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[ARM] 4126/1: Add the ARM specific barriers

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There are three barriers - ISB, DMB and DSB for different
scenarious. This patch adds their definitions in the system.h file.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2007-02-05 14:47:35 +01:00 committed by Russell King
parent ae0a846e41
commit dcda7e4ba1
1 changed files with 11 additions and 3 deletions
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14
include/asm-arm/system.h
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@ -193,11 +193,19 @@ extern unsigned int user_debug;
#endif
#if __LINUX_ARM_ARCH__ >= 6
#define mb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
: : "r" (0) : "memory")
#define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
: : "r" (0) : "memory")
#define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
: : "r" (0) : "memory")
#define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
: : "r" (0) : "memory")
#else
#define mb() __asm__ __volatile__ ("" : : : "memory")
#define isb() __asm__ __volatile__ ("" : : : "memory")
#define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
: : "r" (0) : "memory")
#define dmb() __asm__ __volatile__ ("" : : : "memory")
#endif
#define mb() dmb()
#define rmb() mb()
#define wmb() mb()
#define read_barrier_depends() do { } while(0)