Commit 80841ad8 authored by Heiko Carstens's avatar Heiko Carstens Committed by Vasily Gorbik
Browse files

s390/alternatives: add alternative_input() / alternative_io() 



Add support for alternative inline assemblies with input and output
arguments. This is consistent to x86.

Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 78f65709

arch/s390/include/asm/alternative.h

+16 −0
Original line number Diff line number Diff line
@@ -145,6 +145,22 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end); 
	asm_inline volatile(ALTERNATIVE_2(oldinstr, altinstr1, facility1,   \

				   altinstr2, facility2) ::: "memory")



/* Alternative inline assembly with input. */

#define alternative_input(oldinstr, newinstr, feature, input...)	\

	asm_inline volatile (ALTERNATIVE(oldinstr, newinstr, feature)	\

		: : input)



/* Like alternative_input, but with a single output argument */

#define alternative_io(oldinstr, altinstr, facility, output, input...)	\

	asm_inline volatile(ALTERNATIVE(oldinstr, altinstr, facility)	\

		: output : input)



/* Use this macro if more than one output parameter is needed. */

#define ASM_OUTPUT2(a...) a



/* Use this macro if clobbers are needed without inputs. */

#define ASM_NO_INPUT_CLOBBER(clobber...) : clobber



#endif /* __ASSEMBLY__ */



#endif /* _ASM_S390_ALTERNATIVE_H */