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| author | Rusty Russell <rusty@rustcorp.com.au> | 2008-12-31 15:35:57 +0300 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-12-31 15:35:57 +0300 |
| commit | 2ca1a615835d9f4990f42102ab1f2ef434e7e89c (patch) | |
| tree | 726cf3d5f29a6c66c44e4bd68e7ebed2fd83d059 /arch/sparc/lib/rwsem_64.S | |
| parent | e12f0102ac81d660c9f801d0a0e10ccf4537a9de (diff) | |
| parent | 6a94cb73064c952255336cc57731904174b2c58f (diff) | |
| download | linux-2ca1a615835d9f4990f42102ab1f2ef434e7e89c.tar.xz | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
arch/x86/kernel/io_apic.c
Diffstat (limited to 'arch/sparc/lib/rwsem_64.S')
| -rw-r--r-- | arch/sparc/lib/rwsem_64.S | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/arch/sparc/lib/rwsem_64.S b/arch/sparc/lib/rwsem_64.S new file mode 100644 index 000000000000..91a7d29a79d5 --- /dev/null +++ b/arch/sparc/lib/rwsem_64.S @@ -0,0 +1,163 @@ +/* rwsem.S: RW semaphore assembler. + * + * Written by David S. Miller (davem@redhat.com), 2001. + * Derived from asm-i386/rwsem.h + */ + +#include <asm/rwsem-const.h> + + .section .sched.text, "ax" + + .globl __down_read +__down_read: +1: lduw [%o0], %g1 + add %g1, 1, %g7 + cas [%o0], %g1, %g7 + cmp %g1, %g7 + bne,pn %icc, 1b + add %g7, 1, %g7 + cmp %g7, 0 + bl,pn %icc, 3f + nop +2: + retl + nop +3: + save %sp, -192, %sp + call rwsem_down_read_failed + mov %i0, %o0 + ret + restore + .size __down_read, .-__down_read + + .globl __down_read_trylock +__down_read_trylock: +1: lduw [%o0], %g1 + add %g1, 1, %g7 + cmp %g7, 0 + bl,pn %icc, 2f + mov 0, %o1 + cas [%o0], %g1, %g7 + cmp %g1, %g7 + bne,pn %icc, 1b + mov 1, %o1 +2: retl + mov %o1, %o0 + .size __down_read_trylock, .-__down_read_trylock + + .globl __down_write +__down_write: + sethi %hi(RWSEM_ACTIVE_WRITE_BIAS), %g1 + or %g1, %lo(RWSEM_ACTIVE_WRITE_BIAS), %g1 +1: + lduw [%o0], %g3 + add %g3, %g1, %g7 + cas [%o0], %g3, %g7 + cmp %g3, %g7 + bne,pn %icc, 1b + cmp %g7, 0 + bne,pn %icc, 3f + nop +2: retl + nop +3: + save %sp, -192, %sp + call rwsem_down_write_failed + mov %i0, %o0 + ret + restore + .size __down_write, .-__down_write + + .globl __down_write_trylock +__down_write_trylock: + sethi %hi(RWSEM_ACTIVE_WRITE_BIAS), %g1 + or %g1, %lo(RWSEM_ACTIVE_WRITE_BIAS), %g1 +1: + lduw [%o0], %g3 + cmp %g3, 0 + bne,pn %icc, 2f + mov 0, %o1 + add %g3, %g1, %g7 + cas [%o0], %g3, %g7 + cmp %g3, %g7 + bne,pn %icc, 1b + mov 1, %o1 +2: retl + mov %o1, %o0 + .size __down_write_trylock, .-__down_write_trylock + + .globl __up_read +__up_read: +1: + lduw [%o0], %g1 + sub %g1, 1, %g7 + cas [%o0], %g1, %g7 + cmp %g1, %g7 + bne,pn %icc, 1b + cmp %g7, 0 + bl,pn %icc, 3f + nop +2: retl + nop +3: sethi %hi(RWSEM_ACTIVE_MASK), %g1 + sub %g7, 1, %g7 + or %g1, %lo(RWSEM_ACTIVE_MASK), %g1 + andcc %g7, %g1, %g0 + bne,pn %icc, 2b + nop + save %sp, -192, %sp + call rwsem_wake + mov %i0, %o0 + ret + restore + .size __up_read, .-__up_read + + .globl __up_write +__up_write: + sethi %hi(RWSEM_ACTIVE_WRITE_BIAS), %g1 + or %g1, %lo(RWSEM_ACTIVE_WRITE_BIAS), %g1 +1: + lduw [%o0], %g3 + sub %g3, %g1, %g7 + cas [%o0], %g3, %g7 + cmp %g3, %g7 + bne,pn %icc, 1b + sub %g7, %g1, %g7 + cmp %g7, 0 + bl,pn %icc, 3f + nop +2: + retl + nop +3: + save %sp, -192, %sp + call rwsem_wake + mov %i0, %o0 + ret + restore + .size __up_write, .-__up_write + + .globl __downgrade_write +__downgrade_write: + sethi %hi(RWSEM_WAITING_BIAS), %g1 + or %g1, %lo(RWSEM_WAITING_BIAS), %g1 +1: + lduw [%o0], %g3 + sub %g3, %g1, %g7 + cas [%o0], %g3, %g7 + cmp %g3, %g7 + bne,pn %icc, 1b + sub %g7, %g1, %g7 + cmp %g7, 0 + bl,pn %icc, 3f + nop +2: + retl + nop +3: + save %sp, -192, %sp + call rwsem_downgrade_wake + mov %i0, %o0 + ret + restore + .size __downgrade_write, .-__downgrade_write |