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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 code is based on the buddy allocator found in the sym53c8xx_2
8 * driver, adapted for general purpose use.
9 *
10 * This source code is licensed under the GNU General Public License,
11 * Version 2. See the file COPYING for more details.
12 */
13
14#include <linux/spinlock.h>
15
16#define ALLOC_MIN_SHIFT 5 /* 32 bytes minimum */
17/*
18 * Link between free memory chunks of a given size.
19 */
20struct gen_pool_link {
21 struct gen_pool_link *next;
22};
23
24/*
25 * Memory pool descriptor.
26 */
27struct gen_pool {
28 spinlock_t lock;
29 unsigned long (*get_new_chunk)(struct gen_pool *);
30 struct gen_pool *next;
31 struct gen_pool_link *h;
32 unsigned long private;
33 int max_chunk_shift;
34};
35
36unsigned long gen_pool_alloc(struct gen_pool *poolp, int size);
37void gen_pool_free(struct gen_pool *mp, unsigned long ptr, int size);
38struct gen_pool *gen_pool_create(int nr_chunks, int max_chunk_shift,
39 unsigned long (*fp)(struct gen_pool *),
40 unsigned long data);