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1 | /* |
1 | /* |
2 | * Copyright (c) 2005 Jakub Jermar |
2 | * Copyright (c) 2005 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup ia64 |
29 | /** @addtogroup ia64 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #ifndef KERN_ia64_ATOMIC_H_ |
35 | #ifndef KERN_ia64_ATOMIC_H_ |
36 | #define KERN_ia64_ATOMIC_H_ |
36 | #define KERN_ia64_ATOMIC_H_ |
37 | 37 | ||
38 | /** Atomic addition. |
38 | /** Atomic addition. |
39 | * |
39 | * |
40 | * @param val Atomic value. |
40 | * @param val Atomic value. |
41 | * @param imm Value to add. |
41 | * @param imm Value to add. |
42 | * |
42 | * |
43 | * @return Value before addition. |
43 | * @return Value before addition. |
44 | */ |
44 | */ |
45 | static inline long atomic_add(atomic_t *val, int imm) |
45 | static inline long atomic_add(atomic_t *val, int imm) |
46 | { |
46 | { |
47 | long v; |
47 | long v; |
48 | 48 | ||
49 | asm volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v), |
49 | asm volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v), |
50 | "+m" (val->count) : "i" (imm)); |
50 | "+m" (val->count) : "i" (imm)); |
51 | 51 | ||
52 | return v; |
52 | return v; |
53 | } |
53 | } |
54 | 54 | ||
55 | - | ||
56 | static inline uint64_t test_and_set(atomic_t *val) { |
55 | static inline uint64_t test_and_set(atomic_t *val) |
- | 56 | { |
|
57 | uint64_t v; |
57 | uint64_t v; |
58 | 58 | ||
59 | asm volatile ( |
59 | asm volatile ( |
60 | "movl %0 = 0x01;;\n" |
60 | "movl %0 = 0x1;;\n" |
61 | "xchg8 %0 = %1, %0;;\n" |
61 | "xchg8 %0 = %1, %0;;\n" |
62 | : "=r" (v), "+m" (val->count) |
62 | : "=r" (v), "+m" (val->count) |
63 | ); |
63 | ); |
64 | 64 | ||
65 | return v; |
65 | return v; |
66 | } |
66 | } |
67 | 67 | ||
- | 68 | static inline void atomic_lock_arch(atomic_t *val) |
|
- | 69 | { |
|
- | 70 | do { |
|
- | 71 | while (val->count) |
|
- | 72 | ; |
|
- | 73 | } while (test_and_set(val)); |
|
- | 74 | } |
|
68 | 75 | ||
69 | static inline void atomic_inc(atomic_t *val) |
76 | static inline void atomic_inc(atomic_t *val) |
70 | { |
77 | { |
71 | atomic_add(val, 1); |
78 | atomic_add(val, 1); |
72 | } |
79 | } |
73 | 80 | ||
74 | static inline void atomic_dec(atomic_t *val) |
81 | static inline void atomic_dec(atomic_t *val) |
75 | { |
82 | { |
76 | atomic_add(val, -1); |
83 | atomic_add(val, -1); |
77 | } |
84 | } |
78 | 85 | ||
79 | static inline long atomic_preinc(atomic_t *val) |
86 | static inline long atomic_preinc(atomic_t *val) |
80 | { |
87 | { |
81 | return atomic_add(val, 1) + 1; |
88 | return atomic_add(val, 1) + 1; |
82 | } |
89 | } |
83 | 90 | ||
84 | static inline long atomic_predec(atomic_t *val) |
91 | static inline long atomic_predec(atomic_t *val) |
85 | { |
92 | { |
86 | return atomic_add(val, -1) - 1; |
93 | return atomic_add(val, -1) - 1; |
87 | } |
94 | } |
88 | 95 | ||
89 | static inline long atomic_postinc(atomic_t *val) |
96 | static inline long atomic_postinc(atomic_t *val) |
90 | { |
97 | { |
91 | return atomic_add(val, 1); |
98 | return atomic_add(val, 1); |
92 | } |
99 | } |
93 | 100 | ||
94 | static inline long atomic_postdec(atomic_t *val) |
101 | static inline long atomic_postdec(atomic_t *val) |
95 | { |
102 | { |
96 | return atomic_add(val, -1); |
103 | return atomic_add(val, -1); |
97 | } |
104 | } |
98 | 105 | ||
99 | #endif |
106 | #endif |
100 | 107 | ||
101 | /** @} |
108 | /** @} |
102 | */ |
109 | */ |
103 | 110 |