Commit e859dc55 authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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[PATCH] i386: Implement alternative_io for i386 



Ported from x86-64.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent 3671df85

include/asm-i386/alternative.h

+15 −0
Original line number Diff line number Diff line
@@ -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.

 *