From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 21 Dec 2007 04:39:32 +0000 (+1100)
Subject: [POWERPC] 4xx: Add mfspr/mtspr inline macros to 4xx bootwrapper
X-Git-Tag: v2.6.25-rc1~1131^2~183
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=ee41eea947ebe2f1f627fafe0e429b5dcaaab944;p=linux-2.6-omap-h63xx.git

[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>
---

diff --git a/arch/powerpc/boot/reg.h b/arch/powerpc/boot/reg.h
index d3cd9ee98af..9c2c9978e0e 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)