||||
* - kernel_total_size <= init_size
|
||||
* - kernel_total_size <= output_size (see Note below)
|
||||
* - output + init_size >= output + output_size
|
||||
*
|
||||
* (Note that kernel_total_size and output_size have no fundamental
|
||||
* relationship, but output_size is passed to choose_random_location
|
||||
* as a maximum of the two. The diagram is showing a case where
|
||||
* kernel_total_size is larger than output_size, but this case is
|
||||
* handled by bumping output_size.)
|
||||
*
|
||||
* The above conditions can be illustrated by a diagram:
|
||||
*
|
||||
* 0 output input input+input_size output+init_size
|
||||
* | | | | |
|
||||
* | | | | |
|
||||
* |-----|--------|--------|--------------|-----------|--|-------------|
|
||||
* | | |
|
||||
* | | |
|
||||
* output+init_size-ZO_INIT_SIZE output+output_size output+kernel_total_size
|
||||
*
|
||||
* [output, output+init_size) is the entire memory range used for
|
||||
* extracting the compressed image.
|
||||
*
|
||||
* [output, output+kernel_total_size) is the range needed for the
|
||||
* uncompressed kernel (VO) and its run size (bss, brk, etc).
|
||||
*
|
||||
* [output, output+output_size) is VO plus relocs (i.e. the entire
|
||||
* uncompressed payload contained by ZO). This is the area of the buffer
|
||||
* written to during decompression.
|
||||
*
|
||||
* [output+init_size-ZO_INIT_SIZE, output+init_size) is the worst-case
|
||||
* range of the copied ZO and decompression code. (i.e. the range
|
||||
* covered backwards of size ZO_INIT_SIZE, starting from output+init_size.)
|
||||
*
|
||||
* [input, input+input_size) is the original copied compressed image (ZO)
|
||||
* (i.e. it does not include its run size). This range must be avoided
|
||||
* because it contains the data used for decompression.
|
||||
*
|
||||
* [input+input_size, output+init_size) is [_text, _end) for ZO. This
|
||||
* range includes ZO's heap and stack, and must be avoided since it
|
||||
* performs the decompression.
|
||||
*
|
||||
* Since the above two ranges need to be avoided and they are adjacent,
|
||||
* they can be merged, resulting in: [input, output+init_size) which
|
||||
* becomes the MEM_AVOID_ZO_RANGE below.
|
||||
*/
|
||||
static void mem_avoid_init(unsigned long input, unsigned long input_size,
|
||||
unsigned long output)
|
||||
{
|
||||
unsigned long init_size = boot_params->hdr.init_size;
|
||||
u64 initrd_start, initrd_size;
|
||||
u64 cmd_line, cmd_line_size;
|
||||
char *ptr;
|
||||
|
||||
/*
|
||||
* Avoid the region that is unsafe to overlap during
|
||||
* decompression.
|
||||
*/
|
||||
mem_avoid[MEM_AVOID_ZO_RANGE].start = input;
|
||||
mem_avoid[MEM_AVOID_ZO_RANGE].size = (output + init_size) - input;
|
||||
add_identity_map(mem_avoid[MEM_AVOID_ZO_RANGE].start,
|
||||
mem_avoid[MEM_AVOID_ZO_RANGE].size);
|
||||
|
||||
/* Avoid initrd. */
|
||||
initrd_start = (u64)boot_params->ext_ramdisk_image << 32;
|
||||
initrd_start |= boot_params->hdr.ramdisk_image;
|
||||
initrd_size = (u64)boot_params->ext_ramdisk_size << 32;
|
||||
initrd_size |= boot_params->hdr.ramdisk_size;
|
||||
mem_avoid[MEM_AVOID_INITRD].start = initrd_start;
|
||||
mem_avoid[MEM_AVOID_INITRD].size = initrd_size;
|
||||
/* No need to set mapping for initrd, it will be handled in VO. */
|
||||
|
||||
/* Avoid kernel command line. */
|
||||
cmd_line = (u64)boot_params->ext_cmd_line_ptr << 32;
|
||||
cmd_line |= boot_params->hdr.cmd_line_ptr;
|
||||
/* Calculate size of cmd_line. */
|
||||
ptr = (char *)(unsigned long)cmd_line;
|
||||
for (cmd_line_size = 0; ptr[cmd_line_size++]; )
|
||||
;
|
||||
mem_avoid[MEM_AVOID_CMDLINE].start = cmd_line;
|
||||
mem_avoid[MEM_AVOID_CMDLINE].size = cmd_line_size;
|
||||
add_identity_map(mem_avoid[MEM_AVOID_CMDLINE].start,
|
||||
mem_avoid[MEM_AVOID_CMDLINE].size);
|
||||
|
||||
/* Avoid boot parameters. */
|
||||
mem_avoid[MEM_AVOID_BOOTPARAMS].start = (unsigned long)boot_params;
|
||||
mem_avoid[MEM_AVOID_BOOTPARAMS].size = sizeof(*boot_params);
|
||||
add_identity_map(mem_avoid[MEM_AVOID_BOOTPARAMS].start,
|
||||
mem_avoid[MEM_AVOID_BOOTPARAMS].size);
|
||||
|
||||
/* We don't need to set a mapping for setup_data. */
|
||||
|
||||
#ifdef CONFIG_X86_VERBOSE_BOOTUP
|
||||
/* Make sure video RAM can be used. */
|
||||
add_identity_map(0, PMD_SIZE);
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* Does this memory vector overlap a known avoided area? If so, record the
|
||||
* overlap region with the lowest address.
|
||||
*/
|
||||
static bool mem_avoid_overlap(struct mem_vector *img,
|
||||
struct mem_vector *overlap)
|
||||
{
|
||||
int i;
|
||||
struct setup_data *ptr;
|
||||
unsigned long earliest = img->start + img->size;
|
||||
bool is_overlapping = false;
|
||||
|
||||
for (i = 0; i < MEM_AVOID_MAX; i++) {
|
||||
if (mem_overlaps(img, &mem_avoid[i]) &&
|
||||
mem_avoid[i].start < earliest) {
|
||||
*overlap = mem_avoid[i];
|
||||
is_overlapping = true;
|
||||
}
|
||||
}
|
||||
|
||||
/* Avoid all entries in the setup_data linked list. */
|
||||
ptr = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
|
||||
while (ptr) {
|
||||
struct mem_vector avoid;
|
||||
|
||||
avoid.start = (unsigned long)ptr;
|
||||
avoid.size = sizeof(*ptr) + ptr->len;
|
||||
|
||||
if (mem_overlaps(img, &avoid) && (avoid.start < earliest)) {
|
||||
*overlap = avoid;
|
||||
is_overlapping = true;
|
||||
}
|
||||
|
||||
ptr = (struct setup_data *)(unsigned long)ptr->next;
|
||||
}
|
||||
|
||||
return is_overlapping;
|
||||
}
|
||||
|
||||
static unsigned long slots[KERNEL_IMAGE_SIZE / CONFIG_PHYSICAL_ALIGN];
|
||||
|
||||
struct slot_area {
|
||||
unsigned long addr;
|
||||
int num;
|
||||
};
|
||||
|
||||
#define MAX_SLOT_AREA 100
|
||||
|
||||
static struct slot_area slot_areas[MAX_SLOT_AREA];
|
||||
|
||||
static unsigned long slot_max;
|
||||
|
||||
static unsigned long slot_area_index;
|
||||
|
||||
static void store_slot_info(struct mem_vector *region, unsigned long image_size)
|
||||
{
|
||||
struct slot_area slot_area;
|
||||
|
||||
if (slot_area_index == MAX_SLOT_AREA)
|
||||
return;
|
||||
|
||||
slot_area.addr = region->start;
|
||||
slot_area.num = (region->size - image_size) /
|
||||
CONFIG_PHYSICAL_ALIGN + 1;
|
||||
|
||||
if (slot_area.num > 0) {
|
||||
slot_areas[slot_area_index++] = slot_area;
|
||||
slot_max += slot_area.num;
|
||||
}
|
||||
}
|
||||
|
||||
static void slots_append(unsigned long addr)
|
||||
{
|
||||
/* Overflowing the slots list should be impossible. */
|
||||
if (slot_max >= KERNEL_IMAGE_SIZE / CONFIG_PHYSICAL_ALIGN)
|
||||
return;
|
||||
|
||||
slots[slot_max++] = addr;
|
||||
}
|
||||
|
||||
static unsigned long slots_fetch_random(void)
|
||||
{
|
||||
/* Handle case of no slots stored. */
|
||||
if (slot_max == 0)
|
||||
return 0;
|
||||
|
||||
return slots[get_random_long("Physical") % slot_max];
|
||||
}
|
||||
|
||||
static void process_e820_entry(struct e820entry *entry,
|
||||
unsigned long minimum,
|
||||
unsigned long image_size)
|
||||
{
|
||||
struct mem_vector region, img, overlap;
|
||||
|
||||
/* Skip non-RAM entries. */
|
||||
if (entry->type != E820_RAM)
|
||||
return;
|
||||
|
||||
/* Ignore entries entirely above our maximum. */
|
||||
if (entry->addr >= KERNEL_IMAGE_SIZE)
|
||||
