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 23 /* 24 * memory block 25 */ 26 struct snd_util_memblk { 27 unsigned int size; /* size of this block */ 28 unsigned int offset; /* zero-offset of this block */ 29 struct list_head list; /* link */ 30 }; 31 32 #define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk)) 33 34 /* 35 * memory management information 36 */ 37 struct snd_util_memhdr { 38 unsigned int size; /* size of whole data */ 39 struct list_head block; /* block linked-list header */ 40 int nblocks; /* # of allocated blocks */ 41 unsigned int used; /* used memory size */ 42 int block_extra_size; /* extra data size of chunk */ 43 struct semaphore block_mutex; /* lock */ 44 }; 45 46 /* 47 * prototypes 48 */ 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); 54 55 /* functions without mutex */ 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); 61 62 #endif /* __SOUND_UTIL_MEM_H */ 63