From ee41eea947ebe2f1f627fafe0e429b5dcaaab944 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 21 Dec 2007 15:39:32 +1100
Subject: [PATCH] [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: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
---
arch/powerpc/boot/reg.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/powerpc/boot/reg.h b/arch/powerpc/boot/reg.h
index d3cd9ee98afb9f..9c2c9978e0eb2f 100644
--- a/arch/powerpc/boot/reg.h
+++ b/arch/powerpc/boot/reg.h
@@ -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)
--
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