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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 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 | #include <arch.h> |
29 | #include <arch.h> |
| 30 | 30 | ||
| 31 | #include <arch/atomic.h> |
31 | #include <arch/atomic.h> |
| 32 | #include <arch/barrier.h> |
32 | #include <arch/barrier.h> |
| 33 | #include <synch/spinlock.h> |
33 | #include <synch/spinlock.h> |
| - | 34 | #include <print.h> |
|
| 34 | 35 | ||
| 35 | #ifdef __SMP__ |
36 | #ifdef __SMP__ |
| 36 | 37 | ||
| 37 | void spinlock_initialize(spinlock_t *sl) |
38 | void spinlock_initialize(spinlock_t *sl) |
| 38 | { |
39 | { |
| 39 | sl->val = 0; |
40 | sl->val = 0; |
| 40 | } |
41 | } |
| 41 | 42 | ||
| 42 | #ifdef DEBUG_SPINLOCK |
43 | #ifdef DEBUG_SPINLOCK |
| 43 | void spinlock_lock(spinlock_t *sl) |
44 | void spinlock_lock(spinlock_t *sl) |
| 44 | { |
45 | { |
| 45 | int i = 0; |
46 | int i = 0; |
| 46 | __address caller = ((__u32 *) &sl)[-1]; |
47 | __address caller = ((__u32 *) &sl)[-1]; |
| 47 | 48 | ||
| 48 | while (test_and_set(&sl->val)) { |
49 | while (test_and_set(&sl->val)) { |
| 49 | if (i++ > 300000) { |
50 | if (i++ > 300000) { |
| 50 | printf("cpu%d: looping on spinlock %X, caller=%X\n", CPU->id, sl, caller); |
51 | printf("cpu%d: looping on spinlock %X, caller=%X\n", CPU->id, sl, caller); |
| 51 | i = 0; |
52 | i = 0; |
| 52 | } |
53 | } |
| 53 | } |
54 | } |
| 54 | CS_ENTER_BARRIER(); |
55 | CS_ENTER_BARRIER(); |
| 55 | 56 | ||
| 56 | } |
57 | } |
| 57 | #else |
58 | #else |
| 58 | void spinlock_lock(spinlock_t *sl) |
59 | void spinlock_lock(spinlock_t *sl) |
| 59 | { |
60 | { |
| 60 | /* |
61 | /* |
| 61 | * Each architecture has its own efficient/recommended |
62 | * Each architecture has its own efficient/recommended |
| 62 | * implementation of spinlock. |
63 | * implementation of spinlock. |
| 63 | */ |
64 | */ |
| 64 | spinlock_arch(&sl->val); |
65 | spinlock_arch(&sl->val); |
| 65 | CS_ENTER_BARRIER(); |
66 | CS_ENTER_BARRIER(); |
| 66 | } |
67 | } |
| 67 | #endif |
68 | #endif |
| 68 | 69 | ||
| 69 | int spinlock_trylock(spinlock_t *sl) |
70 | int spinlock_trylock(spinlock_t *sl) |
| 70 | { |
71 | { |
| 71 | int rc; |
72 | int rc; |
| 72 | 73 | ||
| 73 | rc = !test_and_set(&sl->val); |
74 | rc = !test_and_set(&sl->val); |
| 74 | CS_ENTER_BARRIER(); |
75 | CS_ENTER_BARRIER(); |
| 75 | 76 | ||
| 76 | return rc; |
77 | return rc; |
| 77 | } |
78 | } |
| 78 | 79 | ||
| 79 | void spinlock_unlock(spinlock_t *sl) |
80 | void spinlock_unlock(spinlock_t *sl) |
| 80 | { |
81 | { |
| 81 | CS_LEAVE_BARRIER(); |
82 | CS_LEAVE_BARRIER(); |
| 82 | sl->val = 0; |
83 | sl->val = 0; |
| 83 | } |
84 | } |
| 84 | 85 | ||
| 85 | #endif |
86 | #endif |
| 86 | 87 | ||