return;
|
||||
|
||||
/* Ignore entries entirely below our minimum. */
|
||||
if (entry->addr + entry->size < minimum)
|
||||
return;
|
||||
|
||||
region.start = entry->addr;
|
||||
region.size = entry->size;
|
||||
|
||||
/* Potentially raise address to minimum location. */
|
||||
if (region.start < minimum)
|
||||
region.start = minimum;
|
||||
|
||||
/* Potentially raise address to meet alignment requirements. */
|
||||
region.start = ALIGN(region.start, CONFIG_PHYSICAL_ALIGN);
|
||||
|
||||
/* Did we raise the address above the bounds of this e820 region? */
|
||||
if (region.start > entry->addr + entry->size)
|
||||
return;
|
||||
|
||||
/* Reduce size by any delta from the original address. */
|
||||
region.size -= region.start - entry->addr;
|
||||
|
||||
/* Reduce maximum size to fit end of image within maximum limit. */
|
||||
if (region.start + region.size > KERNEL_IMAGE_SIZE)
|
||||
region.size = KERNEL_IMAGE_SIZE - region.start;
|
||||
|
||||
/* Walk each aligned slot and check for avoided areas. */
|
||||
for (img.start = region.start, img.size = image_size ;
|
||||
mem_contains(®ion, &img) ;
|
||||
img.start += CONFIG_PHYSICAL_ALIGN) {
|
||||
if (mem_avoid_overlap(&img, &overlap))
|
||||
continue;
|
||||
slots_append(img.start);
|
||||
}
|
||||
}
|
||||
|
||||
static unsigned long find_random_phys_addr(unsigned long minimum,
|
||||
unsigned long image_size)
|
||||
{
|
||||
int i;
|
||||
unsigned long addr;
|
||||
|
||||
/* Make sure minimum is aligned. */
|
||||
minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN);
|
||||
|
||||
/* Verify potential e820 positions, appending to slots list. */
|
||||
for (i = 0; i < boot_params->e820_entries; i++) {
|
||||
process_e820_entry(&boot_params->e820_map[i], minimum,
|
||||
image_size);
|
||||
}
|
||||
|
||||
return slots_fetch_random();
|
||||
}
|
||||
|
||||
static unsigned long find_random_virt_addr(unsigned long minimum,
|
||||
unsigned long image_size)
|
||||
{
|
||||
unsigned long slots, random_addr;
|
||||
|
||||
/* Make sure minimum is aligned. */
|
||||
minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN);
|
||||
/* Align image_size for easy slot calculations. */
|
||||
image_size = ALIGN(image_size, CONFIG_PHYSICAL_ALIGN);
|
||||
|
||||
/*
|
||||
* There are how many CONFIG_PHYSICAL_ALIGN-sized slots
|
||||
* that can hold image_size within the range of minimum to
|
||||
* KERNEL_IMAGE_SIZE?
|
||||
*/
|
||||
slots = (KERNEL_IMAGE_SIZE - minimum - image_size) /
|
||||
CONFIG_PHYSICAL_ALIGN + 1;
|
||||
|
||||
random_addr = get_random_long("Virtual") % slots;
|
||||
|
||||
return random_addr * CONFIG_PHYSICAL_ALIGN + minimum;
|
||||
}
|
||||
|
||||
/*
|
||||
* Since this function examines addresses much more numerically,
|
||||
* it takes the input and output pointers as 'unsigned long'.
|
||||
*/
|
||||
unsigned char *choose_random_location(unsigned long input,
|
||||
unsigned long input_size,
|
||||
unsigned long output,
|
||||
unsigned long output_size)
|
||||
{
|
||||
unsigned long choice = output;
|
||||
unsigned long random_addr;
|
||||
|
||||
#ifdef CONFIG_HIBERNATION
|
||||
if (!cmdline_find_option_bool("kaslr")) {
|
||||
warn("KASLR disabled: 'kaslr' not on cmdline (hibernation selected).");
|
||||
goto out;
|
||||
}
|
||||
#else
|
||||
if (cmdline_find_option_bool("nokaslr")) {
|
||||
warn("KASLR disabled: 'nokaslr' on cmdline.");
|
||||
goto out;
|
||||
}
|
||||
#endif
|
||||
|
||||
boot_params->hdr.loadflags |= KASLR_FLAG;
|
||||
|
||||
/* Record the various known unsafe memory ranges. */
|
||||
mem_avoid_init(input, input_size, output);
|
||||
|
||||
/* Walk e820 and find a random address. */
|
||||
random_addr = find_random_phys_addr(output, output_size);
|
||||
if (!random_addr) {
|
||||
warn("KASLR disabled: could not find suitable E820 region!");
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Always enforce the minimum. */
|
||||
if (random_addr < choice)
|
||||
goto out;
|
||||
|
||||
choice = random_addr;
|
||||
|
||||
add_identity_map(choice, output_size);
|
||||
|
||||
/* This actually loads the identity pagetable on x86_64. */
|
||||
finalize_identity_maps();
|
||||
out:
|
||||
return (unsigned char *)choice;
|
||||
}
|
||||
|
|
@ -1,8 +1,10 @@
|
|||
/*
|
||||
* misc.c
|
||||
*
|
||||
* This is a collection of several routines from gzip-1.0.3
|
||||
* adapted for Linux.
|
||||
* This is a collection of several routines used to extract the kernel
|
||||
* which includes KASLR relocation, decompression, ELF parsing, and
|
||||
* relocation processing. Additionally included are the screen and serial
|
||||
* output functions and related debugging support functions.
|
||||
*
|
||||
* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
|
||||
* puts by Nick Holloway 1993, better puts by Martin Mares 1995
|
||||
|
|
@ -10,111 +12,37 @@
|
|||
*/
|
||||
|
||||
#include "misc.h"
|
||||
#include "error.h"
|
||||
#include "../string.h"
|
||||
|
||||
/* WARNING!!
|
||||
* This code is compiled with -fPIC and it is relocated dynamically
|
||||
* at run time, but no relocation processing is performed.
|
||||
* This means that it is not safe to place pointers in static structures.
|
||||
*/
|
||||
#include "../voffset.h"
|
||||
|
||||
/*
|
||||
* Getting to provable safe in place decompression is hard.
|
||||
* Worst case behaviours need to be analyzed.
|
||||
* Background information:
|
||||
*
|
||||
* The file layout is:
|
||||
* magic[2]
|
||||
* method[1]
|
||||
* flags[1]
|
||||
* timestamp[4]
|
||||
* extraflags[1]
|
||||
* os[1]
|
||||
* compressed data blocks[N]
|
||||
* crc[4] orig_len[4]
|
||||
*
|
||||
* resulting in 18 bytes of non compressed data overhead.
|
||||
*
|
||||
* Files divided into blocks
|
||||
* 1 bit (last block flag)
|
||||
* 2 bits (block type)
|
||||
*
|
||||
* 1 block occurs every 32K -1 bytes or when there 50% compression
|
||||
* has been achieved. The smallest block type encoding is always used.
|
||||
*
|
||||
* stored:
|
||||
* 32 bits length in bytes.
|
||||
*
|
||||
* fixed:
|
||||
* magic fixed tree.
|
||||
* symbols.
|
||||
*
|
||||
* dynamic:
|
||||
* dynamic tree encoding.
|
||||
* symbols.
|
||||
*
|
||||
*
|
||||
* The buffer for decompression in place is the length of the
|
||||
* uncompressed data, plus a small amount extra to keep the algorithm safe.
|
||||
* The compressed data is placed at the end of the buffer. The output
|
||||
* pointer is placed at the start of the buffer and the input pointer
|
||||
* is placed where the compressed data starts. Problems will occur
|
||||
* when the output pointer overruns the input pointer.
|
||||
*
|
||||
* The output pointer can only overrun the input pointer if the input
|
||||
* pointer is moving faster than the output pointer. A condition only
|
||||
* triggered by data whose compressed form is larger than the uncompressed
|
||||
* form.
|
||||
*
|
||||
* The worst case at the block level is a growth of the compressed data
|
||||
* of 5 bytes per 32767 bytes.
|
||||
*
|
||||
* The worst case internal to a compressed block is very hard to figure.
|
||||
* The worst case can at least be boundined by having one bit that represents
|
||||
* 32764 bytes and then all of the rest of the bytes representing the very
|
||||
* very last byte.
