diff options
Diffstat (limited to 'arch/sparc/lib/atomic_32.S')
| -rw-r--r-- | arch/sparc/lib/atomic_32.S | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/arch/sparc/lib/atomic_32.S b/arch/sparc/lib/atomic_32.S index 178cbb8ae1b..eb6c7359cbd 100644 --- a/arch/sparc/lib/atomic_32.S +++ b/arch/sparc/lib/atomic_32.S @@ -40,60 +40,5 @@ ___xchg32_sun4md: mov %g4, %o7 #endif - /* Read asm-sparc/atomic.h carefully to understand how this works for SMP. - * Really, some things here for SMP are overly clever, go read the header. - */ - .globl ___atomic24_add -___atomic24_add: - rd %psr, %g3 ! Keep the code small, old way was stupid - nop; nop; nop; ! Let the bits set - or %g3, PSR_PIL, %g7 ! Disable interrupts - wr %g7, 0x0, %psr ! Set %psr - nop; nop; nop; ! Let the bits set -#ifdef CONFIG_SMP -1: ldstub [%g1 + 3], %g7 ! Spin on the byte lock for SMP. - orcc %g7, 0x0, %g0 ! Did we get it? - bne 1b ! Nope... - ld [%g1], %g7 ! Load locked atomic24_t - sra %g7, 8, %g7 ! Get signed 24-bit integer - add %g7, %g2, %g2 ! Add in argument - sll %g2, 8, %g7 ! Transpose back to atomic24_t - st %g7, [%g1] ! Clever: This releases the lock as well. -#else - ld [%g1], %g7 ! Load locked atomic24_t - add %g7, %g2, %g2 ! Add in argument - st %g2, [%g1] ! Store it back -#endif - wr %g3, 0x0, %psr ! Restore original PSR_PIL - nop; nop; nop; ! Let the bits set - jmpl %o7, %g0 ! NOTE: not + 8, see callers in atomic.h - mov %g4, %o7 ! Restore %o7 - - .globl ___atomic24_sub -___atomic24_sub: - rd %psr, %g3 ! Keep the code small, old way was stupid - nop; nop; nop; ! Let the bits set - or %g3, PSR_PIL, %g7 ! Disable interrupts - wr %g7, 0x0, %psr ! Set %psr - nop; nop; nop; ! Let the bits set -#ifdef CONFIG_SMP -1: ldstub [%g1 + 3], %g7 ! Spin on the byte lock for SMP. - orcc %g7, 0x0, %g0 ! Did we get it? - bne 1b ! Nope... - ld [%g1], %g7 ! Load locked atomic24_t - sra %g7, 8, %g7 ! Get signed 24-bit integer - sub %g7, %g2, %g2 ! Subtract argument - sll %g2, 8, %g7 ! Transpose back to atomic24_t - st %g7, [%g1] ! Clever: This releases the lock as well -#else - ld [%g1], %g7 ! Load locked atomic24_t - sub %g7, %g2, %g2 ! Subtract argument - st %g2, [%g1] ! Store it back -#endif - wr %g3, 0x0, %psr ! Restore original PSR_PIL - nop; nop; nop; ! Let the bits set - jmpl %o7, %g0 ! NOTE: not + 8, see callers in atomic.h - mov %g4, %o7 ! Restore %o7 - .globl __atomic_end __atomic_end: |