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author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-30 17:23:31 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-30 17:23:31 -0800 |
commit | 6de71484cf9561edb45224f659a9db38b6056d5e (patch) | |
tree | 588fe6f7c98147b805085503c863d371e2fa497e /arch/sparc/lib/rwsem_32.S | |
parent | 1dff81f20cd55ffa5a8ee984da70ce0b99d29606 (diff) | |
parent | e3c6d4ee545e427b55882d97d3b663c6411645fe (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6: (98 commits)
sparc: move select of ARCH_SUPPORTS_MSI
sparc: drop SUN_IO
sparc: unify sections.h
sparc: use .data.init_task section for init_thread_union
sparc: fix array overrun check in of_device_64.c
sparc: unify module.c
sparc64: prepare module_64.c for unification
sparc64: use bit neutral Elf symbols
sparc: unify module.h
sparc: introduce CONFIG_BITS
sparc: fix hardirq.h removal fallout
sparc64: do not export pus_fs_struct
sparc: use sparc64 version of scatterlist.h
sparc: Commonize memcmp assembler.
sparc: Unify strlen assembler.
sparc: Add asm/asm.h
sparc: Kill memcmp_32.S code which has been ifdef'd out for centuries.
sparc: replace for_each_cpu_mask_nr with for_each_cpu
sparc: fix sparse warnings in irq_32.c
sparc: add include guards to kernel.h
...
Diffstat (limited to 'arch/sparc/lib/rwsem_32.S')
-rw-r--r-- | arch/sparc/lib/rwsem_32.S | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/arch/sparc/lib/rwsem_32.S b/arch/sparc/lib/rwsem_32.S new file mode 100644 index 00000000000..9675268e7fd --- /dev/null +++ b/arch/sparc/lib/rwsem_32.S @@ -0,0 +1,204 @@ +/* + * Assembly part of rw semaphores. + * + * Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com) + */ + +#include <asm/ptrace.h> +#include <asm/psr.h> + + .section .sched.text, "ax" + .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 |