|
||||
*
|
||||
* All of which is enough to compute an amount of extra data that is required
|
||||
* to be safe. To avoid problems at the block level allocating 5 extra bytes
|
||||
* per 32767 bytes of data is sufficient. To avoind problems internal to a
|
||||
* block adding an extra 32767 bytes (the worst case uncompressed block size)
|
||||
* is sufficient, to ensure that in the worst case the decompressed data for
|
||||
* block will stop the byte before the compressed data for a block begins.
|
||||
* To avoid problems with the compressed data's meta information an extra 18
|
||||
* bytes are needed. Leading to the formula:
|
||||
*
|
||||
* extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
|
||||
*
|
||||
* Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
|
||||
* Adding 32768 instead of 32767 just makes for round numbers.
|
||||
* Adding the decompressor_size is necessary as it musht live after all
|
||||
* of the data as well. Last I measured the decompressor is about 14K.
|
||||
* 10K of actual data and 4K of bss.
|
||||
*
|
||||
* WARNING!!
|
||||
* This code is compiled with -fPIC and it is relocated dynamically at
|
||||
* run time, but no relocation processing is performed. This means that
|
||||
* it is not safe to place pointers in static structures.
|
||||
*/
|
||||
|
||||
/*
|
||||
* gzip declarations
|
||||
*/
|
||||
/* Macros used by the included decompressor code below. */
|
||||
#define STATIC static
|
||||
|
||||
#undef memcpy
|
||||
|
||||
/*
|
||||
* Use a normal definition of memset() from string.c. There are already
|
||||
* Use normal definitions of mem*() from string.c. There are already
|
||||
* included header files which expect a definition of memset() and by
|
||||
* the time we define memset macro, it is too late.
|
||||
*/
|
||||
#undef memcpy
|
||||
#undef memset
|
||||
#define memzero(s, n) memset((s), 0, (n))
|
||||
#define memmove memmove
|
||||
|
||||
|
||||
static void error(char *m);
|
||||
/* Functions used by the included decompressor code below. */
|
||||
void *memmove(void *dest, const void *src, size_t n);
|
||||
|
||||
/*
|
||||
* This is set up by the setup-routine at boot-time
|
||||
*/
|
||||
struct boot_params *real_mode; /* Pointer to real-mode data */
|
||||
struct boot_params *boot_params;
|
||||
|
||||
memptr free_mem_ptr;
|
||||
memptr free_mem_end_ptr;
|
||||
|
|
@ -146,12 +74,16 @@ static int lines, cols;
|
|||
#ifdef CONFIG_KERNEL_LZ4
|
||||
#include "../../../../lib/decompress_unlz4.c"
|
||||
#endif
|
||||
/*
|
||||
* NOTE: When adding a new decompressor, please update the analysis in
|
||||
* ../header.S.
|
||||
*/
|
||||
|
||||
static void scroll(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
|
||||
memmove(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
|
||||
for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
|
||||
vidmem[i] = ' ';
|
||||
}
|
||||
|
|
@ -184,12 +116,12 @@ void __putstr(const char *s)
|
|||
}
|
||||
}
|
||||
|
||||
if (real_mode->screen_info.orig_video_mode == 0 &&
|
||||
if (boot_params->screen_info.orig_video_mode == 0 &&
|
||||
lines == 0 && cols == 0)
|
||||
return;
|
||||
|
||||
x = real_mode->screen_info.orig_x;
|
||||
y = real_mode->screen_info.orig_y;
|
||||
x = boot_params->screen_info.orig_x;
|
||||
y = boot_params->screen_info.orig_y;
|
||||
|
||||
while ((c = *s++) != '\0') {
|
||||
if (c == '\n') {
|
||||
|
|
@ -210,8 +142,8 @@ void __putstr(const char *s)
|
|||
}
|
||||
}
|
||||
|
||||
real_mode->screen_info.orig_x = x;
|
||||
real_mode->screen_info.orig_y = y;
|
||||
boot_params->screen_info.orig_x = x;
|
||||
boot_params->screen_info.orig_y = y;
|
||||
|
||||
pos = (x + cols * y) * 2; /* Update cursor position */
|
||||
outb(14, vidport);
|
||||
|
|
@ -237,23 +169,13 @@ void __puthex(unsigned long value)
|
|||
}
|
||||
}
|
||||
|
||||
static void error(char *x)
|
||||
{
|
||||
error_putstr("\n\n");
|
||||
error_putstr(x);
|
||||
error_putstr("\n\n -- System halted");
|
||||
|
||||
while (1)
|
||||
asm("hlt");
|
||||
}
|
||||
|
||||
#if CONFIG_X86_NEED_RELOCS
|
||||
static void handle_relocations(void *output, unsigned long output_len)
|
||||
{
|
||||
int *reloc;
|
||||
unsigned long delta, map, ptr;
|
||||
unsigned long min_addr = (unsigned long)output;
|
||||
unsigned long max_addr = min_addr + output_len;
|
||||
unsigned long max_addr = min_addr + (VO___bss_start - VO__text);
|
||||
|
||||
/*
|
||||
* Calculate the delta between where vmlinux was linked to load
|
||||
|
|
@ -295,7 +217,7 @@ static void handle_relocations(void *output, unsigned long output_len)
|
|||
* So we work backwards from the end of the decompressed image.
|
||||
*/
|
||||
for (reloc = output + output_len - sizeof(*reloc); *reloc; reloc--) {
|
||||
int extended = *reloc;
|
||||
long extended = *reloc;
|
||||
extended += map;
|
||||
|
||||
ptr = (unsigned long)extended;
|
||||
|
|
@ -372,9 +294,7 @@ static void parse_elf(void *output)
|
|||
#else
|
||||
dest = (void *)(phdr->p_paddr);
|
||||
#endif
|
||||
memcpy(dest,
|
||||
output + phdr->p_offset,
|
||||
phdr->p_filesz);
|
||||
memmove(dest, output + phdr->p_offset, phdr->p_filesz);
|
||||
break;
|
||||
default: /* Ignore other PT_* */ break;
|
||||
}
|
||||
|
|
@ -383,23 +303,41 @@ static void parse_elf(void *output)
|
|||
free(phdrs);
|
||||
}
|
||||
|
||||
asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
|
||||
/*
|
||||
* The compressed kernel image (ZO), has been moved so that its position
|
||||
* is against the end of the buffer used to hold the uncompressed kernel
|
||||
* image (VO) and the execution environment (.bss, .brk), which makes sure
|
||||
* there is room to do the in-place decompression. (See header.S for the
|
||||
* calculations.)
|
||||
*
|
||||
* |-----compressed kernel image------|
|
||||
* V V
|
||||
* 0 extract_offset +INIT_SIZE
|
||||
* |-----------|---------------|-------------------------|--------|
|
||||
* | | | |
|
||||
* VO__text startup_32 of ZO VO__end ZO__end
|
||||
* ^ ^
|
||||
* |-------uncompressed kernel image---------|
|
||||
*
|
||||
*/
|
||||
asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
|
||||
unsigned char *input_data,
|
||||
unsigned long input_len,
|
||||
unsigned char *output,
|
||||
unsigned long output_len,
|
||||
unsigned long run_size)
|
||||
unsigned long output_len)
|
||||
{
|
||||
const unsigned long kernel_total_size = VO__end - VO__text;
|
||||
unsigned char *output_orig = output;
|
||||
|
||||
real_mode = rmode;
|
||||
/* Retain x86 boot parameters pointer passed from startup_32/64. */
|
||||
boot_params = rmode;
|
||||
|
||||
/* Clear it for solely in-kernel use */
|
||||
real_mode->hdr.loadflags &= ~KASLR_FLAG;
|
||||
/* Clear flags intended for solely in-kernel use. */
|
||||
boot_params->hdr.loadflags &= ~KASLR_FLAG;
|
||||
|
||||
sanitize_boot_params(real_mode);
|
||||
sanitize_boot_params(boot_params);
|
||||
|
||||
if (real_mode->screen_info.orig_video_mode == 7) {
|
||||
if (boot_params->screen_info.orig_video_mode == 7) {
|
||||
vidmem = (char *) 0xb0000;
|
||||
vidport = 0x3b4;
|
||||
} else {
|
||||
|
|
@ -407,11 +345,11 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
|
|||
vidport = 0x3d4;
|
||||
}
|
||||
|
||||
lines = real_mode->screen_info.orig_video_lines;
|
||||
cols = real_mode->screen_info.orig_video_cols;
|
||||
lines = boot_params->screen_info.orig_video_lines;
|
||||
cols = boot_params->screen_info.orig_video_cols;
|
||||
|
||||
console_init();
|
||||
debug_putstr("early console in decompress_kernel\n");
|
||||
debug_putstr("early console in extract_kernel\n");
|
||||
|
||||
free_mem_ptr = heap; /* Heap */
|
||||
free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
|
||||
|
|
@ -421,16 +359,16 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
|
|||
debug_putaddr(input_len);
|
||||
debug_putaddr(output);
|
||||
debug_putaddr(output_len);
|
||||
debug_putaddr(run_size);
|
||||
debug_putaddr(kernel_total_size);
|
||||
|
||||
/*
|
||||
* The memory hole needed for the kernel is the larger of either
|
||||
* the entire decompressed kernel plus relocation table, or the
|
||||
* entire decompressed kernel plus .bss and .brk sections.
