Pre-v7 processors don't have wfe/sev, so these are defined for
consistency as empty barrier asms.
For v6, wfi is architected as a defined MCR instruction, so
use that definition.
Doing a no-op instead of wfi() is probably bad, so for older
processors than v6, wfi() is not defined. If needed, some CPU-
specific wfi() will have to be defined elsewhere.
Signed-off-by: Dave Martin <dave.martin@xxxxxxxxxx>
---
arch/arm/include/asm/system.h | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 97f6d60..0e1cae3 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -129,7 +129,14 @@ extern unsigned int user_debug;
#define sev() __asm__ __volatile__ ("sev" : : : "memory")
#define wfe() __asm__ __volatile__ ("wfe" : : : "memory")
#define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
+#else /* __LINUX_ARM_ARCH__ < 7 */
+#define sev() __asm__ __volatile__ ("" : : : "memory")
+#define wfe() __asm__ __volatile__ ("" : : : "memory")
+#if __LINUX_ARM_ARCH__ == 6
+#define wfi() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
+ : : "r" (0) : "memory")
#endif
+#endif /* __LINUX_ARM_ARCH__ < 7 */
#if __LINUX_ARM_ARCH__ >= 7
#define isb() __asm__ __volatile__ ("isb" : : : "memory")
--
1.7.1
--
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