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1 | #ifndef __SOUND_UTIL_MEM_H |
2 | #define __SOUND_UTIL_MEM_H | |
3 | /* | |
4 | * Copyright (C) 2000 Takashi Iwai <tiwai@suse.de> | |
5 | * | |
6 | * Generic memory management routines for soundcard memory allocation | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
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23 | /* |
24 | * memory block | |
25 | */ | |
26 | struct snd_util_memblk { | |
03da312a TI |
27 | unsigned int size; /* size of this block */ |
28 | unsigned int offset; /* zero-offset of this block */ | |
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29 | struct list_head list; /* link */ |
30 | }; | |
31 | ||
03da312a | 32 | #define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk)) |
1da177e4 LT |
33 | |
34 | /* | |
35 | * memory management information | |
36 | */ | |
37 | struct snd_util_memhdr { | |
03da312a | 38 | unsigned int size; /* size of whole data */ |
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39 | struct list_head block; /* block linked-list header */ |
40 | int nblocks; /* # of allocated blocks */ | |
03da312a | 41 | unsigned int used; /* used memory size */ |
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42 | int block_extra_size; /* extra data size of chunk */ |
43 | struct semaphore block_mutex; /* lock */ | |
44 | }; | |
45 | ||
46 | /* | |
47 | * prototypes | |
48 | */ | |
03da312a TI |
49 | struct snd_util_memhdr *snd_util_memhdr_new(int memsize); |
50 | void snd_util_memhdr_free(struct snd_util_memhdr *hdr); | |
51 | struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); | |
52 | int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); | |
53 | int snd_util_mem_avail(struct snd_util_memhdr *hdr); | |
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54 | |
55 | /* functions without mutex */ | |
03da312a TI |
56 | struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); |
57 | void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); | |
58 | struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr, | |
59 | unsigned int units, | |
60 | struct list_head *prev); | |
1da177e4 LT |
61 | |
62 | #endif /* __SOUND_UTIL_MEM_H */ |