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| author |   Andi Kleen <ak@suse.de> | 2007-05-02 19:27:20 +0200 |
|---|---|---|
| committer |   Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:20 +0200 |
| commit | e859dc553c857f4672b3bbb73ee9170a901f8712 (patch) | |
| tree | b71603823255c6eadfb8edbe66c8e8f4bb9caefe /include/asm-i386/alternative.h | |
| parent | [PATCH] i386: Evaluate constant cpu features at runtime (diff) | |
| download | linux-dev-e859dc553c857f4672b3bbb73ee9170a901f8712.tar.xz linux-dev-e859dc553c857f4672b3bbb73ee9170a901f8712.zip | |
[PATCH] i386: Implement alternative_io for i386
Ported from x86-64.
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | include/asm-i386/alternative.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-i386/alternative.h b/include/asm-i386/alternative.h index 277467329583..0f70b379b029 100644 --- a/include/asm-i386/alternative.h +++ b/include/asm-i386/alternative.h @@ -82,6 +82,21 @@ static inline void alternatives_smp_switch(int smp) {} "663:\n\t" newinstr "\n664:\n" /* replacement */\ ".previous" :: "i" (feature), ##input) +/* Like alternative_input, but with a single output argument */ +#define alternative_io(oldinstr, newinstr, feature, output, input...) \ + asm volatile ("661:\n\t" oldinstr "\n662:\n" \ + ".section .altinstructions,\"a\"\n" \ + " .align 4\n" \ + " .long 661b\n" /* label */ \ + " .long 663f\n" /* new instruction */ \ + " .byte %c[feat]\n" /* feature bit */ \ + " .byte 662b-661b\n" /* sourcelen */ \ + " .byte 664f-663f\n" /* replacementlen */ \ + ".previous\n" \ + ".section .altinstr_replacement,\"ax\"\n" \ + "663:\n\t" newinstr "\n664:\n" /* replacement */ \ + ".previous" : output : [feat] "i" (feature), ##input) + /* * Alternative inline assembly for SMP. * |