diff options
Diffstat (limited to 'arch/sparc/lib/atomic_32.S')
| -rw-r--r-- | arch/sparc/lib/atomic_32.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/sparc/lib/atomic_32.S b/arch/sparc/lib/atomic_32.S new file mode 100644 index 00000000..eb6c7359 --- /dev/null +++ b/arch/sparc/lib/atomic_32.S @@ -0,0 +1,44 @@ +/* atomic.S: Move this stuff here for better ICACHE hit rates. + * + * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu) + */ + +#include <asm/ptrace.h> +#include <asm/psr.h> + + .text + .align 4 + + .globl __atomic_begin +__atomic_begin: + +#ifndef CONFIG_SMP + .globl ___xchg32_sun4c +___xchg32_sun4c: + rd %psr, %g3 + andcc %g3, PSR_PIL, %g0 + bne 1f + nop + wr %g3, PSR_PIL, %psr + nop; nop; nop +1: + andcc %g3, PSR_PIL, %g0 + ld [%g1], %g7 + bne 1f + st %g2, [%g1] + wr %g3, 0x0, %psr + nop; nop; nop +1: + mov %g7, %g2 + jmpl %o7 + 8, %g0 + mov %g4, %o7 + + .globl ___xchg32_sun4md +___xchg32_sun4md: + swap [%g1], %g2 + jmpl %o7 + 8, %g0 + mov %g4, %o7 +#endif + + .globl __atomic_end +__atomic_end: |