|
||||
*/
|
||||
output = choose_kernel_location(real_mode, input_data, input_len, output,
|
||||
output_len > run_size ? output_len
|
||||
: run_size);
|
||||
output = choose_random_location((unsigned long)input_data, input_len,
|
||||
(unsigned long)output,
|
||||
max(output_len, kernel_total_size));
|
||||
|
||||
/* Validate memory location choices. */
|
||||
if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
|
||||
|
|
|
|||
|
|
@ -32,7 +32,7 @@
|
|||
/* misc.c */
|
||||
extern memptr free_mem_ptr;
|
||||
extern memptr free_mem_end_ptr;
|
||||
extern struct boot_params *real_mode; /* Pointer to real-mode data */
|
||||
extern struct boot_params *boot_params;
|
||||
void __putstr(const char *s);
|
||||
void __puthex(unsigned long value);
|
||||
#define error_putstr(__x) __putstr(__x)
|
||||
|
|
@ -66,26 +66,35 @@ int cmdline_find_option_bool(const char *option);
|
|||
|
||||
|
||||
#if CONFIG_RANDOMIZE_BASE
|
||||
/* aslr.c */
|
||||
unsigned char *choose_kernel_location(struct boot_params *boot_params,
|
||||
unsigned char *input,
|
||||
/* kaslr.c */
|
||||
unsigned char *choose_random_location(unsigned long input_ptr,
|
||||
unsigned long input_size,
|
||||
unsigned char *output,
|
||||
unsigned long output_ptr,
|
||||
unsigned long output_size);
|
||||
/* cpuflags.c */
|
||||
bool has_cpuflag(int flag);
|
||||
#else
|
||||
static inline
|
||||
unsigned char *choose_kernel_location(struct boot_params *boot_params,
|
||||
unsigned char *input,
|
||||
unsigned char *choose_random_location(unsigned long input_ptr,
|
||||
unsigned long input_size,
|
||||
unsigned char *output,
|
||||
unsigned long output_ptr,
|
||||
unsigned long output_size)
|
||||
{
|
||||
return output;
|
||||
return (unsigned char *)output_ptr;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
void add_identity_map(unsigned long start, unsigned long size);
|
||||
void finalize_identity_maps(void);
|
||||
extern unsigned char _pgtable[];
|
||||
#else
|
||||
static inline void add_identity_map(unsigned long start, unsigned long size)
|
||||
{ }
|
||||
static inline void finalize_identity_maps(void)
|
||||
{ }
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_EARLY_PRINTK
|
||||
/* early_serial_console.c */
|
||||
extern int early_serial_base;
|
||||
|
|
|
|||
|
|
@ -18,11 +18,10 @@
|
|||
*
|
||||
* H. Peter Anvin <hpa@linux.intel.com>
|
||||
*
|
||||
* ----------------------------------------------------------------------- */
|
||||
|
||||
/*
|
||||
* Compute the desired load offset from a compressed program; outputs
|
||||
* a small assembly wrapper with the appropriate symbols defined.
|
||||
* -----------------------------------------------------------------------
|
||||
*
|
||||
* Outputs a small assembly wrapper with the appropriate symbols defined.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <stdlib.h>
|
||||
|
|
@ -35,14 +34,11 @@ int main(int argc, char *argv[])
|
|||
{
|
||||
uint32_t olen;
|
||||
long ilen;
|
||||
unsigned long offs;
|
||||
unsigned long run_size;
|
||||
FILE *f = NULL;
|
||||
int retval = 1;
|
||||
|
||||
if (argc < 3) {
|
||||
fprintf(stderr, "Usage: %s compressed_file run_size\n",
|
||||
argv[0]);
|
||||
if (argc < 2) {
|
||||
fprintf(stderr, "Usage: %s compressed_file\n", argv[0]);
|
||||
goto bail;
|
||||
}
|
||||
|
||||
|
|
@ -67,29 +63,11 @@ int main(int argc, char *argv[])
|
|||
ilen = ftell(f);
|
||||
olen = get_unaligned_le32(&olen);
|
||||
|
||||
/*
|
||||
* Now we have the input (compressed) and output (uncompressed)
|
||||
* sizes, compute the necessary decompression offset...
|
||||
*/
|
||||
|
||||
offs = (olen > ilen) ? olen - ilen : 0;
|
||||
offs += olen >> 12; /* Add 8 bytes for each 32K block */
|
||||
offs += 64*1024 + 128; /* Add 64K + 128 bytes slack */
|
||||
offs = (offs+4095) & ~4095; /* Round to a 4K boundary */
|
||||
run_size = atoi(argv[2]);
|
||||
|
||||
printf(".section \".rodata..compressed\",\"a\",@progbits\n");
|
||||
printf(".globl z_input_len\n");
|
||||
printf("z_input_len = %lu\n", ilen);
|
||||
printf(".globl z_output_len\n");
|
||||
printf("z_output_len = %lu\n", (unsigned long)olen);
|
||||
printf(".globl z_extract_offset\n");
|
||||
printf("z_extract_offset = 0x%lx\n", offs);
|
||||
/* z_extract_offset_negative allows simplification of head_32.S */
|
||||
printf(".globl z_extract_offset_negative\n");
|
||||
printf("z_extract_offset_negative = -0x%lx\n", offs);
|
||||
printf(".globl z_run_size\n");
|
||||
printf("z_run_size = %lu\n", run_size);
|
||||
|
||||
printf(".globl input_data, input_data_end\n");
|
||||
printf("input_data:\n");
|
||||
|
|
|
|||
|
|
@ -0,0 +1,129 @@
|
|||
/*
|
||||
* This code is used on x86_64 to create page table identity mappings on
|
||||
* demand by building up a new set of page tables (or appending to the
|
||||
* existing ones), and then switching over to them when ready.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Since we're dealing with identity mappings, physical and virtual
|
||||
* addresses are the same, so override these defines which are ultimately
|
||||
* used by the headers in misc.h.
|
||||
*/
|
||||
#define __pa(x) ((unsigned long)(x))
|
||||
#define __va(x) ((void *)((unsigned long)(x)))
|
||||
|
||||
#include "misc.h"
|
||||
|
||||
/* These actually do the work of building the kernel identity maps. */
|
||||
#include <asm/init.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include "../../mm/ident_map.c"
|
||||
|
||||
/* Used by pgtable.h asm code to force instruction serialization. */
|
||||
unsigned long __force_order;
|
||||
|
||||
/* Used to track our page table allocation area. */
|
||||
struct alloc_pgt_data {
|
||||
unsigned char *pgt_buf;
|
||||
unsigned long pgt_buf_size;
|
||||
unsigned long pgt_buf_offset;
|
||||
};
|
||||
|
||||
/*
|
||||
* Allocates space for a page table entry, using struct alloc_pgt_data
|
||||
* above. Besides the local callers, this is used as the allocation
|
||||
* callback in mapping_info below.
|
||||
*/
|
||||
static void *alloc_pgt_page(void *context)
|
||||
{
|
||||
struct alloc_pgt_data *pages = (struct alloc_pgt_data *)context;
|
||||
unsigned char *entry;
|
||||
|
||||
/* Validate there is space available for a new page. */
|
||||
if (pages->pgt_buf_offset >= pages->pgt_buf_size) {
|
||||
debug_putstr("out of pgt_buf in " __FILE__ "!?\n");
|
||||
debug_putaddr(pages->pgt_buf_offset);
|
||||
debug_putaddr(pages->pgt_buf_size);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
entry = pages->pgt_buf + pages->pgt_buf_offset;
|
||||
pages->pgt_buf_offset += PAGE_SIZE;
|
||||
|
||||
return entry;
|
||||
}
|
||||
|
||||
/* Used to track our allocated page tables. */
|
||||
static struct alloc_pgt_data pgt_data;
|
||||
|
||||
/* The top level page table entry pointer. */
|
||||
static unsigned long level4p;
|
||||
|
||||
/* Locates and clears a region for a new top level page table. */
|
||||
static void prepare_level4(void)
|
||||
{
|
||||
/*
|
||||
* It should be impossible for this not to already be true,
|
||||
* but since calling this a second time would rewind the other
|
||||
* counters, let's just make sure this is reset too.
