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| author |   Andi Kleen <ak@suse.de> | 2006-01-11 22:45:18 +0100 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:04:57 -0800 |
| commit | 6e54d95f73bbc79171802a1983e0c3835676db88 (patch) | |
| tree | 83b5ff3175f0b3fe445912cfaa98318d8b3ee24a /include/asm-x86_64/system.h | |
| parent | [PATCH] x86_64: Don't try to synchronize the TSC over CPUs on Intel CPUs at boot. (diff) | |
| download | linux-dev-6e54d95f73bbc79171802a1983e0c3835676db88.tar.xz linux-dev-6e54d95f73bbc79171802a1983e0c3835676db88.zip | |
[PATCH] x86_64: Support alternative() with a output argument.
Needed for follow on patches
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/system.h')
| -rw-r--r-- | include/asm-x86_64/system.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h index a3bca7552e14..80272190570e 100644 --- a/include/asm-x86_64/system.h +++ b/include/asm-x86_64/system.h @@ -137,6 +137,21 @@ struct alt_instr { "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 8\n" \ + " .quad 661b\n" /* label */ \ + " .quad 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) + /* * Clear and set 'TS' bit respectively */ |