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24f287e4 | 1 | /* atomic.S: These things are too big to do inline. |
1da177e4 | 2 | * |
24f287e4 | 3 | * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | */ |
5 | ||
1da177e4 | 6 | #include <asm/asi.h> |
24f287e4 | 7 | #include <asm/backoff.h> |
1da177e4 | 8 | |
1da177e4 LT |
9 | .text |
10 | ||
11 | /* Two versions of the atomic routines, one that | |
12 | * does not return a value and does not perform | |
13 | * memory barriers, and a second which returns | |
14 | * a value and does the barriers. | |
15 | */ | |
16 | .globl atomic_add | |
17 | .type atomic_add,#function | |
18 | atomic_add: /* %o0 = increment, %o1 = atomic_ptr */ | |
24f287e4 | 19 | BACKOFF_SETUP(%o2) |
1da177e4 LT |
20 | 1: lduw [%o1], %g1 |
21 | add %g1, %o0, %g7 | |
22 | cas [%o1], %g1, %g7 | |
23 | cmp %g1, %g7 | |
24f287e4 | 24 | bne,pn %icc, 2f |
1da177e4 LT |
25 | nop |
26 | retl | |
27 | nop | |
24f287e4 | 28 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
1da177e4 LT |
29 | .size atomic_add, .-atomic_add |
30 | ||
31 | .globl atomic_sub | |
32 | .type atomic_sub,#function | |
33 | atomic_sub: /* %o0 = decrement, %o1 = atomic_ptr */ | |
24f287e4 | 34 | BACKOFF_SETUP(%o2) |
1da177e4 LT |
35 | 1: lduw [%o1], %g1 |
36 | sub %g1, %o0, %g7 | |
37 | cas [%o1], %g1, %g7 | |
38 | cmp %g1, %g7 | |
24f287e4 | 39 | bne,pn %icc, 2f |
1da177e4 LT |
40 | nop |
41 | retl | |
42 | nop | |
24f287e4 | 43 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
1da177e4 LT |
44 | .size atomic_sub, .-atomic_sub |
45 | ||
46 | .globl atomic_add_ret | |
47 | .type atomic_add_ret,#function | |
48 | atomic_add_ret: /* %o0 = increment, %o1 = atomic_ptr */ | |
24f287e4 | 49 | BACKOFF_SETUP(%o2) |
1da177e4 LT |
50 | 1: lduw [%o1], %g1 |
51 | add %g1, %o0, %g7 | |
52 | cas [%o1], %g1, %g7 | |
53 | cmp %g1, %g7 | |
24f287e4 | 54 | bne,pn %icc, 2f |
1da177e4 | 55 | add %g7, %o0, %g7 |
b445e26c | 56 | sra %g7, 0, %o0 |
1da177e4 | 57 | retl |
b445e26c | 58 | nop |
24f287e4 | 59 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
1da177e4 LT |
60 | .size atomic_add_ret, .-atomic_add_ret |
61 | ||
62 | .globl atomic_sub_ret | |
63 | .type atomic_sub_ret,#function | |
64 | atomic_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */ | |
24f287e4 | 65 | BACKOFF_SETUP(%o2) |
1da177e4 LT |
66 | 1: lduw [%o1], %g1 |
67 | sub %g1, %o0, %g7 | |
68 | cas [%o1], %g1, %g7 | |
69 | cmp %g1, %g7 | |
24f287e4 | 70 | bne,pn %icc, 2f |
1da177e4 | 71 | sub %g7, %o0, %g7 |
b445e26c | 72 | sra %g7, 0, %o0 |
1da177e4 | 73 | retl |
b445e26c | 74 | nop |
24f287e4 | 75 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
1da177e4 LT |
76 | .size atomic_sub_ret, .-atomic_sub_ret |
77 | ||
78 | .globl atomic64_add | |
79 | .type atomic64_add,#function | |
80 | atomic64_add: /* %o0 = increment, %o1 = atomic_ptr */ | |
24f287e4 | 81 | BACKOFF_SETUP(%o2) |
1da177e4 LT |
82 | 1: ldx [%o1], %g1 |
83 | add %g1, %o0, %g7 | |
84 | casx [%o1], %g1, %g7 | |
85 | cmp %g1, %g7 | |
24f287e4 | 86 | bne,pn %xcc, 2f |
1da177e4 LT |
87 | nop |
88 | retl | |
89 | nop | |
24f287e4 | 90 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
1da177e4 LT |
91 | .size atomic64_add, .-atomic64_add |
92 | ||
93 | .globl atomic64_sub | |
94 | .type atomic64_sub,#function | |
95 | atomic64_sub: /* %o0 = decrement, %o1 = atomic_ptr */ | |
24f287e4 | 96 | BACKOFF_SETUP(%o2) |
1da177e4 LT |
97 | 1: ldx [%o1], %g1 |
98 | sub %g1, %o0, %g7 | |
99 | casx [%o1], %g1, %g7 | |
100 | cmp %g1, %g7 | |
24f287e4 | 101 | bne,pn %xcc, 2f |
1da177e4 LT |
102 | nop |
103 | retl | |
104 | nop | |
24f287e4 | 105 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
1da177e4 LT |
106 | .size atomic64_sub, .-atomic64_sub |
107 | ||
108 | .globl atomic64_add_ret | |
109 | .type atomic64_add_ret,#function | |
110 | atomic64_add_ret: /* %o0 = increment, %o1 = atomic_ptr */ | |
24f287e4 | 111 | BACKOFF_SETUP(%o2) |
1da177e4 LT |
112 | 1: ldx [%o1], %g1 |
113 | add %g1, %o0, %g7 | |
114 | casx [%o1], %g1, %g7 | |
115 | cmp %g1, %g7 | |
24f287e4 | 116 | bne,pn %xcc, 2f |
1da177e4 | 117 | add %g7, %o0, %g7 |
b445e26c | 118 | mov %g7, %o0 |
1da177e4 | 119 | retl |
b445e26c | 120 | nop |
24f287e4 | 121 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
1da177e4 LT |
122 | .size atomic64_add_ret, .-atomic64_add_ret |
123 | ||
124 | .globl atomic64_sub_ret | |
125 | .type atomic64_sub_ret,#function | |
126 | atomic64_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */ | |
24f287e4 | 127 | BACKOFF_SETUP(%o2) |
1da177e4 LT |
128 | 1: ldx [%o1], %g1 |
129 | sub %g1, %o0, %g7 | |
130 | casx [%o1], %g1, %g7 | |
131 | cmp %g1, %g7 | |
24f287e4 | 132 | bne,pn %xcc, 2f |
1da177e4 | 133 | sub %g7, %o0, %g7 |
b445e26c | 134 | mov %g7, %o0 |
1da177e4 | 135 | retl |
b445e26c | 136 | nop |
24f287e4 | 137 | 2: BACKOFF_SPIN(%o2, %o3, 1b) |
1da177e4 | 138 | .size atomic64_sub_ret, .-atomic64_sub_ret |