1 /* 2 * Basic general purpose allocator for managing special purpose memory 3 * not managed by the regular kmalloc/kfree interface. 4 * Uses for this includes on-device special memory, uncached memory 5 * etc. 6 * 7 * This source code is licensed under the GNU General Public License, 8 * Version 2. See the file COPYING for more details. 9 */ 10 11 12 /* 13 * General purpose special memory pool descriptor. 14 */ 15 struct gen_pool { 16 rwlock_t lock; 17 struct list_head chunks; /* list of chunks in this pool */ 18 int min_alloc_order; /* minimum allocation order */ 19 }; 20 21 /* 22 * General purpose special memory pool chunk descriptor. 23 */ 24 struct gen_pool_chunk { 25 spinlock_t lock; 26 struct list_head next_chunk; /* next chunk in pool */ 27 unsigned long start_addr; /* starting address of memory chunk */ 28 unsigned long end_addr; /* ending address of memory chunk */ 29 unsigned long bits[0]; /* bitmap for allocating memory chunk */ 30 }; 31 32 extern struct gen_pool *gen_pool_create(int, int); 33 extern int gen_pool_add(struct gen_pool *, unsigned long, size_t, int); 34 extern void gen_pool_destroy(struct gen_pool *); 35 extern unsigned long gen_pool_alloc(struct gen_pool *, size_t); 36 extern void gen_pool_free(struct gen_pool *, unsigned long, size_t); 37