From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Cc: linuxppc-dev@ozlabs.org
Subject: [PATCH 14/20] [POWERPC] Add mfspr/mtspr inline macros to 4xx bootwrapper
Date: Thu, 13 Dec 2007 18:38:42 +1100 [thread overview]
Message-ID: <20071213073847.E9007DDFF0@ozlabs.org> (raw)
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)
reply other threads:[~2007-12-13 7:38 UTC|newest]
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