| Jes Sorensen | f14f75b | 2005-06-21 17:15:02 -0700 | [diff] [blame] | 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 | * |
| Jes Sorensen | f14f75b | 2005-06-21 17:15:02 -0700 | [diff] [blame] | 7 | * This source code is licensed under the GNU General Public License, |
| 8 | * Version 2. See the file COPYING for more details. |
| 9 | */ |
| 10 | |
| Jes Sorensen | f14f75b | 2005-06-21 17:15:02 -0700 | [diff] [blame] | 11 | |
| 12 | /* |
| Dean Nelson | 929f972 | 2006-06-23 02:03:21 -0700 | [diff] [blame] | 13 | * General purpose special memory pool descriptor. |
| Jes Sorensen | f14f75b | 2005-06-21 17:15:02 -0700 | [diff] [blame] | 14 | */ |
| 15 | struct gen_pool { |
| Dean Nelson | 929f972 | 2006-06-23 02:03:21 -0700 | [diff] [blame] | 16 | rwlock_t lock; |
| 17 | struct list_head chunks; /* list of chunks in this pool */ |
| 18 | int min_alloc_order; /* minimum allocation order */ |
| Jes Sorensen | f14f75b | 2005-06-21 17:15:02 -0700 | [diff] [blame] | 19 | }; |
| 20 | |
| Dean Nelson | 929f972 | 2006-06-23 02:03:21 -0700 | [diff] [blame] | 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 unsigned long gen_pool_alloc(struct gen_pool *, size_t); |
| 35 | extern void gen_pool_free(struct gen_pool *, unsigned long, size_t); |