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

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

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-02-02 17:10:49 +01:00 committed by Vasily Gorbik
parent 78f6570946
commit 80841ad8d4
1 changed files with 16 additions and 0 deletions
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16
arch/s390/include/asm/alternative.h
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@ -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 */