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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> |
d3867f04 | 9 | #include <asm/export.h> |
1da177e4 | 10 | |
1da177e4 LT |
11 | .text |
12 | ||
3a1adb23 | 13 | /* Three versions of the atomic routines, one that |
1da177e4 | 14 | * does not return a value and does not perform |
3a1adb23 PZ |
15 | * memory barriers, and a two which return |
16 | * a value, the new and old value resp. and does the | |
17 | * barriers. | |
1da177e4 | 18 | */ |
1da177e4 | 19 | |
4f3316c2 PZ |
20 | #define ATOMIC_OP(op) \ |
21 | ENTRY(atomic_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
22 | BACKOFF_SETUP(%o2); \ | |
23 | 1: lduw [%o1], %g1; \ | |
24 | op %g1, %o0, %g7; \ | |
25 | cas [%o1], %g1, %g7; \ | |
26 | cmp %g1, %g7; \ | |
27 | bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ | |
28 | nop; \ | |
29 | retl; \ | |
30 | nop; \ | |
31 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ | |
32 | ENDPROC(atomic_##op); \ | |
d3867f04 | 33 | EXPORT_SYMBOL(atomic_##op); |
1da177e4 | 34 | |
4f3316c2 PZ |
35 | #define ATOMIC_OP_RETURN(op) \ |
36 | ENTRY(atomic_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
37 | BACKOFF_SETUP(%o2); \ | |
38 | 1: lduw [%o1], %g1; \ | |
39 | op %g1, %o0, %g7; \ | |
40 | cas [%o1], %g1, %g7; \ | |
41 | cmp %g1, %g7; \ | |
42 | bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ | |
caa17d49 | 43 | op %g1, %o0, %g1; \ |
4f3316c2 PZ |
44 | retl; \ |
45 | sra %g1, 0, %o0; \ | |
46 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ | |
d3867f04 AV |
47 | ENDPROC(atomic_##op##_return); \ |
48 | EXPORT_SYMBOL(atomic_##op##_return); | |
1da177e4 | 49 | |
3a1adb23 PZ |
50 | #define ATOMIC_FETCH_OP(op) \ |
51 | ENTRY(atomic_fetch_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
52 | BACKOFF_SETUP(%o2); \ | |
53 | 1: lduw [%o1], %g1; \ | |
54 | op %g1, %o0, %g7; \ | |
55 | cas [%o1], %g1, %g7; \ | |
56 | cmp %g1, %g7; \ | |
57 | bne,pn %icc, BACKOFF_LABEL(2f, 1b); \ | |
58 | nop; \ | |
59 | retl; \ | |
60 | sra %g1, 0, %o0; \ | |
61 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ | |
d3867f04 AV |
62 | ENDPROC(atomic_fetch_##op); \ |
63 | EXPORT_SYMBOL(atomic_fetch_##op); | |
3a1adb23 PZ |
64 | |
65 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op) | |
1da177e4 | 66 | |
4f3316c2 PZ |
67 | ATOMIC_OPS(add) |
68 | ATOMIC_OPS(sub) | |
1da177e4 | 69 | |
4f3316c2 | 70 | #undef ATOMIC_OPS |
3a1adb23 PZ |
71 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op) |
72 | ||
73 | ATOMIC_OPS(and) | |
74 | ATOMIC_OPS(or) | |
75 | ATOMIC_OPS(xor) | |
76 | ||
77 | #undef ATOMIC_OPS | |
78 | #undef ATOMIC_FETCH_OP | |
4f3316c2 PZ |
79 | #undef ATOMIC_OP_RETURN |
80 | #undef ATOMIC_OP | |
1da177e4 | 81 | |
4f3316c2 PZ |
82 | #define ATOMIC64_OP(op) \ |
83 | ENTRY(atomic64_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
84 | BACKOFF_SETUP(%o2); \ | |
85 | 1: ldx [%o1], %g1; \ | |
86 | op %g1, %o0, %g7; \ | |
87 | casx [%o1], %g1, %g7; \ | |
88 | cmp %g1, %g7; \ | |
89 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ | |
90 | nop; \ | |
91 | retl; \ | |
92 | nop; \ | |
93 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ | |
94 | ENDPROC(atomic64_##op); \ | |
d3867f04 | 95 | EXPORT_SYMBOL(atomic64_##op); |
1da177e4 | 96 | |
4f3316c2 PZ |
97 | #define ATOMIC64_OP_RETURN(op) \ |
98 | ENTRY(atomic64_##op##_return) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
99 | BACKOFF_SETUP(%o2); \ | |
100 | 1: ldx [%o1], %g1; \ | |
101 | op %g1, %o0, %g7; \ | |
102 | casx [%o1], %g1, %g7; \ | |
103 | cmp %g1, %g7; \ | |
104 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ | |
105 | nop; \ | |
106 | retl; \ | |
caa17d49 | 107 | op %g1, %o0, %o0; \ |
4f3316c2 | 108 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ |
d3867f04 AV |
109 | ENDPROC(atomic64_##op##_return); \ |
110 | EXPORT_SYMBOL(atomic64_##op##_return); | |
4f3316c2 | 111 | |
3a1adb23 PZ |
112 | #define ATOMIC64_FETCH_OP(op) \ |
113 | ENTRY(atomic64_fetch_##op) /* %o0 = increment, %o1 = atomic_ptr */ \ | |
114 | BACKOFF_SETUP(%o2); \ | |
115 | 1: ldx [%o1], %g1; \ | |
116 | op %g1, %o0, %g7; \ | |
117 | casx [%o1], %g1, %g7; \ | |
118 | cmp %g1, %g7; \ | |
119 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b); \ | |
120 | nop; \ | |
121 | retl; \ | |
122 | mov %g1, %o0; \ | |
123 | 2: BACKOFF_SPIN(%o2, %o3, 1b); \ | |
d3867f04 AV |
124 | ENDPROC(atomic64_fetch_##op); \ |
125 | EXPORT_SYMBOL(atomic64_fetch_##op); | |
3a1adb23 PZ |
126 | |
127 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) | |
4f3316c2 PZ |
128 | |
129 | ATOMIC64_OPS(add) | |
130 | ATOMIC64_OPS(sub) | |
131 | ||
132 | #undef ATOMIC64_OPS | |
3a1adb23 PZ |
133 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) |
134 | ||
135 | ATOMIC64_OPS(and) | |
136 | ATOMIC64_OPS(or) | |
137 | ATOMIC64_OPS(xor) | |
138 | ||
139 | #undef ATOMIC64_OPS | |
140 | #undef ATOMIC64_FETCH_OP | |
4f3316c2 PZ |
141 | #undef ATOMIC64_OP_RETURN |
142 | #undef ATOMIC64_OP | |
193d2aad DM |
143 | |
144 | ENTRY(atomic64_dec_if_positive) /* %o0 = atomic_ptr */ | |
145 | BACKOFF_SETUP(%o2) | |
146 | 1: ldx [%o0], %g1 | |
147 | brlez,pn %g1, 3f | |
148 | sub %g1, 1, %g7 | |
149 | casx [%o0], %g1, %g7 | |
150 | cmp %g1, %g7 | |
151 | bne,pn %xcc, BACKOFF_LABEL(2f, 1b) | |
152 | nop | |
153 | 3: retl | |
154 | sub %g1, 1, %o0 | |
155 | 2: BACKOFF_SPIN(%o2, %o3, 1b) | |
156 | ENDPROC(atomic64_dec_if_positive) | |
d3867f04 | 157 | EXPORT_SYMBOL(atomic64_dec_if_positive) |