diff options
Diffstat (limited to 'arch/sparc64/lib/bitops.S')
| -rw-r--r-- | arch/sparc64/lib/bitops.S | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/arch/sparc64/lib/bitops.S b/arch/sparc64/lib/bitops.S new file mode 100644 index 000000000000..886dcd2b376a --- /dev/null +++ b/arch/sparc64/lib/bitops.S | |||
| @@ -0,0 +1,145 @@ | |||
| 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 | |||
| 10 | /* On SMP we need to use memory barriers to ensure | ||
| 11 | * correct memory operation ordering, nop these out | ||
| 12 | * for uniprocessor. | ||
| 13 | */ | ||
| 14 | #ifdef CONFIG_SMP | ||
| 15 | #define BITOP_PRE_BARRIER membar #StoreLoad | #LoadLoad | ||
| 16 | #define BITOP_POST_BARRIER membar #StoreLoad | #StoreStore | ||
| 17 | #else | ||
| 18 | #define BITOP_PRE_BARRIER nop | ||
| 19 | #define BITOP_POST_BARRIER nop | ||
| 20 | #endif | ||
| 21 | |||
| 22 | .text | ||
| 23 | |||
| 24 | .globl test_and_set_bit | ||
| 25 | .type test_and_set_bit,#function | ||
| 26 | test_and_set_bit: /* %o0=nr, %o1=addr */ | ||
| 27 | BITOP_PRE_BARRIER | ||
| 28 | srlx %o0, 6, %g1 | ||
| 29 | mov 1, %o2 | ||
| 30 | sllx %g1, 3, %g3 | ||
| 31 | and %o0, 63, %g2 | ||
| 32 | sllx %o2, %g2, %o2 | ||
| 33 | add %o1, %g3, %o1 | ||
| 34 | 1: ldx [%o1], %g7 | ||
| 35 | or %g7, %o2, %g1 | ||
| 36 | casx [%o1], %g7, %g1 | ||
| 37 | cmp %g7, %g1 | ||
| 38 | bne,pn %xcc, 1b | ||
| 39 | and %g7, %o2, %g2 | ||
| 40 | BITOP_POST_BARRIER | ||
| 41 | clr %o0 | ||
| 42 | retl | ||
| 43 | movrne %g2, 1, %o0 | ||
| 44 | .size test_and_set_bit, .-test_and_set_bit | ||
| 45 | |||
| 46 | .globl test_and_clear_bit | ||
| 47 | .type test_and_clear_bit,#function | ||
| 48 | test_and_clear_bit: /* %o0=nr, %o1=addr */ | ||
| 49 | BITOP_PRE_BARRIER | ||
| 50 | srlx %o0, 6, %g1 | ||
| 51 | mov 1, %o2 | ||
| 52 | sllx %g1, 3, %g3 | ||
| 53 | and %o0, 63, %g2 | ||
| 54 | sllx %o2, %g2, %o2 | ||
| 55 | add %o1, %g3, %o1 | ||
| 56 | 1: ldx [%o1], %g7 | ||
| 57 | andn %g7, %o2, %g1 | ||
| 58 | casx [%o1], %g7, %g1 | ||
| 59 | cmp %g7, %g1 | ||
| 60 | bne,pn %xcc, 1b | ||
| 61 | and %g7, %o2, %g2 | ||
| 62 | BITOP_POST_BARRIER | ||
| 63 | clr %o0 | ||
| 64 | retl | ||
| 65 | movrne %g2, 1, %o0 | ||
| 66 | .size test_and_clear_bit, .-test_and_clear_bit | ||
| 67 | |||
| 68 | .globl test_and_change_bit | ||
| 69 | .type test_and_change_bit,#function | ||
| 70 | test_and_change_bit: /* %o0=nr, %o1=addr */ | ||
| 71 | BITOP_PRE_BARRIER | ||
| 72 | srlx %o0, 6, %g1 | ||
| 73 | mov 1, %o2 | ||
| 74 | sllx %g1, 3, %g3 | ||
| 75 | and %o0, 63, %g2 | ||
| 76 | sllx %o2, %g2, %o2 | ||
| 77 | add %o1, %g3, %o1 | ||
| 78 | 1: ldx [%o1], %g7 | ||
| 79 | xor %g7, %o2, %g1 | ||
| 80 | casx [%o1], %g7, %g1 | ||
| 81 | cmp %g7, %g1 | ||
| 82 | bne,pn %xcc, 1b | ||
| 83 | and %g7, %o2, %g2 | ||
| 84 | BITOP_POST_BARRIER | ||
| 85 | clr %o0 | ||
| 86 | retl | ||
| 87 | movrne %g2, 1, %o0 | ||
| 88 | .size test_and_change_bit, .-test_and_change_bit | ||
| 89 | |||
| 90 | .globl set_bit | ||
| 91 | .type set_bit,#function | ||
| 92 | set_bit: /* %o0=nr, %o1=addr */ | ||
| 93 | srlx %o0, 6, %g1 | ||
| 94 | mov 1, %o2 | ||
| 95 | sllx %g1, 3, %g3 | ||
| 96 | and %o0, 63, %g2 | ||
| 97 | sllx %o2, %g2, %o2 | ||
| 98 | add %o1, %g3, %o1 | ||
| 99 | 1: ldx [%o1], %g7 | ||
| 100 | or %g7, %o2, %g1 | ||
| 101 | casx [%o1], %g7, %g1 | ||
| 102 | cmp %g7, %g1 | ||
| 103 | bne,pn %xcc, 1b | ||
| 104 | nop | ||
| 105 | retl | ||
| 106 | nop | ||
| 107 | .size set_bit, .-set_bit | ||
| 108 | |||
| 109 | .globl clear_bit | ||
| 110 | .type clear_bit,#function | ||
| 111 | clear_bit: /* %o0=nr, %o1=addr */ | ||
| 112 | srlx %o0, 6, %g1 | ||
| 113 | mov 1, %o2 | ||
| 114 | sllx %g1, 3, %g3 | ||
| 115 | and %o0, 63, %g2 | ||
| 116 | sllx %o2, %g2, %o2 | ||
| 117 | add %o1, %g3, %o1 | ||
| 118 | 1: ldx [%o1], %g7 | ||
| 119 | andn %g7, %o2, %g1 | ||
| 120 | casx [%o1], %g7, %g1 | ||
| 121 | cmp %g7, %g1 | ||
| 122 | bne,pn %xcc, 1b | ||
| 123 | nop | ||
| 124 | retl | ||
| 125 | nop | ||
| 126 | .size clear_bit, .-clear_bit | ||
| 127 | |||
| 128 | .globl change_bit | ||
| 129 | .type change_bit,#function | ||
| 130 | change_bit: /* %o0=nr, %o1=addr */ | ||
| 131 | srlx %o0, 6, %g1 | ||
| 132 | mov 1, %o2 | ||
| 133 | sllx %g1, 3, %g3 | ||
| 134 | and %o0, 63, %g2 | ||
| 135 | sllx %o2, %g2, %o2 | ||
| 136 | add %o1, %g3, %o1 | ||
| 137 | 1: ldx [%o1], %g7 | ||
| 138 | xor %g7, %o2, %g1 | ||
| 139 | casx [%o1], %g7, %g1 | ||
| 140 | cmp %g7, %g1 | ||
| 141 | bne,pn %xcc, 1b | ||
| 142 | nop | ||
| 143 | retl | ||
| 144 | nop | ||
| 145 | .size change_bit, .-change_bit | ||