[PATCH 14/20] [POWERPC] Add mfspr/mtspr inline macros to 4xx bootwrapper
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2007-12-13 07:38:42
The 4xx bootwrapper occasionally needs to access SPR registers, this adds mfspr/mtspr wrappers to it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> --- =================================================================== arch/powerpc/boot/reg.h | 8 ++++++++ 1 file changed, 8 insertions(+)
--- linux-work.orig/arch/powerpc/boot/reg.h 2007-12-10 15:52:03.000000000 +1100
+++ linux-work/arch/powerpc/boot/reg.h 2007-12-10 16:41:21.000000000 +1100@@ -16,6 +16,14 @@ static inline u32 mfpvr(void) return pvr; } +#define __stringify_1(x) #x +#define __stringify(x) __stringify_1(x) + +#define mfspr(rn) ({unsigned long rval; \ + asm volatile("mfspr %0," __stringify(rn) \ + : "=r" (rval)); rval; }) +#define mtspr(rn, v) asm volatile("mtspr " __stringify(rn) ",%0" : : "r" (v)) + register void *__stack_pointer asm("r1"); #define get_sp() (__stack_pointer)