diff options
| author |   Heiko Carstens <hca@linux.ibm.com> | 2021-02-02 17:10:49 +0100 |
|---|---|---|
| committer |   Vasily Gorbik <gor@linux.ibm.com> | 2021-02-09 15:57:06 +0100 |
| commit | 80841ad8d4ca3e91d90e18b4fa0cc1c925e9fad1 (patch) | |
| tree | 11e9c8d1dd5196ff7582d02dfb13ff31afb4f7a2 /arch | |
| parent | s390/entry: use cpu alternative for stck/stckf (diff) | |
| download | linux-dev-80841ad8d4ca3e91d90e18b4fa0cc1c925e9fad1.tar.xz linux-dev-80841ad8d4ca3e91d90e18b4fa0cc1c925e9fad1.zip | |
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: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/include/asm/alternative.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/s390/include/asm/alternative.h b/arch/s390/include/asm/alternative.h index 1c8a38f762a3..d3880ca764ee 100644 --- a/arch/s390/include/asm/alternative.h +++ b/arch/s390/include/asm/alternative.h @@ -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 */ |