2005-04-25 10:36:23 -06:00
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005 Thiemo Seufer
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2013-01-22 04:59:30 -07:00
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* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
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2005-04-25 10:36:23 -06:00
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* Author: Maciej W. Rozycki <macro@mips.com>
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*/
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#include <asm/addrspace.h>
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#include <asm/bug.h>
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2007-07-11 09:55:40 -06:00
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#include <asm/cacheflush.h>
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2005-04-25 10:36:23 -06:00
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#ifndef CKSEG2
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#define CKSEG2 CKSSEG
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#endif
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#ifndef TO_PHYS_MASK
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#define TO_PHYS_MASK -1
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#endif
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/*
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* FUNC is executed in one of the uncached segments, depending on its
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* original address as follows:
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*
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* 1. If the original address is in CKSEG0 or CKSEG1, then the uncached
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* segment used is CKSEG1.
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* 2. If the original address is in XKPHYS, then the uncached segment
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* used is XKPHYS(2).
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* 3. Otherwise it's a bug.
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*
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* The same remapping is done with the stack pointer. Stack handling
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* works because we don't handle stack arguments or more complex return
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* values, so we can avoid sharing the same stack area between a cached
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* and the uncached mode.
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*/
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MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream.
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
Here, we remove all the MIPS __cpuinit from C code and __CPUINIT
from asm files. MIPS is interesting in this respect, because there
are also uasm users hiding behind their own renamed versions of the
__cpuinit macros.
[1] https://lkml.org/lkml/2013/5/20/589
[ralf@linux-mips.org: Folded in Paul's followup fix.]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5494/
Patchwork: https://patchwork.linux-mips.org/patch/5495/
Patchwork: https://patchwork.linux-mips.org/patch/5509/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-06-18 07:38:59 -06:00
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unsigned long run_uncached(void *func)
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2005-04-25 10:36:23 -06:00
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{
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register long ret __asm__("$2");
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long lfunc = (long)func, ufunc;
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long usp;
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2020-12-11 03:24:37 -07:00
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long sp;
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__asm__("move %0, $sp" : "=r" (sp));
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2005-04-25 10:36:23 -06:00
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if (sp >= (long)CKSEG0 && sp < (long)CKSEG2)
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usp = CKSEG1ADDR(sp);
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2007-02-05 18:59:22 -07:00
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#ifdef CONFIG_64BIT
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2007-10-31 15:11:24 -06:00
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else if ((long long)sp >= (long long)PHYS_TO_XKPHYS(0, 0) &&
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(long long)sp < (long long)PHYS_TO_XKPHYS(8, 0))
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usp = PHYS_TO_XKPHYS(K_CALG_UNCACHED,
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2005-04-25 10:36:23 -06:00
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XKPHYS_TO_PHYS((long long)sp));
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2007-02-05 18:59:22 -07:00
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#endif
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2005-04-25 10:36:23 -06:00
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else {
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BUG();
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usp = sp;
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}
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if (lfunc >= (long)CKSEG0 && lfunc < (long)CKSEG2)
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ufunc = CKSEG1ADDR(lfunc);
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2007-02-05 18:59:22 -07:00
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#ifdef CONFIG_64BIT
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2007-10-31 15:11:24 -06:00
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else if ((long long)lfunc >= (long long)PHYS_TO_XKPHYS(0, 0) &&
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(long long)lfunc < (long long)PHYS_TO_XKPHYS(8, 0))
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ufunc = PHYS_TO_XKPHYS(K_CALG_UNCACHED,
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2005-04-25 10:36:23 -06:00
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XKPHYS_TO_PHYS((long long)lfunc));
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2007-02-05 18:59:22 -07:00
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#endif
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2005-04-25 10:36:23 -06:00
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else {
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BUG();
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ufunc = lfunc;
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}
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__asm__ __volatile__ (
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" move $16, $sp\n"
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" move $sp, %1\n"
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" jalr %2\n"
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" move $sp, $16"
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: "=r" (ret)
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: "r" (usp), "r" (ufunc)
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: "$16", "$31");
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return ret;
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}
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