Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: bitops.S,v 1.3 2001/11/18 00:12:56 davem Exp $ |
| 2 | * bitops.S: Sparc64 atomic bit operations. |
| 3 | * |
| 4 | * Copyright (C) 2000 David S. Miller (davem@redhat.com) |
| 5 | */ |
| 6 | |
| 7 | #include <linux/config.h> |
| 8 | #include <asm/asi.h> |
| 9 | |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 10 | .text |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | /* On SMP we need to use memory barriers to ensure |
| 13 | * correct memory operation ordering, nop these out |
| 14 | * for uniprocessor. |
| 15 | */ |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #ifdef CONFIG_SMP |
| 18 | #define BITOP_PRE_BARRIER membar #StoreLoad | #LoadLoad |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 19 | #define BITOP_POST_BARRIER \ |
| 20 | ba,pt %xcc, 80b; \ |
| 21 | membar #StoreLoad | #StoreStore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 23 | 80: retl |
| 24 | nop |
| 25 | #else |
| 26 | #define BITOP_PRE_BARRIER |
| 27 | #define BITOP_POST_BARRIER |
| 28 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | .globl test_and_set_bit |
| 31 | .type test_and_set_bit,#function |
| 32 | test_and_set_bit: /* %o0=nr, %o1=addr */ |
| 33 | BITOP_PRE_BARRIER |
| 34 | srlx %o0, 6, %g1 |
| 35 | mov 1, %o2 |
| 36 | sllx %g1, 3, %g3 |
| 37 | and %o0, 63, %g2 |
| 38 | sllx %o2, %g2, %o2 |
| 39 | add %o1, %g3, %o1 |
| 40 | 1: ldx [%o1], %g7 |
| 41 | or %g7, %o2, %g1 |
| 42 | casx [%o1], %g7, %g1 |
| 43 | cmp %g7, %g1 |
| 44 | bne,pn %xcc, 1b |
| 45 | and %g7, %o2, %g2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | clr %o0 |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 47 | movrne %g2, 1, %o0 |
| 48 | BITOP_POST_BARRIER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | retl |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 50 | nop |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | .size test_and_set_bit, .-test_and_set_bit |
| 52 | |
| 53 | .globl test_and_clear_bit |
| 54 | .type test_and_clear_bit,#function |
| 55 | test_and_clear_bit: /* %o0=nr, %o1=addr */ |
| 56 | BITOP_PRE_BARRIER |
| 57 | srlx %o0, 6, %g1 |
| 58 | mov 1, %o2 |
| 59 | sllx %g1, 3, %g3 |
| 60 | and %o0, 63, %g2 |
| 61 | sllx %o2, %g2, %o2 |
| 62 | add %o1, %g3, %o1 |
| 63 | 1: ldx [%o1], %g7 |
| 64 | andn %g7, %o2, %g1 |
| 65 | casx [%o1], %g7, %g1 |
| 66 | cmp %g7, %g1 |
| 67 | bne,pn %xcc, 1b |
| 68 | and %g7, %o2, %g2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | clr %o0 |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 70 | movrne %g2, 1, %o0 |
| 71 | BITOP_POST_BARRIER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | retl |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 73 | nop |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | .size test_and_clear_bit, .-test_and_clear_bit |
| 75 | |
| 76 | .globl test_and_change_bit |
| 77 | .type test_and_change_bit,#function |
| 78 | test_and_change_bit: /* %o0=nr, %o1=addr */ |
| 79 | BITOP_PRE_BARRIER |
| 80 | srlx %o0, 6, %g1 |
| 81 | mov 1, %o2 |
| 82 | sllx %g1, 3, %g3 |
| 83 | and %o0, 63, %g2 |
| 84 | sllx %o2, %g2, %o2 |
| 85 | add %o1, %g3, %o1 |
| 86 | 1: ldx [%o1], %g7 |
| 87 | xor %g7, %o2, %g1 |
| 88 | casx [%o1], %g7, %g1 |
| 89 | cmp %g7, %g1 |
| 90 | bne,pn %xcc, 1b |
| 91 | and %g7, %o2, %g2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | clr %o0 |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 93 | movrne %g2, 1, %o0 |
| 94 | BITOP_POST_BARRIER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | retl |
David S. Miller | b445e26 | 2005-06-27 15:42:04 -0700 | [diff] [blame] | 96 | nop |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | .size test_and_change_bit, .-test_and_change_bit |
| 98 | |
| 99 | .globl set_bit |
| 100 | .type set_bit,#function |
| 101 | set_bit: /* %o0=nr, %o1=addr */ |
| 102 | srlx %o0, 6, %g1 |
| 103 | mov 1, %o2 |
| 104 | sllx %g1, 3, %g3 |
| 105 | and %o0, 63, %g2 |
| 106 | sllx %o2, %g2, %o2 |
| 107 | add %o1, %g3, %o1 |
| 108 | 1: ldx [%o1], %g7 |
| 109 | or %g7, %o2, %g1 |
| 110 | casx [%o1], %g7, %g1 |
| 111 | cmp %g7, %g1 |
| 112 | bne,pn %xcc, 1b |
| 113 | nop |
| 114 | retl |
| 115 | nop |
| 116 | .size set_bit, .-set_bit |
| 117 | |
| 118 | .globl clear_bit |
| 119 | .type clear_bit,#function |
| 120 | clear_bit: /* %o0=nr, %o1=addr */ |
| 121 | srlx %o0, 6, %g1 |
| 122 | mov 1, %o2 |
| 123 | sllx %g1, 3, %g3 |
| 124 | and %o0, 63, %g2 |
| 125 | sllx %o2, %g2, %o2 |
| 126 | add %o1, %g3, %o1 |
| 127 | 1: ldx [%o1], %g7 |
| 128 | andn %g7, %o2, %g1 |
| 129 | casx [%o1], %g7, %g1 |
| 130 | cmp %g7, %g1 |
| 131 | bne,pn %xcc, 1b |
| 132 | nop |
| 133 | retl |
| 134 | nop |
| 135 | .size clear_bit, .-clear_bit |
| 136 | |
| 137 | .globl change_bit |
| 138 | .type change_bit,#function |
| 139 | change_bit: /* %o0=nr, %o1=addr */ |
| 140 | srlx %o0, 6, %g1 |
| 141 | mov 1, %o2 |
| 142 | sllx %g1, 3, %g3 |
| 143 | and %o0, 63, %g2 |
| 144 | sllx %o2, %g2, %o2 |
| 145 | add %o1, %g3, %o1 |
| 146 | 1: ldx [%o1], %g7 |
| 147 | xor %g7, %o2, %g1 |
| 148 | casx [%o1], %g7, %g1 |
| 149 | cmp %g7, %g1 |
| 150 | bne,pn %xcc, 1b |
| 151 | nop |
| 152 | retl |
| 153 | nop |
| 154 | .size change_bit, .-change_bit |