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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 <preemption.h> |
|
34 | #include <print.h> |
35 | #include <print.h> |
35 | 36 | ||
36 | #ifdef __SMP__ |
37 | #ifdef __SMP__ |
37 | 38 | ||
38 | void spinlock_initialize(spinlock_t *sl) |
39 | void spinlock_initialize(spinlock_t *sl) |
39 | { |
40 | { |
40 | sl->val = 0; |
41 | sl->val = 0; |
41 | } |
42 | } |
42 | 43 | ||
43 | #ifdef DEBUG_SPINLOCK |
44 | #ifdef DEBUG_SPINLOCK |
44 | void spinlock_lock(spinlock_t *sl) |
45 | void spinlock_lock(spinlock_t *sl) |
45 | { |
46 | { |
46 | int i = 0; |
47 | int i = 0; |
47 | __address caller = ((__u32 *) &sl)[-1]; |
48 | __address caller = ((__u32 *) &sl)[-1]; |
48 | 49 | ||
- | 50 | preemption_disable(); |
|
49 | while (test_and_set(&sl->val)) { |
51 | while (test_and_set(&sl->val)) { |
50 | if (i++ > 300000) { |
52 | if (i++ > 300000) { |
51 | printf("cpu%d: looping on spinlock %X, caller=%X\n", CPU->id, sl, caller); |
53 | printf("cpu%d: looping on spinlock %X, caller=%X\n", CPU->id, sl, caller); |
52 | i = 0; |
54 | i = 0; |
53 | } |
55 | } |
54 | } |
56 | } |
55 | CS_ENTER_BARRIER(); |
57 | CS_ENTER_BARRIER(); |
56 | 58 | ||
57 | } |
59 | } |
58 | #else |
60 | #else |
59 | void spinlock_lock(spinlock_t *sl) |
61 | void spinlock_lock(spinlock_t *sl) |
60 | { |
62 | { |
- | 63 | preemption_disable(); |
|
- | 64 | ||
61 | /* |
65 | /* |
62 | * Each architecture has its own efficient/recommended |
66 | * Each architecture has its own efficient/recommended |
63 | * implementation of spinlock. |
67 | * implementation of spinlock. |
64 | */ |
68 | */ |
65 | spinlock_arch(&sl->val); |
69 | spinlock_arch(&sl->val); |
66 | CS_ENTER_BARRIER(); |
70 | CS_ENTER_BARRIER(); |
67 | } |
71 | } |
68 | #endif |
72 | #endif |
69 | 73 | ||
70 | int spinlock_trylock(spinlock_t *sl) |
74 | int spinlock_trylock(spinlock_t *sl) |
71 | { |
75 | { |
72 | int rc; |
76 | int rc; |
73 | 77 | ||
- | 78 | preemption_disable(); |
|
74 | rc = !test_and_set(&sl->val); |
79 | rc = !test_and_set(&sl->val); |
75 | CS_ENTER_BARRIER(); |
80 | CS_ENTER_BARRIER(); |
- | 81 | ||
- | 82 | if (!rc) |
|
- | 83 | preemption_enable(); |
|
76 | 84 | ||
77 | return rc; |
85 | return rc; |
78 | } |
86 | } |
79 | 87 | ||
80 | void spinlock_unlock(spinlock_t *sl) |
88 | void spinlock_unlock(spinlock_t *sl) |
81 | { |
89 | { |
82 | CS_LEAVE_BARRIER(); |
90 | CS_LEAVE_BARRIER(); |
83 | sl->val = 0; |
91 | sl->val = 0; |
- | 92 | preemption_enable(); |
|
84 | } |
93 | } |
85 | 94 | ||
86 | #endif |
95 | #endif |
87 | 96 |