Commit ee41eea9 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Josh Boyer
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[POWERPC] 4xx: Add mfspr/mtspr inline macros to 4xx bootwrapper 



The 4xx bootwrapper occasionally needs to access SPR registers,
this adds mfspr/mtspr wrappers to it.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarJosh Boyer <jwboyer@linux.vnet.ibm.com>
parent d23f5099

arch/powerpc/boot/reg.h

+8 −0
Original line number Diff line number Diff line
@@ -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)