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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 | #ifndef __ia32_BARRIER_H__ |
29 | #ifndef __ia32_BARRIER_H__ |
30 | #define __ia32_BARRIER_H__ |
30 | #define __ia32_BARRIER_H__ |
31 | 31 | ||
32 | /* |
32 | /* |
33 | * NOTE: |
33 | * NOTE: |
34 | * No barriers for critical section (i.e. spinlock) on IA-32 are needed: |
34 | * No barriers for critical section (i.e. spinlock) on IA-32 are needed: |
35 | * - spinlock_lock() and spinlock_trylock() use serializing XCHG instruction |
35 | * - spinlock_lock() and spinlock_trylock() use serializing XCHG instruction |
36 | * - writes cannot pass reads on IA-32 => spinlock_unlock() needs no barriers |
36 | * - writes cannot pass reads on IA-32 => spinlock_unlock() needs no barriers |
37 | */ |
37 | */ |
38 | 38 | ||
39 | /* |
39 | /* |
40 | * Provisions are made to prevent compiler from reordering instructions itself. |
40 | * Provisions are made to prevent compiler from reordering instructions itself. |
41 | */ |
41 | */ |
42 | 42 | ||
43 | #define CS_ENTER_BARRIER() __asm__ volatile ("" ::: "memory") |
43 | #define CS_ENTER_BARRIER() __asm__ volatile ("" ::: "memory") |
44 | #define CS_LEAVE_BARRIER() __asm__ volatile ("" ::: "memory") |
44 | #define CS_LEAVE_BARRIER() __asm__ volatile ("" ::: "memory") |
45 | 45 | ||
46 | #if (FENCES == p4) |
46 | #ifdef CONFIG_FENCES_P4 |
47 | # define memory_barrier() __asm__ volatile ("mfence\n" ::: "memory") |
47 | # define memory_barrier() __asm__ volatile ("mfence\n" ::: "memory") |
48 | # define read_barrier() __asm__ volatile ("sfence\n" ::: "memory") |
48 | # define read_barrier() __asm__ volatile ("lfence\n" ::: "memory") |
49 | # define write_barrier() __asm__ volatile ("lfence\n" ::: "memory") |
49 | # define write_barrier() __asm__ volatile ("sfence\n" ::: "memory") |
50 | #elif (FENCES == p3) |
50 | #elif CONFIG_FENCES_P3 |
51 | # define memory_barrier() __asm__ volatile ("xchgl %%eax,%%eax\n" ::: "memory") |
51 | # define memory_barrier() __asm__ volatile ("\n" ::: "memory") |
52 | # define read_barrier() __asm__ volatile ("sfence\n" ::: "memory") |
52 | # define read_barrier() __asm__ volatile ("\n" ::: "memory") |
53 | # define write_barrier() __asm__ volatile ("xchgl %%eax,%%eax\n" ::: "memory") |
53 | # define write_barrier() __asm__ volatile ("sfence\n" ::: "memory") |
54 | #else |
- | |
55 | # error Unsupported FENCES value |
- | |
56 | #endif |
54 | #endif |
57 | 55 | ||
58 | #endif |
56 | #endif |
59 | 57 |