|
||||
*/
|
||||
pgt_data.pgt_buf_offset = 0;
|
||||
|
||||
/*
|
||||
* If we came here via startup_32(), cr3 will be _pgtable already
|
||||
* and we must append to the existing area instead of entirely
|
||||
* overwriting it.
|
||||
*/
|
||||
level4p = read_cr3();
|
||||
if (level4p == (unsigned long)_pgtable) {
|
||||
debug_putstr("booted via startup_32()\n");
|
||||
pgt_data.pgt_buf = _pgtable + BOOT_INIT_PGT_SIZE;
|
||||
pgt_data.pgt_buf_size = BOOT_PGT_SIZE - BOOT_INIT_PGT_SIZE;
|
||||
memset(pgt_data.pgt_buf, 0, pgt_data.pgt_buf_size);
|
||||
} else {
|
||||
debug_putstr("booted via startup_64()\n");
|
||||
pgt_data.pgt_buf = _pgtable;
|
||||
pgt_data.pgt_buf_size = BOOT_PGT_SIZE;
|
||||
memset(pgt_data.pgt_buf, 0, pgt_data.pgt_buf_size);
|
||||
level4p = (unsigned long)alloc_pgt_page(&pgt_data);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Adds the specified range to what will become the new identity mappings.
|
||||
* Once all ranges have been added, the new mapping is activated by calling
|
||||
* finalize_identity_maps() below.
|
||||
*/
|
||||
void add_identity_map(unsigned long start, unsigned long size)
|
||||
{
|
||||
struct x86_mapping_info mapping_info = {
|
||||
.alloc_pgt_page = alloc_pgt_page,
|
||||
.context = &pgt_data,
|
||||
.pmd_flag = __PAGE_KERNEL_LARGE_EXEC,
|
||||
};
|
||||
unsigned long end = start + size;
|
||||
|
||||
/* Make sure we have a top level page table ready to use. */
|
||||
if (!level4p)
|
||||
prepare_level4();
|
||||
|
||||
/* Align boundary to 2M. */
|
||||
start = round_down(start, PMD_SIZE);
|
||||
end = round_up(end, PMD_SIZE);
|
||||
if (start >= end)
|
||||
return;
|
||||
|
||||
/* Build the mapping. */
|
||||
kernel_ident_mapping_init(&mapping_info, (pgd_t *)level4p,
|
||||
start, end);
|
||||
}
|
||||
|
||||
/*
|
||||
* This switches the page tables to the new level4 that has been built
|
||||
* via calls to add_identity_map() above. If booted via startup_32(),
|
||||
* this is effectively a no-op.
|
||||
*/
|
||||
void finalize_identity_maps(void)
|
||||
{
|
||||
write_cr3(level4p);
|
||||
}
|
||||
|
|
@ -1,7 +1,16 @@
|
|||
/*
|
||||
* This provides an optimized implementation of memcpy, and a simplified
|
||||
* implementation of memset and memmove. These are used here because the
|
||||
* standard kernel runtime versions are not yet available and we don't
|
||||
* trust the gcc built-in implementations as they may do unexpected things
|
||||
* (e.g. FPU ops) in the minimal decompression stub execution environment.
|
||||
*/
|
||||
#include "error.h"
|
||||
|
||||
#include "../string.c"
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
void *memcpy(void *dest, const void *src, size_t n)
|
||||
static void *__memcpy(void *dest, const void *src, size_t n)
|
||||
{
|
||||
int d0, d1, d2;
|
||||
asm volatile(
|
||||
|
|
@ -15,7 +24,7 @@ void *memcpy(void *dest, const void *src, size_t n)
|
|||
return dest;
|
||||
}
|
||||
#else
|
||||
void *memcpy(void *dest, const void *src, size_t n)
|
||||
static void *__memcpy(void *dest, const void *src, size_t n)
|
||||
{
|
||||
long d0, d1, d2;
|
||||
asm volatile(
|
||||
|
|
@ -39,3 +48,27 @@ void *memset(void *s, int c, size_t n)
|
|||
ss[i] = c;
|
||||
return s;
|
||||
}
|
||||
|
||||
void *memmove(void *dest, const void *src, size_t n)
|
||||
{
|
||||
unsigned char *d = dest;
|
||||
const unsigned char *s = src;
|
||||
|
||||
if (d <= s || d - s >= n)
|
||||
return __memcpy(dest, src, n);
|
||||
|
||||
while (n-- > 0)
|
||||
d[n] = s[n];
|
||||
|
||||
return dest;
|
||||
}
|
||||
|
||||
/* Detect and warn about potential overlaps, but handle them with memmove. */
|
||||
void *memcpy(void *dest, const void *src, size_t n)
|
||||
{
|
||||
if (dest > src && dest - src < n) {
|
||||
warn("Avoiding potentially unsafe overlapping memcpy()!");
|
||||
return memmove(dest, src, n);
|
||||
}
|
||||
return __memcpy(dest, src, n);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -70,5 +70,6 @@ SECTIONS
|
|||
_epgtable = . ;
|
||||
}
|
||||
#endif
|
||||
. = ALIGN(PAGE_SIZE); /* keep ZO size page aligned */
|
||||
_end = .;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,3 +1,7 @@
|
|||
/*
|
||||
* Serial port routines for use during early boot reporting. This code is
|
||||
* included from both the compressed kernel and the regular kernel.
|
||||
*/
|
||||
#include "boot.h"
|
||||
|
||||
#define DEFAULT_SERIAL_PORT 0x3f8 /* ttyS0 */
|
||||
|
|
|
|||
|
|
@ -440,13 +440,116 @@ setup_data: .quad 0 # 64-bit physical pointer to
|
|||
|
||||
pref_address: .quad LOAD_PHYSICAL_ADDR # preferred load addr
|
||||
|
||||
#define ZO_INIT_SIZE (ZO__end - ZO_startup_32 + ZO_z_extract_offset)
