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| author |   Zachary Amsden <zach@vmware.com> | 2005-09-03 15:56:42 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@evo.osdl.org> | 2005-09-05 00:06:12 -0700 |
| commit | f2ab4461249df85b20930a7a57b54f39c5ae291a (patch) | |
| tree | 17fbe46fdc6e95bf24faccb6001d89c989442f6f /include/asm-i386/msr.h | |
| parent | [PATCH] i386: fix incorrect TSS entry for LDT (diff) | |
| download | linux-dev-f2ab4461249df85b20930a7a57b54f39c5ae291a.tar.xz linux-dev-f2ab4461249df85b20930a7a57b54f39c5ae291a.zip | |
[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 '')
| -rw-r--r-- | include/asm-i386/msr.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-i386/msr.h b/include/asm-i386/msr.h index c76fce8badbb..62b76cd96957 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)) |