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authorZachary Amsden <zach@vmware.com>2005-09-03 15:56:42 -0700
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 00:06:12 -0700
commitf2ab4461249df85b20930a7a57b54f39c5ae291a (patch)
tree17fbe46fdc6e95bf24faccb6001d89c989442f6f /include/asm-i386/msr.h
parent4f0cb8d978ab4b6e3b40147f619f48316d9d7f63 (diff)
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[PATCH] x86: more asm cleanups
Some more assembler cleanups I noticed along the way. Signed-off-by: Zachary Amsden <zach@vmware.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386/msr.h')
-rw-r--r--include/asm-i386/msr.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-i386/msr.h b/include/asm-i386/msr.h
index c76fce8..62b76cd 100644
--- a/include/asm-i386/msr.h
+++ b/include/asm-i386/msr.h
@@ -47,6 +47,21 @@ static inline void wrmsrl (unsigned long msr, unsigned long long val)
: "c" (msr), "0" (a), "d" (b), "i" (-EFAULT));\
ret__; })
+/* rdmsr with exception handling */
+#define rdmsr_safe(msr,a,b) ({ int ret__; \
+ asm volatile("2: rdmsr ; xorl %0,%0\n" \
+ "1:\n\t" \
+ ".section .fixup,\"ax\"\n\t" \
+ "3: movl %4,%0 ; jmp 1b\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n\t" \
+ " .long 2b,3b\n\t" \
+ ".previous" \
+ : "=r" (ret__), "=a" (*(a)), "=d" (*(b)) \
+ : "c" (msr), "i" (-EFAULT));\
+ ret__; })
+
#define rdtsc(low,high) \
__asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))