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Commit dcda7e4b authored by Catalin Marinas's avatar Catalin Marinas Committed by Russell King
Browse files

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



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

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent ae0a846e

include/asm-arm/system.h

+11 −3
Original line number Diff line number Diff line
@@ -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" \

#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)