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

[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
......@@ -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)
......
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