projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 88278ca2 | 1 | /* |
| 1da177e4 LT |
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> | |
| d3867f04 | 13 | #include <asm/export.h> |
| 1da177e4 LT |
14 | |
| 15 | .text | |
| 16 | .align 4 | |
| 17 | ||
| 18 | /* Read/writer locks, as usual this is overly clever to make it | |
| 19 | * as fast as possible. | |
| 20 | */ | |
| 21 | ||
| 22 | /* caches... */ | |
| 23 | ___rw_read_enter_spin_on_wlock: | |
| 24 | orcc %g2, 0x0, %g0 | |
| 25 | be,a ___rw_read_enter | |
| 26 | ldstub [%g1 + 3], %g2 | |
| 27 | b ___rw_read_enter_spin_on_wlock | |
| 28 | ldub [%g1 + 3], %g2 | |
| 7a39f522 AV |
29 | ___rw_read_try_spin_on_wlock: |
| 30 | andcc %g2, 0xff, %g0 | |
| 31 | be,a ___rw_read_try | |
| 32 | ldstub [%g1 + 3], %g2 | |
| 33 | xnorcc %g2, 0x0, %o0 /* if g2 is ~0, set o0 to 0 and bugger off */ | |
| 34 | bne,a ___rw_read_enter_spin_on_wlock | |
| 35 | ld [%g1], %g2 | |
| 36 | retl | |
| 37 | mov %g4, %o7 | |
| 1da177e4 LT |
38 | ___rw_read_exit_spin_on_wlock: |
| 39 | orcc %g2, 0x0, %g0 | |
| 40 | be,a ___rw_read_exit | |
| 41 | ldstub [%g1 + 3], %g2 | |
| 42 | b ___rw_read_exit_spin_on_wlock | |
| 43 | ldub [%g1 + 3], %g2 | |
| 44 | ___rw_write_enter_spin_on_wlock: | |
| 45 | orcc %g2, 0x0, %g0 | |
| 46 | be,a ___rw_write_enter | |
| 47 | ldstub [%g1 + 3], %g2 | |
| 48 | b ___rw_write_enter_spin_on_wlock | |
| 49 | ld [%g1], %g2 | |
| 50 | ||
| 51 | .globl ___rw_read_enter | |
| d3867f04 | 52 | EXPORT_SYMBOL(___rw_read_enter) |
| 1da177e4 LT |
53 | ___rw_read_enter: |
| 54 | orcc %g2, 0x0, %g0 | |
| 55 | bne,a ___rw_read_enter_spin_on_wlock | |
| 56 | ldub [%g1 + 3], %g2 | |
| 57 | ld [%g1], %g2 | |
| 58 | add %g2, 1, %g2 | |
| 59 | st %g2, [%g1] | |
| 60 | retl | |
| 61 | mov %g4, %o7 | |
| 62 | ||
| 63 | .globl ___rw_read_exit | |
| d3867f04 | 64 | EXPORT_SYMBOL(___rw_read_exit) |
| 1da177e4 LT |
65 | ___rw_read_exit: |
| 66 | orcc %g2, 0x0, %g0 | |
| 67 | bne,a ___rw_read_exit_spin_on_wlock | |
| 68 | ldub [%g1 + 3], %g2 | |
| 69 | ld [%g1], %g2 | |
| 70 | sub %g2, 0x1ff, %g2 | |
| 71 | st %g2, [%g1] | |
| 72 | retl | |
| 73 | mov %g4, %o7 | |
| 74 | ||
| 7a39f522 | 75 | .globl ___rw_read_try |
| d3867f04 | 76 | EXPORT_SYMBOL(___rw_read_try) |
| 7a39f522 AV |
77 | ___rw_read_try: |
| 78 | orcc %g2, 0x0, %g0 | |
| 79 | bne ___rw_read_try_spin_on_wlock | |
| 80 | ld [%g1], %g2 | |
| 81 | add %g2, 1, %g2 | |
| 82 | st %g2, [%g1] | |
| 83 | set 1, %o1 | |
| 84 | retl | |
| 85 | mov %g4, %o7 | |
| 86 | ||
| 1da177e4 | 87 | .globl ___rw_write_enter |
| d3867f04 | 88 | EXPORT_SYMBOL(___rw_write_enter) |
| 1da177e4 LT |
89 | ___rw_write_enter: |
| 90 | orcc %g2, 0x0, %g0 | |
| 91 | bne ___rw_write_enter_spin_on_wlock | |
| 92 | ld [%g1], %g2 | |
| 93 | andncc %g2, 0xff, %g0 | |
| 94 | bne,a ___rw_write_enter_spin_on_wlock | |
| 95 | stb %g0, [%g1 + 3] | |
| 96 | retl | |
| 97 | mov %g4, %o7 |