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authorAndi Kleen <ak@suse.de>2007-05-02 13:27:20 -0400
committerAndi Kleen <andi@basil.nowhere.org>2007-05-02 13:27:20 -0400
commite859dc553c857f4672b3bbb73ee9170a901f8712 (patch)
treeb71603823255c6eadfb8edbe66c8e8f4bb9caefe /include/asm-i386
parent3671df8572a299acff9c9cac2bf7279ee614d154 (diff)
[PATCH] i386: Implement alternative_io for i386
Ported from x86-64. Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/alternative.h15
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) {}
82 "663:\n\t" newinstr "\n664:\n" /* replacement */\ 82 "663:\n\t" newinstr "\n664:\n" /* replacement */\
83 ".previous" :: "i" (feature), ##input) 83 ".previous" :: "i" (feature), ##input)
84 84
85/* Like alternative_input, but with a single output argument */
86#define alternative_io(oldinstr, newinstr, feature, output, input...) \
87 asm volatile ("661:\n\t" oldinstr "\n662:\n" \
88 ".section .altinstructions,\"a\"\n" \
89 " .align 4\n" \
90 " .long 661b\n" /* label */ \
91 " .long 663f\n" /* new instruction */ \
92 " .byte %c[feat]\n" /* feature bit */ \
93 " .byte 662b-661b\n" /* sourcelen */ \
94 " .byte 664f-663f\n" /* replacementlen */ \
95 ".previous\n" \
96 ".section .altinstr_replacement,\"ax\"\n" \
97 "663:\n\t" newinstr "\n664:\n" /* replacement */ \
98 ".previous" : output : [feat] "i" (feature), ##input)
99
85/* 100/*
86 * Alternative inline assembly for SMP. 101 * Alternative inline assembly for SMP.
87 * 102 *