From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <benh@ozlabs.org>
To: Josh Boyer <jwboyer@linux.vnet.ibm.com>
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Thu, 13 Dec 2007 18:38:42 +1100
Subject: [PATCH 14/20] [POWERPC] Add mfspr/mtspr inline macros to 4xx
	bootwrapper
Message-Id: <20071213073847.E9007DDFF0@ozlabs.org>
Cc: linuxppc-dev@ozlabs.org
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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)