|
||||
#
|
||||
# Getting to provably safe in-place decompression is hard. Worst case
|
||||
# behaviours need to be analyzed. Here let's take the decompression of
|
||||
# a gzip-compressed kernel as example, to illustrate it:
|
||||
#
|
||||
# The file layout of gzip compressed kernel is:
|
||||
#
|
||||
# magic[2]
|
||||
# method[1]
|
||||
# flags[1]
|
||||
# timestamp[4]
|
||||
# extraflags[1]
|
||||
# os[1]
|
||||
# compressed data blocks[N]
|
||||
# crc[4] orig_len[4]
|
||||
#
|
||||
# ... resulting in +18 bytes overhead of uncompressed data.
|
||||
#
|
||||
# (For more information, please refer to RFC 1951 and RFC 1952.)
|
||||
#
|
||||
# Files divided into blocks
|
||||
# 1 bit (last block flag)
|
||||
# 2 bits (block type)
|
||||
#
|
||||
# 1 block occurs every 32K -1 bytes or when there 50% compression
|
||||
# has been achieved. The smallest block type encoding is always used.
|
||||
#
|
||||
# stored:
|
||||
# 32 bits length in bytes.
|
||||
#
|
||||
# fixed:
|
||||
# magic fixed tree.
|
||||
# symbols.
|
||||
#
|
||||
# dynamic:
|
||||
# dynamic tree encoding.
|
||||
# symbols.
|
||||
#
|
||||
#
|
||||
# The buffer for decompression in place is the length of the uncompressed
|
||||
# data, plus a small amount extra to keep the algorithm safe. The
|
||||
# compressed data is placed at the end of the buffer. The output pointer
|
||||
# is placed at the start of the buffer and the input pointer is placed
|
||||
# where the compressed data starts. Problems will occur when the output
|
||||
# pointer overruns the input pointer.
|
||||
#
|
||||
# The output pointer can only overrun the input pointer if the input
|
||||
# pointer is moving faster than the output pointer. A condition only
|
||||
# triggered by data whose compressed form is larger than the uncompressed
|
||||
# form.
|
||||
#
|
||||
# The worst case at the block level is a growth of the compressed data
|
||||
# of 5 bytes per 32767 bytes.
|
||||
#
|
||||
# The worst case internal to a compressed block is very hard to figure.
|
||||
# The worst case can at least be bounded by having one bit that represents
|
||||
# 32764 bytes and then all of the rest of the bytes representing the very
|
||||
# very last byte.
|
||||
#
|
||||
# All of which is enough to compute an amount of extra data that is required
|
||||
# to be safe. To avoid problems at the block level allocating 5 extra bytes
|
||||
# per 32767 bytes of data is sufficient. To avoid problems internal to a
|
||||
# block adding an extra 32767 bytes (the worst case uncompressed block size)
|
||||
# is sufficient, to ensure that in the worst case the decompressed data for
|
||||
# block will stop the byte before the compressed data for a block begins.
|
||||
# To avoid problems with the compressed data's meta information an extra 18
|
||||
# bytes are needed. Leading to the formula:
|
||||
#
|
||||
# extra_bytes = (uncompressed_size >> 12) + 32768 + 18
|
||||
#
|
||||
# Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
|
||||
# Adding 32768 instead of 32767 just makes for round numbers.
|
||||
#
|
||||
# Above analysis is for decompressing gzip compressed kernel only. Up to
|
||||
# now 6 different decompressor are supported all together. And among them
|
||||
# xz stores data in chunks and has maximum chunk of 64K. Hence safety
|
||||
# margin should be updated to cover all decompressors so that we don't
|
||||
# need to deal with each of them separately. Please check
|
||||
# the description in lib/decompressor_xxx.c for specific information.
|
||||
#
|
||||
# extra_bytes = (uncompressed_size >> 12) + 65536 + 128
|
||||
|
||||
#define ZO_z_extra_bytes ((ZO_z_output_len >> 12) + 65536 + 128)
|
||||
#if ZO_z_output_len > ZO_z_input_len
|
||||
# define ZO_z_extract_offset (ZO_z_output_len + ZO_z_extra_bytes - \
|
||||
ZO_z_input_len)
|
||||
#else
|
||||
# define ZO_z_extract_offset ZO_z_extra_bytes
|
||||
#endif
|
||||
|
||||
/*
|
||||
* The extract_offset has to be bigger than ZO head section. Otherwise when
|
||||
* the head code is running to move ZO to the end of the buffer, it will
|
||||
* overwrite the head code itself.
|
||||
*/
|
||||
#if (ZO__ehead - ZO_startup_32) > ZO_z_extract_offset
|
||||
# define ZO_z_min_extract_offset ((ZO__ehead - ZO_startup_32 + 4095) & ~4095)
|
||||
#else
|
||||
# define ZO_z_min_extract_offset ((ZO_z_extract_offset + 4095) & ~4095)
|
||||
#endif
|
||||
|
||||
#define ZO_INIT_SIZE (ZO__end - ZO_startup_32 + ZO_z_min_extract_offset)
|
||||
|
||||
#define VO_INIT_SIZE (VO__end - VO__text)
|
||||
#if ZO_INIT_SIZE > VO_INIT_SIZE
|
||||
#define INIT_SIZE ZO_INIT_SIZE
|
||||
# define INIT_SIZE ZO_INIT_SIZE
|
||||
#else
|
||||
#define INIT_SIZE VO_INIT_SIZE
|
||||
# define INIT_SIZE VO_INIT_SIZE
|
||||
#endif
|
||||
|
||||
init_size: .long INIT_SIZE # kernel initialization size
|
||||
handover_offset: .long 0 # Filled in by build.c
|
||||
|
||||
|
|
|
|||
|
|
@ -173,6 +173,7 @@ CONFIG_TIGON3=y
|
|||
CONFIG_NET_TULIP=y
|
||||
CONFIG_E100=y
|
||||
CONFIG_E1000=y
|
||||
CONFIG_E1000E=y
|
||||
CONFIG_SKY2=y
|
||||
CONFIG_FORCEDETH=y
|
||||
CONFIG_8139TOO=y
|
||||
|
|
|
|||
|
|
@ -1477,7 +1477,7 @@ static int __init aesni_init(void)
|
|||
}
|
||||
aesni_ctr_enc_tfm = aesni_ctr_enc;
|
||||
#ifdef CONFIG_AS_AVX
|
||||
if (cpu_has_avx) {
|
||||
if (boot_cpu_has(X86_FEATURE_AVX)) {
|
||||
/* optimize performance of ctr mode encryption transform */
|
||||
aesni_ctr_enc_tfm = aesni_ctr_enc_avx_tfm;
|
||||
pr_info("AES CTR mode by8 optimization enabled\n");
|
||||
|
|
|
|||
|
|
@ -562,7 +562,10 @@ static int __init camellia_aesni_init(void)
|
|||
{
|
||||
const char *feature_name;
|
||||
|
||||
if (!cpu_has_avx2 || !cpu_has_avx || !cpu_has_aes || !cpu_has_osxsave) {
|
||||
if (!boot_cpu_has(X86_FEATURE_AVX) ||
|
||||
!boot_cpu_has(X86_FEATURE_AVX2) ||
|
||||
!boot_cpu_has(X86_FEATURE_AES) ||
|
||||
!boot_cpu_has(X86_FEATURE_OSXSAVE)) {
|
||||
pr_info("AVX2 or AES-NI instructions are not detected.\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -554,7 +554,9 @@ static int __init camellia_aesni_init(void)
|
|||
{
|
||||
const char *feature_name;
|
||||
|
||||
if (!cpu_has_avx || !cpu_has_aes || !cpu_has_osxsave) {
|
||||
if (!boot_cpu_has(X86_FEATURE_AVX) ||
|
||||
!boot_cpu_has(X86_FEATURE_AES) ||
|
||||
!boot_cpu_has(X86_FEATURE_OSXSAVE)) {
|
||||
pr_info("AVX or AES-NI instructions are not detected.\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -129,7 +129,8 @@ static int __init chacha20_simd_mod_init(void)
|
|||
return -ENODEV;
|
||||
|
||||
#ifdef CONFIG_AS_AVX2
|
||||
chacha20_use_avx2 = cpu_has_avx && cpu_has_avx2 &&
|
||||
chacha20_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
|
||||
boot_cpu_has(X86_FEATURE_AVX2) &&
|
||||
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
|
||||
#endif
|
||||
return crypto_register_alg(&alg);
|
||||
|
|
|
|||
|
|
@ -179,11 +179,12 @@ static struct shash_alg alg = {
|
|||
|
||||
static int __init poly1305_simd_mod_init(void)
|
||||
{
|
||||
if (!cpu_has_xmm2)
|
||||
if (!boot_cpu_has(X86_FEATURE_XMM2))
|
||||
return -ENODEV;
|
||||
|
||||
#ifdef CONFIG_AS_AVX2
|
||||
poly1305_use_avx2 = cpu_has_avx && cpu_has_avx2 &&
