diff options
Diffstat (limited to 'arch/sparc/lib/rwsem.S')
| -rw-r--r-- | arch/sparc/lib/rwsem.S | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/arch/sparc/lib/rwsem.S b/arch/sparc/lib/rwsem.S new file mode 100644 index 000000000000..e7578dc600b8 --- /dev/null +++ b/arch/sparc/lib/rwsem.S @@ -0,0 +1,205 @@ +/* $Id: rwsem.S,v 1.5 2000/05/09 17:40:13 davem Exp $ + * Assembly part of rw semaphores. + * + * Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com) + */ + +#include <linux/config.h> +#include <asm/ptrace.h> +#include <asm/psr.h> + + .section .sched.text + .align 4 + + .globl ___down_read +___down_read: + rd %psr, %g3 + nop + nop + nop + or %g3, PSR_PIL, %g7 + wr %g7, 0, %psr + nop + nop + nop +#ifdef CONFIG_SMP +1: ldstub [%g1 + 4], %g7 + tst %g7 + bne 1b + ld [%g1], %g7 + sub %g7, 1, %g7 + st %g7, [%g1] + stb %g0, [%g1 + 4] +#else + ld [%g1], %g7 + sub %g7, 1, %g7 + st %g7, [%g1] +#endif + wr %g3, 0, %psr + add %g7, 1, %g7 + nop + nop + subcc %g7, 1, %g7 + bneg 3f + nop +2: jmpl %o7, %g0 + mov %g4, %o7 +3: save %sp, -64, %sp + mov %g1, %l1 + mov %g4, %l4 + bcs 4f + mov %g5, %l5 + call down_read_failed + mov %l1, %o0 + mov %l1, %g1 + mov %l4, %g4 + ba ___down_read + restore %l5, %g0, %g5 +4: call down_read_failed_biased + mov %l1, %o0 + mov %l1, %g1 + mov %l4, %g4 + ba 2b + restore %l5, %g0, %g5 + + .globl ___down_write +___down_write: + rd %psr, %g3 + nop + nop + nop + or %g3, PSR_PIL, %g7 + wr %g7, 0, %psr + sethi %hi(0x01000000), %g2 + nop + nop +#ifdef CONFIG_SMP +1: ldstub [%g1 + 4], %g7 + tst %g7 + bne 1b + ld [%g1], %g7 + sub %g7, %g2, %g7 + st %g7, [%g1] + stb %g0, [%g1 + 4] +#else + ld [%g1], %g7 + sub %g7, %g2, %g7 + st %g7, [%g1] +#endif + wr %g3, 0, %psr + add %g7, %g2, %g7 + nop + nop + subcc %g7, %g2, %g7 + bne 3f + nop +2: jmpl %o7, %g0 + mov %g4, %o7 +3: save %sp, -64, %sp + mov %g1, %l1 + mov %g4, %l4 + bcs 4f + mov %g5, %l5 + call down_write_failed + mov %l1, %o0 + mov %l1, %g1 + mov %l4, %g4 + ba ___down_write + restore %l5, %g0, %g5 +4: call down_write_failed_biased + mov %l1, %o0 + mov %l1, %g1 + mov %l4, %g4 + ba 2b + restore %l5, %g0, %g5 + + .text + .globl ___up_read +___up_read: + rd %psr, %g3 + nop + nop + nop + or %g3, PSR_PIL, %g7 + wr %g7, 0, %psr + nop + nop + nop +#ifdef CONFIG_SMP +1: ldstub [%g1 + 4], %g7 + tst %g7 + bne 1b + ld [%g1], %g7 + add %g7, 1, %g7 + st %g7, [%g1] + stb %g0, [%g1 + 4] +#else + ld [%g1], %g7 + add %g7, 1, %g7 + st %g7, [%g1] +#endif + wr %g3, 0, %psr + nop + nop + nop + cmp %g7, 0 + be 3f + nop +2: jmpl %o7, %g0 + mov %g4, %o7 +3: save %sp, -64, %sp + mov %g1, %l1 + mov %g4, %l4 + mov %g5, %l5 + clr %o1 + call __rwsem_wake + mov %l1, %o0 + mov %l1, %g1 + mov %l4, %g4 + ba 2b + restore %l5, %g0, %g5 + + .globl ___up_write +___up_write: + rd %psr, %g3 + nop + nop + nop + or %g3, PSR_PIL, %g7 + wr %g7, 0, %psr + sethi %hi(0x01000000), %g2 + nop + nop +#ifdef CONFIG_SMP +1: ldstub [%g1 + 4], %g7 + tst %g7 + bne 1b + ld [%g1], %g7 + add %g7, %g2, %g7 + st %g7, [%g1] + stb %g0, [%g1 + 4] +#else + ld [%g1], %g7 + add %g7, %g2, %g7 + st %g7, [%g1] +#endif + wr %g3, 0, %psr + sub %g7, %g2, %g7 + nop + nop + addcc %g7, %g2, %g7 + bcs 3f + nop +2: jmpl %o7, %g0 + mov %g4, %o7 +3: save %sp, -64, %sp + mov %g1, %l1 + mov %g4, %l4 + mov %g5, %l5 + mov %g7, %o1 + call __rwsem_wake + mov %l1, %o0 + mov %l1, %g1 + mov %l4, %g4 + ba 2b + restore %l5, %g0, %g5 |