diff options
Diffstat (limited to 'arch/sparc/lib/locks.S')
| -rw-r--r-- | arch/sparc/lib/locks.S | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/sparc/lib/locks.S b/arch/sparc/lib/locks.S new file mode 100644 index 000000000000..95fa48424967 --- /dev/null +++ b/arch/sparc/lib/locks.S | |||
| @@ -0,0 +1,72 @@ | |||
| 1 | /* $Id: locks.S,v 1.16 2000/02/26 11:02:47 anton Exp $ | ||
| 2 | * locks.S: SMP low-level lock primitives on Sparc. | ||
| 3 | * | ||
| 4 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | ||
| 5 | * Copyright (C) 1998 Anton Blanchard (anton@progsoc.uts.edu.au) | ||
| 6 | * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz) | ||
| 7 | */ | ||
| 8 | |||
| 9 | #include <asm/ptrace.h> | ||
| 10 | #include <asm/psr.h> | ||
| 11 | #include <asm/smp.h> | ||
| 12 | #include <asm/spinlock.h> | ||
| 13 | |||
| 14 | .text | ||
| 15 | .align 4 | ||
| 16 | |||
| 17 | /* Read/writer locks, as usual this is overly clever to make it | ||
| 18 | * as fast as possible. | ||
| 19 | */ | ||
| 20 | |||
| 21 | /* caches... */ | ||
| 22 | ___rw_read_enter_spin_on_wlock: | ||
| 23 | orcc %g2, 0x0, %g0 | ||
| 24 | be,a ___rw_read_enter | ||
| 25 | ldstub [%g1 + 3], %g2 | ||
| 26 | b ___rw_read_enter_spin_on_wlock | ||
| 27 | ldub [%g1 + 3], %g2 | ||
| 28 | ___rw_read_exit_spin_on_wlock: | ||
| 29 | orcc %g2, 0x0, %g0 | ||
| 30 | be,a ___rw_read_exit | ||
| 31 | ldstub [%g1 + 3], %g2 | ||
| 32 | b ___rw_read_exit_spin_on_wlock | ||
| 33 | ldub [%g1 + 3], %g2 | ||
| 34 | ___rw_write_enter_spin_on_wlock: | ||
| 35 | orcc %g2, 0x0, %g0 | ||
| 36 | be,a ___rw_write_enter | ||
| 37 | ldstub [%g1 + 3], %g2 | ||
| 38 | b ___rw_write_enter_spin_on_wlock | ||
| 39 | ld [%g1], %g2 | ||
| 40 | |||
| 41 | .globl ___rw_read_enter | ||
| 42 | ___rw_read_enter: | ||
| 43 | orcc %g2, 0x0, %g0 | ||
| 44 | bne,a ___rw_read_enter_spin_on_wlock | ||
| 45 | ldub [%g1 + 3], %g2 | ||
| 46 | ld [%g1], %g2 | ||
| 47 | add %g2, 1, %g2 | ||
| 48 | st %g2, [%g1] | ||
| 49 | retl | ||
| 50 | mov %g4, %o7 | ||
| 51 | |||
| 52 | .globl ___rw_read_exit | ||
| 53 | ___rw_read_exit: | ||
| 54 | orcc %g2, 0x0, %g0 | ||
| 55 | bne,a ___rw_read_exit_spin_on_wlock | ||
| 56 | ldub [%g1 + 3], %g2 | ||
| 57 | ld [%g1], %g2 | ||
| 58 | sub %g2, 0x1ff, %g2 | ||
| 59 | st %g2, [%g1] | ||
| 60 | retl | ||
| 61 | mov %g4, %o7 | ||
| 62 | |||
| 63 | .globl ___rw_write_enter | ||
| 64 | ___rw_write_enter: | ||
| 65 | orcc %g2, 0x0, %g0 | ||
| 66 | bne ___rw_write_enter_spin_on_wlock | ||
| 67 | ld [%g1], %g2 | ||
| 68 | andncc %g2, 0xff, %g0 | ||
| 69 | bne,a ___rw_write_enter_spin_on_wlock | ||
| 70 | stb %g0, [%g1 + 3] | ||
| 71 | retl | ||
| 72 | mov %g4, %o7 | ||