|
||||
poly1305_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
|
||||
boot_cpu_has(X86_FEATURE_AVX2) &&
|
||||
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
|
||||
alg.descsize = sizeof(struct poly1305_simd_desc_ctx);
|
||||
if (poly1305_use_avx2)
|
||||
|
|
|
|||
|
|
@ -538,7 +538,7 @@ static int __init init(void)
|
|||
{
|
||||
const char *feature_name;
|
||||
|
||||
if (!cpu_has_avx2 || !cpu_has_osxsave) {
|
||||
if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
|
||||
pr_info("AVX2 instructions are not detected.\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -600,7 +600,7 @@ static struct crypto_alg serpent_algs[10] = { {
|
|||
|
||||
static int __init serpent_sse2_init(void)
|
||||
{
|
||||
if (!cpu_has_xmm2) {
|
||||
if (!boot_cpu_has(X86_FEATURE_XMM2)) {
|
||||
printk(KERN_INFO "SSE2 instructions are not detected.\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -102,14 +102,14 @@ static asmlinkage struct job_sha1* (*sha1_job_mgr_submit)(struct sha1_mb_mgr *st
|
|||
static asmlinkage struct job_sha1* (*sha1_job_mgr_flush)(struct sha1_mb_mgr *state);
|
||||
static asmlinkage struct job_sha1* (*sha1_job_mgr_get_comp_job)(struct sha1_mb_mgr *state);
|
||||
|
||||
inline void sha1_init_digest(uint32_t *digest)
|
||||
static inline void sha1_init_digest(uint32_t *digest)
|
||||
{
|
||||
static const uint32_t initial_digest[SHA1_DIGEST_LENGTH] = {SHA1_H0,
|
||||
SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 };
|
||||
memcpy(digest, initial_digest, sizeof(initial_digest));
|
||||
}
|
||||
|
||||
inline uint32_t sha1_pad(uint8_t padblock[SHA1_BLOCK_SIZE * 2],
|
||||
static inline uint32_t sha1_pad(uint8_t padblock[SHA1_BLOCK_SIZE * 2],
|
||||
uint32_t total_len)
|
||||
{
|
||||
uint32_t i = total_len & (SHA1_BLOCK_SIZE - 1);
|
||||
|
|
|
|||
|
|
@ -166,7 +166,7 @@ static struct shash_alg sha1_avx_alg = {
|
|||
static bool avx_usable(void)
|
||||
{
|
||||
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
|
||||
if (cpu_has_avx)
|
||||
if (boot_cpu_has(X86_FEATURE_AVX))
|
||||
pr_info("AVX detected but unusable.\n");
|
||||
return false;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -201,7 +201,7 @@ static struct shash_alg sha256_avx_algs[] = { {
|
|||
static bool avx_usable(void)
|
||||
{
|
||||
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
|
||||
if (cpu_has_avx)
|
||||
if (boot_cpu_has(X86_FEATURE_AVX))
|
||||
pr_info("AVX detected but unusable.\n");
|
||||
return false;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -151,7 +151,7 @@ asmlinkage void sha512_transform_avx(u64 *digest, const char *data,
|
|||
static bool avx_usable(void)
|
||||
{
|
||||
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
|
||||
if (cpu_has_avx)
|
||||
if (boot_cpu_has(X86_FEATURE_AVX))
|
||||
pr_info("AVX detected but unusable.\n");
|
||||
return false;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -191,7 +191,7 @@ long syscall_trace_enter_phase2(struct pt_regs *regs, u32 arch,
|
|||
|
||||
long syscall_trace_enter(struct pt_regs *regs)
|
||||
{
|
||||
u32 arch = is_ia32_task() ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
|
||||
u32 arch = in_ia32_syscall() ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
|
||||
unsigned long phase1_result = syscall_trace_enter_phase1(regs, arch);
|
||||
|
||||
if (phase1_result == 0)
|
||||
|
|
|
|||
|
|
@ -207,10 +207,7 @@
|
|||
ENTRY(ret_from_fork)
|
||||
pushl %eax
|
||||
call schedule_tail
|
||||
GET_THREAD_INFO(%ebp)
|
||||
popl %eax
|
||||
pushl $0x0202 # Reset kernel eflags
|
||||
popfl
|
||||
|
||||
/* When we fork, we trace the syscall return in the child, too. */
|
||||
movl %esp, %eax
|
||||
|
|
@ -221,10 +218,7 @@ END(ret_from_fork)
|
|||
ENTRY(ret_from_kernel_thread)
|
||||
pushl %eax
|
||||
call schedule_tail
|
||||
GET_THREAD_INFO(%ebp)
|
||||
popl %eax
|
||||
pushl $0x0202 # Reset kernel eflags
|
||||
popfl
|
||||
movl PT_EBP(%esp), %eax
|
||||
call *PT_EBX(%esp)
|
||||
movl $0, PT_EAX(%esp)
|
||||
|
|
@ -251,7 +245,6 @@ ENDPROC(ret_from_kernel_thread)
|
|||
ret_from_exception:
|
||||
preempt_stop(CLBR_ANY)
|
||||
ret_from_intr:
|
||||
GET_THREAD_INFO(%ebp)
|
||||
#ifdef CONFIG_VM86
|
||||
movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS
|
||||
movb PT_CS(%esp), %al
|
||||
|
|
|
|||
|
|
@ -372,9 +372,6 @@ END(ptregs_\func)
|
|||
ENTRY(ret_from_fork)
|
||||
LOCK ; btr $TIF_FORK, TI_flags(%r8)
|
||||
|
||||
pushq $0x0002
|
||||
popfq /* reset kernel eflags */
|
||||
|
||||
call schedule_tail /* rdi: 'prev' task parameter */
|
||||
|
||||
testb $3, CS(%rsp) /* from kernel_thread? */
|
||||
|
|
@ -781,19 +778,25 @@ ENTRY(native_load_gs_index)
|
|||
pushfq
|
||||
DISABLE_INTERRUPTS(CLBR_ANY & ~CLBR_RDI)
|
||||
SWAPGS
|
||||
gs_change:
|
||||
.Lgs_change:
|
||||
movl %edi, %gs
|
||||
2: mfence /* workaround */
|
||||
2: ALTERNATIVE "", "mfence", X86_BUG_SWAPGS_FENCE
|
||||
SWAPGS
|
||||
popfq
|
||||
ret
|
||||
END(native_load_gs_index)
|
||||
|
||||
_ASM_EXTABLE(gs_change, bad_gs)
|
||||
_ASM_EXTABLE(.Lgs_change, bad_gs)
|
||||
.section .fixup, "ax"
|
||||
/* running with kernelgs */
|
||||
bad_gs:
|
||||
SWAPGS /* switch back to user gs */
|
||||
.macro ZAP_GS
|
||||
/* This can't be a string because the preprocessor needs to see it. */
|
||||
movl $__USER_DS, %eax
|
||||
movl %eax, %gs
|
||||
.endm
|
||||
ALTERNATIVE "", "ZAP_GS", X86_BUG_NULL_SEG
|
||||
xorl %eax, %eax
|
||||
movl %eax, %gs
|
||||
jmp 2b
|
||||
|
|
@ -1019,13 +1022,13 @@ ENTRY(error_entry)
|
|||
movl %ecx, %eax /* zero extend */
|
||||
cmpq %rax, RIP+8(%rsp)
|
||||
je .Lbstep_iret
|
||||
cmpq $gs_change, RIP+8(%rsp)
|
||||
cmpq $.Lgs_change, RIP+8(%rsp)
|
||||
jne .Lerror_entry_done
|
||||
|
||||
/*
|
||||
* hack: gs_change can fail with user gsbase. If this happens, fix up
|
||||
* hack: .Lgs_change can fail with user gsbase. If this happens, fix up
|
||||
* gsbase and proceed. We'll fix up the exception and land in
|
||||
* gs_change's error handler with kernel gsbase.
|
||||
* .Lgs_change's error handler with kernel gsbase.
|
||||
*/
|
||||
jmp .Lerror_entry_from_usermode_swapgs
|
||||
|
||||
|
|
|
|||
|
|
@ -72,24 +72,23 @@ ENTRY(entry_SYSENTER_compat)
|
|||
pushfq /* pt_regs->flags (except IF = 0) */
|
||||
orl $X86_EFLAGS_IF, (%rsp) /* Fix saved flags */
|
||||
pushq $__USER32_CS /* pt_regs->cs */
|
||||
xorq %r8,%r8
|
||||
pushq %r8 /* pt_regs->ip = 0 (placeholder) */
|
||||
pushq $0 /* pt_regs->ip = 0 (placeholder) */
|
||||
pushq %rax /* pt_regs->orig_ax */
|
||||
pushq %rdi /* pt_regs->di */
|
||||
pushq %rsi /* pt_regs->si */
|
||||
pushq %rdx /* pt_regs->dx */
|
||||
pushq %rcx /* pt_regs->cx */
|
||||
pushq $-ENOSYS /* pt_regs->ax */
|
||||
pushq %r8 /* pt_regs->r8 = 0 */
|
||||
pushq %r8 /* pt_regs->r9 = 0 */
|
||||
pushq %r8 /* pt_regs->r10 = 0 */
|
||||
pushq %r8 /* pt_regs->r11 = 0 */
|
||||
pushq $0 /* pt_regs->r8 = 0 */
|
||||
pushq $0 /* pt_regs->r9 = 0 */
|
||||
pushq $0 /* pt_regs->r10 = 0 */
|
||||
pushq $0 /* pt_regs->r11 = 0 */
|
||||
pushq %rbx /* pt_regs->rbx */
|
||||
pushq %rbp /* pt_regs->rbp (will be overwritten) */
|
||||
pushq %r8 /* pt_regs->r12 = 0 */
|
||||
