1 #ifndef __SOUND_UTIL_MEM_H 2 #define __SOUND_UTIL_MEM_H 3 4 #include <linux/mutex.h> 5 /* 6 * Copyright (C) 2000 Takashi Iwai <tiwai (at) suse.de> 7 * 8 * Generic memory management routines for soundcard memory allocation 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 */ 24 25 /* 26 * memory block 27 */ 28 struct snd_util_memblk { 29 unsigned int size; /* size of this block */ 30 unsigned int offset; /* zero-offset of this block */ 31 struct list_head list; /* link */ 32 }; 33 34 #define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk)) 35 36 /* 37 * memory management information 38 */ 39 struct snd_util_memhdr { 40 unsigned int size; /* size of whole data */ 41 struct list_head block; /* block linked-list header */ 42 int nblocks; /* # of allocated blocks */ 43 unsigned int used; /* used memory size */ 44 int block_extra_size; /* extra data size of chunk */ 45 struct mutex block_mutex; /* lock */ 46 }; 47 48 /* 49 * prototypes 50 */ 51 struct snd_util_memhdr *snd_util_memhdr_new(int memsize); 52 void snd_util_memhdr_free(struct snd_util_memhdr *hdr); 53 struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 54 int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 55 int snd_util_mem_avail(struct snd_util_memhdr *hdr); 56 57 /* functions without mutex */ 58 struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); 59 void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); 60 struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr, 61 unsigned int units, 62 struct list_head *prev); 63 64 #endif /* __SOUND_UTIL_MEM_H */ 65
