diff options
| author | Sam Ravnborg <sam@ravnborg.org> | 2008-12-03 03:10:25 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-12-04 09:17:19 -0800 |
| commit | 478b8fecda511942404ac232897a718cecd13e48 (patch) | |
| tree | e022fce8ca92f93a000e1cd686255f0b126e9fd5 /arch/sparc/lib/rwsem_64.S | |
| parent | 18269c0fd4db9bec2668f895f21d742486ccb90f (diff) | |
sparc,sparc64: unify lib/
o Renamed files in sparc64 to <name>_64.S when identical
to sparc32 files.
o iomap.c were equal for sparc32 and sparc64
o adjusted sparc/Makefile now we have only one lib/
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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 |