pushq %r8 /* pt_regs->r13 = 0 */
|
||||
pushq %r8 /* pt_regs->r14 = 0 */
|
||||
pushq %r8 /* pt_regs->r15 = 0 */
|
||||
pushq $0 /* pt_regs->r12 = 0 */
|
||||
pushq $0 /* pt_regs->r13 = 0 */
|
||||
pushq $0 /* pt_regs->r14 = 0 */
|
||||
pushq $0 /* pt_regs->r15 = 0 */
|
||||
cld
|
||||
|
||||
/*
|
||||
|
|
@ -205,17 +204,16 @@ ENTRY(entry_SYSCALL_compat)
|
|||
pushq %rdx /* pt_regs->dx */
|
||||
pushq %rbp /* pt_regs->cx (stashed in bp) */
|
||||
pushq $-ENOSYS /* pt_regs->ax */
|
||||
xorq %r8,%r8
|
||||
pushq %r8 /* pt_regs->r8 = 0 */
|
||||
pushq %r8 /* pt_regs->r9 = 0 */
|
||||
pushq %r8 /* pt_regs->r10 = 0 */
|
||||
pushq %r8 /* pt_regs->r11 = 0 */
|
||||
pushq $0 /* pt_regs->r8 = 0 */
|
||||
pushq $0 /* pt_regs->r9 = 0 */
|
||||
pushq $0 /* pt_regs->r10 = 0 */
|
||||
pushq $0 /* pt_regs->r11 = 0 */
|
||||
pushq %rbx /* pt_regs->rbx */
|
||||
pushq %rbp /* pt_regs->rbp (will be overwritten) */
|
||||
pushq %r8 /* pt_regs->r12 = 0 */
|
||||
pushq %r8 /* pt_regs->r13 = 0 */
|
||||
pushq %r8 /* pt_regs->r14 = 0 */
|
||||
pushq %r8 /* pt_regs->r15 = 0 */
|
||||
pushq $0 /* pt_regs->r12 = 0 */
|
||||
pushq $0 /* pt_regs->r13 = 0 */
|
||||
pushq $0 /* pt_regs->r14 = 0 */
|
||||
pushq $0 /* pt_regs->r15 = 0 */
|
||||
|
||||
/*
|
||||
* User mode is traced as though IRQs are on, and SYSENTER
|
||||
|
|
@ -316,11 +314,10 @@ ENTRY(entry_INT80_compat)
|
|||
pushq %rdx /* pt_regs->dx */
|
||||
pushq %rcx /* pt_regs->cx */
|
||||
pushq $-ENOSYS /* pt_regs->ax */
|
||||
xorq %r8,%r8
|
||||
pushq %r8 /* pt_regs->r8 = 0 */
|
||||
pushq %r8 /* pt_regs->r9 = 0 */
|
||||
pushq %r8 /* pt_regs->r10 = 0 */
|
||||
pushq %r8 /* pt_regs->r11 = 0 */
|
||||
pushq $0 /* pt_regs->r8 = 0 */
|
||||
pushq $0 /* pt_regs->r9 = 0 */
|
||||
pushq $0 /* pt_regs->r10 = 0 */
|
||||
pushq $0 /* pt_regs->r11 = 0 */
|
||||
pushq %rbx /* pt_regs->rbx */
|
||||
pushq %rbp /* pt_regs->rbp */
|
||||
pushq %r12 /* pt_regs->r12 */
|
||||
|
|
|
|||
|
|
@ -374,3 +374,5 @@
|
|||
543 x32 io_setup compat_sys_io_setup
|
||||
544 x32 io_submit compat_sys_io_submit
|
||||
545 x32 execveat compat_sys_execveat/ptregs
|
||||
534 x32 preadv2 compat_sys_preadv2
|
||||
535 x32 pwritev2 compat_sys_pwritev2
|
||||
|
|
|
|||
|
|
@ -13,7 +13,6 @@
|
|||
|
||||
#include <uapi/linux/time.h>
|
||||
#include <asm/vgtod.h>
|
||||
#include <asm/hpet.h>
|
||||
#include <asm/vvar.h>
|
||||
#include <asm/unistd.h>
|
||||
#include <asm/msr.h>
|
||||
|
|
@ -28,16 +27,6 @@ extern int __vdso_clock_gettime(clockid_t clock, struct timespec *ts);
|
|||
extern int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz);
|
||||
extern time_t __vdso_time(time_t *t);
|
||||
|
||||
#ifdef CONFIG_HPET_TIMER
|
||||
extern u8 hpet_page
|
||||
__attribute__((visibility("hidden")));
|
||||
|
||||
static notrace cycle_t vread_hpet(void)
|
||||
{
|
||||
return *(const volatile u32 *)(&hpet_page + HPET_COUNTER);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_PARAVIRT_CLOCK
|
||||
extern u8 pvclock_page
|
||||
__attribute__((visibility("hidden")));
|
||||
|
|
@ -195,10 +184,6 @@ notrace static inline u64 vgetsns(int *mode)
|
|||
|
||||
if (gtod->vclock_mode == VCLOCK_TSC)
|
||||
cycles = vread_tsc();
|
||||
#ifdef CONFIG_HPET_TIMER
|
||||
else if (gtod->vclock_mode == VCLOCK_HPET)
|
||||
cycles = vread_hpet();
|
||||
#endif
|
||||
#ifdef CONFIG_PARAVIRT_CLOCK
|
||||
else if (gtod->vclock_mode == VCLOCK_PVCLOCK)
|
||||
cycles = vread_pvclock(mode);
|
||||
|
|
|
|||
|
|
@ -25,7 +25,7 @@ SECTIONS
|
|||
* segment.
|
||||
*/
|
||||
|
||||
vvar_start = . - 3 * PAGE_SIZE;
|
||||
vvar_start = . - 2 * PAGE_SIZE;
|
||||
vvar_page = vvar_start;
|
||||
|
||||
/* Place all vvars at the offsets in asm/vvar.h. */
|
||||
|
|
@ -35,8 +35,7 @@ SECTIONS
|
|||
#undef __VVAR_KERNEL_LDS
|
||||
#undef EMIT_VVAR
|
||||
|
||||
hpet_page = vvar_start + PAGE_SIZE;
|
||||
pvclock_page = vvar_start + 2 * PAGE_SIZE;
|
||||
pvclock_page = vvar_start + PAGE_SIZE;
|
||||
|
||||
. = SIZEOF_HEADERS;
|
||||
|
||||
|
|
|
|||
|
|
@ -18,7 +18,6 @@
|
|||
#include <asm/vdso.h>
|
||||
#include <asm/vvar.h>
|
||||
#include <asm/page.h>
|
||||
#include <asm/hpet.h>
|
||||
#include <asm/desc.h>
|
||||
#include <asm/cpufeature.h>
|
||||
|
||||
|
|
@ -129,16 +128,6 @@ static int vvar_fault(const struct vm_special_mapping *sm,
|
|||
if (sym_offset == image->sym_vvar_page) {
|
||||
ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address,
|
||||
__pa_symbol(&__vvar_page) >> PAGE_SHIFT);
|
||||
} else if (sym_offset == image->sym_hpet_page) {
|
||||
#ifdef CONFIG_HPET_TIMER
|
||||
if (hpet_address && vclock_was_used(VCLOCK_HPET)) {
|
||||
ret = vm_insert_pfn_prot(
|
||||
vma,
|
||||
(unsigned long)vmf->virtual_address,
|
||||
hpet_address >> PAGE_SHIFT,
|
||||
pgprot_noncached(PAGE_READONLY));
|
||||
}
|
||||
#endif
|
||||
} else if (sym_offset == image->sym_pvclock_page) {
|
||||
struct pvclock_vsyscall_time_info *pvti =
|
||||
pvclock_pvti_cpu0_va();
|
||||
|
|
|
|||
|
|
@ -0,0 +1,36 @@
|
|||
menu "Performance monitoring"
|
||||
|
||||
config PERF_EVENTS_INTEL_UNCORE
|
||||
tristate "Intel uncore performance events"
|
||||
depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
|
||||
default y
|
||||
---help---
|
||||
Include support for Intel uncore performance events. These are
|
||||
available on NehalemEX and more modern processors.
|
||||
|
||||
config PERF_EVENTS_INTEL_RAPL
|
||||
tristate "Intel rapl performance events"
|
||||
depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
|
||||
default y
|
||||
---help---
|
||||
Include support for Intel rapl performance events for power
|
||||
monitoring on modern processors.
|
||||
|
||||
config PERF_EVENTS_INTEL_CSTATE
|
||||
tristate "Intel cstate performance events"
|
||||
depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
|
||||
default y
|
||||
---help---
|
||||
Include support for Intel cstate performance events for power
|
||||
monitoring on modern processors.
|
||||
|
||||
config PERF_EVENTS_AMD_POWER
|
||||
depends on PERF_EVENTS && CPU_SUP_AMD
|
||||
tristate "AMD Processor Power Reporting Mechanism"
|
||||
---help---
|
||||
Provide power reporting mechanism support for AMD processors.
|
||||
Currently, it leverages X86_FEATURE_ACC_POWER
|
||||
(CPUID Fn8000_0007_EDX[12]) interface to calculate the
|
||||
average power consumption on Family 15h processors.
|
||||
|
||||
endmenu
|
||||
|
|
@ -6,9 +6,6 @@ obj-$(CONFIG_X86_LOCAL_APIC) += amd/ibs.o msr.o
|
|||
ifdef CONFIG_AMD_IOMMU
|
||||
obj-$(CONFIG_CPU_SUP_AMD) += amd/iommu.o
|
||||
endif
|
||||
obj-$(CONFIG_CPU_SUP_INTEL) += intel/core.o intel/bts.o intel/cqm.o
|
||||
obj-$(CONFIG_CPU_SUP_INTEL) += intel/cstate.o intel/ds.o intel/knc.o
|
||||
obj-$(CONFIG_CPU_SUP_INTEL) += intel/lbr.o intel/p4.o intel/p6.o intel/pt.o
|
||||
obj-$(CONFIG_CPU_SUP_INTEL) += intel/rapl.o msr.o
|
||||
obj-$(CONFIG_PERF_EVENTS_INTEL_UNCORE) += intel/uncore.o intel/uncore_nhmex.o
|
||||
obj-$(CONFIG_PERF_EVENTS_INTEL_UNCORE) += intel/uncore_snb.o intel/uncore_snbep.o
|
||||
|
||||
obj-$(CONFIG_CPU_SUP_INTEL) += msr.o
|
||||
obj-$(CONFIG_CPU_SUP_INTEL) += intel/
|
||||
|
|
|
|||
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Reference in New Issue