Try to catch double-free bugs in the ACPI code. For now generate a warning
[dragonfly.git] / sys / dev / acpica5 / Osd / OsdCache.c
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1/*
2 * Copyright (c) 2006 Jeffrey M. Hsu. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Jeffrey M. Hsu.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of The DragonFly Project nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific, prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
81a9c16c 32 * $DragonFly: src/sys/dev/acpica5/Osd/OsdCache.c,v 1.3 2007/03/20 00:56:30 dillon Exp $
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33 */
34
35#include <sys/objcache.h>
36
37struct acpicache {
38 struct objcache *cache;
39 struct objcache_malloc_args args;
40};
41
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42/*
43 * Add some magic numbers to catch double-frees earlier rather
44 * then later.
45 */
46struct acpiobjhead {
47 int state;
48 int unused;
49};
50
51#define TRACK_ALLOCATED 0x7AF45533
52#define TRACK_FREED 0x7B056644
53
54#define OBJHEADSIZE sizeof(struct acpiobjhead)
55
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56#include "acpi.h"
57
58#ifndef ACPI_USE_LOCAL_CACHE
59
60ACPI_STATUS
61AcpiOsCreateCache(char *CacheName, UINT16 ObjectSize, UINT16 MaxDepth,
62 ACPI_CACHE_T **ReturnCache)
63{
64 ACPI_CACHE_T *cache;
65
66 cache = kmalloc(sizeof(*cache), M_TEMP, M_WAITOK);
81a9c16c 67 cache->args.objsize = OBJHEADSIZE + ObjectSize;
e1eeedd0 68 cache->args.mtype = M_CACHE;
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69 cache->cache = objcache_create(CacheName, 0, 0, NULL, NULL,
70 NULL, objcache_malloc_alloc, objcache_malloc_free, &cache->args);
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71 *ReturnCache = cache;
72 return AE_OK;
73}
74
75ACPI_STATUS
76AcpiOsDeleteCache(ACPI_CACHE_T *Cache)
77{
78 objcache_destroy(Cache->cache);
79 kfree(Cache, M_TEMP);
80 return AE_OK;
81}
82
83
84ACPI_STATUS
85AcpiOsPurgeCache(ACPI_CACHE_T *Cache)
86{
87 struct objcache *reclaimlist[] = { Cache->cache };
88
89 objcache_reclaimlist(reclaimlist, 1, M_WAITOK);
90 return AE_OK;
91}
92
93void *
94AcpiOsAcquireObject(ACPI_CACHE_T *Cache)
95{
81a9c16c 96 struct acpiobjhead *head;
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97 void *Object;
98
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99 head = objcache_get(Cache->cache, M_WAITOK);
100 bzero(head, Cache->args.objsize);
101 head->state = TRACK_ALLOCATED;
102 return (head + 1);
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103}
104
105ACPI_STATUS
106AcpiOsReleaseObject(ACPI_CACHE_T *Cache, void *Object)
107{
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108 struct acpiobjhead *head = (void *)((char *)Object - OBJHEADSIZE);
109
110 if (head->state != TRACK_ALLOCATED) {
111 if (head->state == TRACK_FREED)
112 kprintf("AcpiOsReleaseObject: Double Free %p (%08x)\n", Object, head->state);
113 else
114 kprintf("AcpiOsReleaseObject: Bad object %p (%08x)\n", Object, head->state);
115 return AE_OK;
116 }
117 head->state = TRACK_FREED;
118
119 objcache_put(Cache->cache, head);
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120 return AE_OK;
121}
122
123#endif