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ARM: add wfi assembly macro

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Since wfi instruction is only available on ARMv7, add a conditional
macro for it.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Rob Herring 2012-12-02 17:06:21 +00:00 committed by Albert ARIBAUD
parent b0404ea126
commit 2ff467c051
1 changed files with 6 additions and 0 deletions
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6
arch/arm/include/asm/system.h
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@ -61,6 +61,12 @@
#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
#ifdef __ARM_ARCH_7A__
#define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
#else
#define wfi()
#endif
static inline unsigned int get_cr(void)
{
unsigned int val;