Rev 2015 | Go to most recent revision | Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
2009 | jermar | 1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
||
3 | * All rights reserved. |
||
4 | * |
||
5 | * Redistribution and use in source and binary forms, with or without |
||
6 | * modification, are permitted provided that the following conditions |
||
7 | * are met: |
||
8 | * |
||
9 | * - Redistributions of source code must retain the above copyright |
||
10 | * notice, this list of conditions and the following disclaimer. |
||
11 | * - Redistributions in binary form must reproduce the above copyright |
||
12 | * notice, this list of conditions and the following disclaimer in the |
||
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 |
||
15 | * derived from this software without specific prior written permission. |
||
16 | * |
||
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 |
||
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
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 |
||
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 |
||
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
27 | */ |
||
28 | |||
29 | /** @addtogroup sparc64mm |
||
30 | * @{ |
||
31 | */ |
||
32 | /** |
||
33 | * @file |
||
34 | * @brief D-cache shootdown algorithm. |
||
35 | */ |
||
36 | |||
37 | #include <arch/mm/cache.h> |
||
38 | |||
39 | #ifdef CONFIG_SMP |
||
40 | |||
41 | #include <smp/ipi.h> |
||
42 | #include <arch/interrupt.h> |
||
43 | #include <synch/spinlock.h> |
||
44 | #include <arch.h> |
||
45 | #include <debug.h> |
||
46 | |||
47 | /** |
||
48 | * This spinlock is used by the processors to synchronize during the D-cache |
||
49 | * shootdown. |
||
50 | */ |
||
51 | SPINLOCK_INITIALIZE(dcachelock); |
||
52 | |||
53 | /** Initialize the D-cache shootdown sequence. |
||
54 | * |
||
55 | * Start the shootdown sequence by sending out an IPI and wait until all |
||
56 | * processors spin on the dcachelock spinlock. |
||
57 | */ |
||
58 | void dcache_shootdown_start(void) |
||
59 | { |
||
60 | int i; |
||
61 | |||
62 | CPU->arch.dcache_active = 0; |
||
63 | spinlock_lock(&dcachelock); |
||
64 | |||
65 | ipi_broadcast(IPI_DCACHE_SHOOTDOWN); |
||
66 | |||
67 | busy_wait: |
||
68 | for (i = 0; i < config.cpu_count; i++) |
||
69 | if (cpus[i].arch.dcache_active) |
||
70 | goto busy_wait; |
||
71 | } |
||
72 | |||
73 | /** Finish the D-cache shootdown sequence. */ |
||
74 | void dcache_shootdown_finalize(void) |
||
75 | { |
||
76 | spinlock_unlock(&dcachelock); |
||
77 | CPU->arch.dcache_active = 1; |
||
78 | } |
||
79 | |||
80 | /** Process the D-cache shootdown IPI. */ |
||
81 | void dcache_shootdown_ipi_recv(void) |
||
82 | { |
||
83 | ASSERT(CPU); |
||
84 | |||
85 | CPU->arch.dcache_active = 0; |
||
86 | spinlock_lock(&dcachelock); |
||
87 | spinlock_unlock(&dcachelock); |
||
88 | |||
89 | dcache_flush(); |
||
90 | |||
91 | CPU->arch.dcache_active = 1; |
||
92 | } |
||
93 | |||
94 | #endif /* CONFIG_SMP */ |
||
95 | |||
96 | /** @} |
||
97 | */ |
||
98 |