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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 | /** |
|
- | 30 | * @file ipi.c |
|
- | 31 | * @brief Generic IPI interface. |
|
- | 32 | */ |
|
- | 33 | ||
29 | #ifdef CONFIG_SMP |
34 | #ifdef CONFIG_SMP |
30 | 35 | ||
31 | #include <smp/ipi.h> |
36 | #include <smp/ipi.h> |
32 | #include <config.h> |
37 | #include <config.h> |
33 | 38 | ||
34 | 39 | ||
35 | /** Broadcast IPI message |
40 | /** Broadcast IPI message |
36 | * |
41 | * |
37 | * Broadcast IPI message to all CPUs. |
42 | * Broadcast IPI message to all CPUs. |
38 | * |
43 | * |
39 | * @param ipi Message to broadcast. |
44 | * @param ipi Message to broadcast. |
40 | * |
45 | * |
- | 46 | * @bugs The decision whether to actually send the IPI must be based |
|
- | 47 | * on a different criterion. The current version has |
|
- | 48 | * problems when some of the detected CPUs are marked |
|
- | 49 | * disabled in machine configuration. |
|
41 | */ |
50 | */ |
42 | void ipi_broadcast(int ipi) |
51 | void ipi_broadcast(int ipi) |
43 | { |
52 | { |
44 | /* |
53 | /* |
45 | * Provisions must be made to avoid sending IPI: |
54 | * Provisions must be made to avoid sending IPI: |
46 | * - before all CPU's were configured to accept the IPI |
55 | * - before all CPU's were configured to accept the IPI |
47 | * - if there is only one CPU but the kernel was compiled with CONFIG_SMP |
56 | * - if there is only one CPU but the kernel was compiled with CONFIG_SMP |
48 | */ |
57 | */ |
49 | 58 | ||
50 | if ((config.cpu_active > 1) && (config.cpu_active == config.cpu_count)) |
59 | if ((config.cpu_active > 1) && (config.cpu_active == config.cpu_count)) |
51 | ipi_broadcast_arch(ipi); |
60 | ipi_broadcast_arch(ipi); |
52 | } |
61 | } |
53 | 62 | ||
54 | #endif /* CONFIG_SMP */ |
63 | #endif /* CONFIG_SMP */ |
55 | 64 |