![David Howells](/assets/img/avatar_default.png)
This facility provides three entry points: ilog2() Log base 2 of unsigned long ilog2_u32() Log base 2 of u32 ilog2_u64() Log base 2 of u64 These facilities can either be used inside functions on dynamic data: int do_something(long q) { ...; y = ilog2(x) ...; } Or can be used to statically initialise global variables with constant values: unsigned n = ilog2(27); When performing static initialisation, the compiler will report "error: initializer element is not constant" if asked to take a log of zero or of something not reducible to a constant. They treat negative numbers as unsigned. When not dealing with a constant, they fall back to using fls() which permits them to use arch-specific log calculation instructions - such as BSR on x86/x86_64 or SCAN on FRV - if available. [akpm@osdl.org: MMC fix] Signed-off-by: David Howells <dhowells@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: David Howells <dhowells@redhat.com> Cc: Wojtek Kaniewski <wojtekka@toxygen.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
205 lines
3.3 KiB
Plaintext
205 lines
3.3 KiB
Plaintext
#
|
|
# For a description of the syntax of this configuration file,
|
|
# see Documentation/kbuild/kconfig-language.txt.
|
|
#
|
|
|
|
mainmenu "Linux Kernel Configuration"
|
|
|
|
config AVR32
|
|
bool
|
|
default y
|
|
# With EMBEDDED=n, we get lots of stuff automatically selected
|
|
# that we usually don't need on AVR32.
|
|
select EMBEDDED
|
|
help
|
|
AVR32 is a high-performance 32-bit RISC microprocessor core,
|
|
designed for cost-sensitive embedded applications, with particular
|
|
emphasis on low power consumption and high code density.
|
|
|
|
There is an AVR32 Linux project with a web page at
|
|
http://avr32linux.org/.
|
|
|
|
config UID16
|
|
bool
|
|
|
|
config GENERIC_HARDIRQS
|
|
bool
|
|
default y
|
|
|
|
config HARDIRQS_SW_RESEND
|
|
bool
|
|
default y
|
|
|
|
config GENERIC_IRQ_PROBE
|
|
bool
|
|
default y
|
|
|
|
config RWSEM_GENERIC_SPINLOCK
|
|
bool
|
|
default y
|
|
|
|
config GENERIC_TIME
|
|
bool
|
|
default y
|
|
|
|
config RWSEM_XCHGADD_ALGORITHM
|
|
bool
|
|
|
|
config ARCH_HAS_ILOG2_U32
|
|
bool
|
|
default n
|
|
|
|
config ARCH_HAS_ILOG2_U64
|
|
bool
|
|
default n
|
|
|
|
config GENERIC_BUST_SPINLOCK
|
|
bool
|
|
|
|
config GENERIC_HWEIGHT
|
|
bool
|
|
default y
|
|
|
|
config GENERIC_CALIBRATE_DELAY
|
|
bool
|
|
default y
|
|
|
|
source "init/Kconfig"
|
|
|
|
menu "System Type and features"
|
|
|
|
config SUBARCH_AVR32B
|
|
bool
|
|
config MMU
|
|
bool
|
|
config PERFORMANCE_COUNTERS
|
|
bool
|
|
|
|
config PLATFORM_AT32AP
|
|
bool
|
|
select SUBARCH_AVR32B
|
|
select MMU
|
|
select PERFORMANCE_COUNTERS
|
|
|
|
choice
|
|
prompt "AVR32 CPU type"
|
|
default CPU_AT32AP7000
|
|
|
|
config CPU_AT32AP7000
|
|
bool "AT32AP7000"
|
|
select PLATFORM_AT32AP
|
|
endchoice
|
|
|
|
#
|
|
# CPU Daughterboards for ATSTK1000
|
|
config BOARD_ATSTK1002
|
|
bool
|
|
|
|
choice
|
|
prompt "AVR32 board type"
|
|
default BOARD_ATSTK1000
|
|
|
|
config BOARD_ATSTK1000
|
|
bool "ATSTK1000 evaluation board"
|
|
select BOARD_ATSTK1002 if CPU_AT32AP7000
|
|
endchoice
|
|
|
|
choice
|
|
prompt "Boot loader type"
|
|
default LOADER_U_BOOT
|
|
|
|
config LOADER_U_BOOT
|
|
bool "U-Boot (or similar) bootloader"
|
|
endchoice
|
|
|
|
config LOAD_ADDRESS
|
|
hex
|
|
default 0x10000000 if LOADER_U_BOOT=y && CPU_AT32AP7000=y
|
|
|
|
config ENTRY_ADDRESS
|
|
hex
|
|
default 0x90000000 if LOADER_U_BOOT=y && CPU_AT32AP7000=y
|
|
|
|
config PHYS_OFFSET
|
|
hex
|
|
default 0x10000000 if CPU_AT32AP7000=y
|
|
|
|
source "kernel/Kconfig.preempt"
|
|
|
|
config HAVE_ARCH_BOOTMEM_NODE
|
|
bool
|
|
default n
|
|
|
|
config ARCH_HAVE_MEMORY_PRESENT
|
|
bool
|
|
default n
|
|
|
|
config NEED_NODE_MEMMAP_SIZE
|
|
bool
|
|
default n
|
|
|
|
config ARCH_FLATMEM_ENABLE
|
|
bool
|
|
default y
|
|
|
|
config ARCH_DISCONTIGMEM_ENABLE
|
|
bool
|
|
default n
|
|
|
|
config ARCH_SPARSEMEM_ENABLE
|
|
bool
|
|
default n
|
|
|
|
source "mm/Kconfig"
|
|
|
|
config OWNERSHIP_TRACE
|
|
bool "Ownership trace support"
|
|
default y
|
|
help
|
|
Say Y to generate an Ownership Trace message on every context switch,
|
|
enabling Nexus-compliant debuggers to keep track of the PID of the
|
|
currently executing task.
|
|
|
|
# FPU emulation goes here
|
|
|
|
source "kernel/Kconfig.hz"
|
|
|
|
config CMDLINE
|
|
string "Default kernel command line"
|
|
default ""
|
|
help
|
|
If you don't have a boot loader capable of passing a command line string
|
|
to the kernel, you may specify one here. As a minimum, you should specify
|
|
the memory size and the root device (e.g., mem=8M, root=/dev/nfs).
|
|
|
|
endmenu
|
|
|
|
menu "Bus options"
|
|
|
|
config PCI
|
|
bool
|
|
|
|
source "drivers/pci/Kconfig"
|
|
|
|
source "drivers/pcmcia/Kconfig"
|
|
|
|
endmenu
|
|
|
|
menu "Executable file formats"
|
|
source "fs/Kconfig.binfmt"
|
|
endmenu
|
|
|
|
source "net/Kconfig"
|
|
|
|
source "drivers/Kconfig"
|
|
|
|
source "fs/Kconfig"
|
|
|
|
source "arch/avr32/Kconfig.debug"
|
|
|
|
source "security/Kconfig"
|
|
|
|
source "crypto/Kconfig"
|
|
|
|
source "lib/Kconfig"
|