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[ARM SMP] Add configuration option for ARMv6K processors

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The 'K' extension adds several new instructions to the ARMv6 ISA
which are primerily useful for SMP.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-11-03 15:48:21 +00:00 committed by Russell King
parent 06024f217d
commit 4a5f79e7e6
3 changed files with 14 additions and 1 deletions
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1
arch/arm/Makefile
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@ -38,6 +38,7 @@ comma = ,
# macro, but instead defines a whole series of macros which makes
# testing for a specific architecture or later rather impossible.
arch-$(CONFIG_CPU_32v6) :=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6)
arch-$(CONFIG_CPU_32v6K) :=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6k,-march=armv5t -Wa$(comma)-march=armv6k)
arch-$(CONFIG_CPU_32v5) :=-D__LINUX_ARM_ARCH__=5 $(call cc-option,-march=armv5te,-march=armv4)
arch-$(CONFIG_CPU_32v4) :=-D__LINUX_ARM_ARCH__=4 -march=armv4
arch-$(CONFIG_CPU_32v3) :=-D__LINUX_ARM_ARCH__=3 -march=armv3

2
arch/arm/lib/bitops.h
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@ -1,6 +1,6 @@
#include <linux/config.h>
#if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_CPU_MPCORE)
#if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_CPU_32v6K)
.macro bitop, instr
mov r2, #1
and r3, r0, #7 @ Get bit offset

12
arch/arm/mm/Kconfig
View File

@ -250,6 +250,18 @@ config CPU_V6
select CPU_COPY_V6
select CPU_TLB_V6
# ARMv6k
config CPU_32v6K
bool "Support ARM V6K processor extensions" if !SMP
depends on CPU_V6
default y if SMP
help
Say Y here if your ARMv6 processor supports the 'K' extension.
This enables the kernel to use some instructions not present
on previous processors, and as such a kernel build with this
enabled will not boot on processors with do not support these
instructions.
# Figure out what processor architecture version we should be using.
# This defines the compiler instruction set which depends on the machine type.
config CPU_32v3