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authorAndi Kleen <ak@suse.de>2006-01-11 22:45:18 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:04:57 -0800
commit6e54d95f73bbc79171802a1983e0c3835676db88 (patch)
tree83b5ff3175f0b3fe445912cfaa98318d8b3ee24a /include/asm-x86_64
parent737c5c3bde5641af9c24e3a60366674af72a43ef (diff)
[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')
-rw-r--r--include/asm-x86_64/system.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index a3bca7552e1..80272190570 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
*/