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| author |   Sam Ravnborg <sam@ravnborg.org> | 2012-05-25 21:20:09 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-05-27 23:52:43 -0700 |
| commit | 5b8b93c4ab17a250a35e6db1cce094bf599a21c6 (patch) | |
| tree | 9ce54b39fe8193d245a4511f23d02d4b037d0245 /arch/sparc/include/asm/asmmacro.h | |
| parent | sparc32: introduce sparc32_start_kernel called from head_32.S (diff) | |
| download | wireguard-linux-5b8b93c4ab17a250a35e6db1cce094bf599a21c6.tar.xz wireguard-linux-5b8b93c4ab17a250a35e6db1cce094bf599a21c6.zip | |
sparc32: add support for run-time patching of leon/sun single instructions
This will be used to handle that MMUREGS has different ASI for SUN and LEON.
This is the infrastructure only - users will come later.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: Konrad Eisele <konrad@gaisler.com>
Diffstat (limited to 'arch/sparc/include/asm/asmmacro.h')
| -rw-r--r-- | arch/sparc/include/asm/asmmacro.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/asmmacro.h b/arch/sparc/include/asm/asmmacro.h index 02a172fb193a..a0e28ef02558 100644 --- a/arch/sparc/include/asm/asmmacro.h +++ b/arch/sparc/include/asm/asmmacro.h @@ -20,4 +20,26 @@ /* All traps low-level code here must end with this macro. */ #define RESTORE_ALL b ret_trap_entry; clr %l6; +/* Support for run-time patching of single instructions. + * This is used to handle the differences in the ASI for + * MMUREGS for LEON and SUN. + * + * Sample: + * LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %o0 + * SUN_PI_(lda [%g0] ASI_M_MMUREGS, %o0 + * PI == Patch Instruction + * + * For LEON we will use the first variant, + * and for all other we will use the SUN variant. + * The order is important. + */ +#define LEON_PI(...) \ +662: __VA_ARGS__ + +#define SUN_PI_(...) \ + .section .leon_1insn_patch, "ax"; \ + .word 662b; \ + __VA_ARGS__; \ + .previous + #endif /* !(_SPARC_ASMMACRO_H) */ |