projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 24f287e4 | 1 | /* atomic.S: These things are too big to do inline. |
| 1da177e4 | 2 | * |
| 193d2aad | 3 | * Copyright (C) 1999, 2007 2012 David S. Miller (davem@davemloft.net) |
| 1da177e4 LT |
4 | */ |
| 5 | ||
| 8695c37d | 6 | #include <linux/linkage.h> |
| 1da177e4 | 7 | #include <asm/asi.h> |
| 24f287e4 | 8 | #include <asm/backoff.h> |
| 1da177e4 | 9 | |
| 1da177e4 LT |
10 | .text |
| 11 | ||
| 12 | /* Two versions of the atomic routines, one that | |
| 13 | * does not return a value and does not perform | |
| 14 | * memory barriers, and a second which returns | |
| 15 | * a value and does the barriers. | |
| 16 | */ | |
| 1da177e4 | 17 | |
| 4f3316c2 PZ |
18 | #define ATOMIC_OP(op) \ |
| 19 | ENTRY(atomic_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
| 20 | BACKOFF_SETUP(%o2); \ | |
| 21 | 1: lduw [%o1], %g1; \ | |
| 22 | op %g1, %o0, %g7; \ | |
| 23 | cas [%o1], %g1, %g7; \ | |
| 24 | cmp %g1, %g7; \ | |
| 25 | bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ | |
| 26 | nop; \ | |
| 27 | retl; \ | |
| 28 | nop; \ | |
| 29 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ | |
| 30 | ENDPROC(atomic_##op); \ | |
| 1da177e4 | 31 | |
| 4f3316c2 PZ |
32 | #define ATOMIC_OP_RETURN(op) \ |
| 33 | ENTRY(atomic_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
| 34 | BACKOFF_SETUP(%o2); \ | |
| 35 | 1: lduw [%o1], %g1; \ | |
| 36 | op %g1, %o0, %g7; \ | |
| 37 | cas [%o1], %g1, %g7; \ | |
| 38 | cmp %g1, %g7; \ | |
| 39 | bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ | |
| caa17d49 | 40 | op %g1, %o0, %g1; \ |
| 4f3316c2 PZ |
41 | retl; \ |
| 42 | sra %g1, 0, %o0; \ | |
| 43 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ | |
| 44 | ENDPROC(atomic_##op##_return); | |
| 1da177e4 | 45 | |
| 4f3316c2 | 46 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) |
| 1da177e4 | 47 | |
| 4f3316c2 PZ |
48 | ATOMIC_OPS(add) |
| 49 | ATOMIC_OPS(sub) | |
| 304a0d69 PZ |
50 | ATOMIC_OP(and) |
| 51 | ATOMIC_OP(or) | |
| 52 | ATOMIC_OP(xor) | |
| 1da177e4 | 53 | |
| 4f3316c2 PZ |
54 | #undef ATOMIC_OPS |
| 55 | #undef ATOMIC_OP_RETURN | |
| 56 | #undef ATOMIC_OP | |
| 1da177e4 | 57 | |
| 4f3316c2 PZ |
58 | #define ATOMIC64_OP(op) \ |
| 59 | ENTRY(atomic64_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
| 60 | BACKOFF_SETUP(%o2); \ | |
| 61 | 1: ldx [%o1], %g1; \ | |
| 62 | op %g1, %o0, %g7; \ | |
| 63 | casx [%o1], %g1, %g7; \ | |
| 64 | cmp %g1, %g7; \ | |
| 65 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ | |
| 66 | nop; \ | |
| 67 | retl; \ | |
| 68 | nop; \ | |
| 69 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ | |
| 70 | ENDPROC(atomic64_##op); \ | |
| 1da177e4 | 71 | |
| 4f3316c2 PZ |
72 | #define ATOMIC64_OP_RETURN(op) \ |
| 73 | ENTRY(atomic64_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
| 74 | BACKOFF_SETUP(%o2); \ | |
| 75 | 1: ldx [%o1], %g1; \ | |
| 76 | op %g1, %o0, %g7; \ | |
| 77 | casx [%o1], %g1, %g7; \ | |
| 78 | cmp %g1, %g7; \ | |
| 79 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ | |
| 80 | nop; \ | |
| 81 | retl; \ | |
| caa17d49 | 82 | op %g1, %o0, %o0; \ |
| 4f3316c2 PZ |
83 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ |
| 84 | ENDPROC(atomic64_##op##_return); | |
| 85 | ||
| 86 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) | |
| 87 | ||
| 88 | ATOMIC64_OPS(add) | |
| 89 | ATOMIC64_OPS(sub) | |
| 304a0d69 PZ |
90 | ATOMIC64_OP(and) |
| 91 | ATOMIC64_OP(or) | |
| 92 | ATOMIC64_OP(xor) | |
| 4f3316c2 PZ |
93 | |
| 94 | #undef ATOMIC64_OPS | |
| 95 | #undef ATOMIC64_OP_RETURN | |
| 96 | #undef ATOMIC64_OP | |
| 193d2aad DM |
97 | |
| 98 | ENTRY(atomic64_dec_if_positive) /* %o0 = atomic_ptr */ | |
| 99 | BACKOFF_SETUP(%o2) | |
| 100 | 1: ldx [%o0], %g1 | |
| 101 | brlez,pn %g1, 3f | |
| 102 | sub %g1, 1, %g7 | |
| 103 | casx [%o0], %g1, %g7 | |
| 104 | cmp %g1, %g7 | |
| 105 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b) | |
| 106 | nop | |
| 107 | 3: retl | |
| 108 | sub %g1, 1, %o0 | |
| 109 | 2: BACKOFF_SPIN(%o2, %o3, 1b) | |
| 110 | ENDPROC(atomic64_dec_if_positive) |