root/include/linux/genalloc.h

INCLUDED FROM

/*
 * Basic general purpose allocator for managing special purpose memory
 * not managed by the regular kmalloc/kfree interface.
 * Uses for this includes on-device special memory, uncached memory
 * etc.
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */


/*
 *  General purpose special memory pool descriptor.
 */
struct gen_pool {
        rwlock_t lock;
        struct list_head chunks;        /* list of chunks in this pool */
        int min_alloc_order;            /* minimum allocation order */
};

/*
 *  General purpose special memory pool chunk descriptor.
 */
struct gen_pool_chunk {
        spinlock_t lock;
        struct list_head next_chunk;    /* next chunk in pool */
        unsigned long start_addr;       /* starting address of memory chunk */
        unsigned long end_addr;         /* ending address of memory chunk */
        unsigned long bits[0];          /* bitmap for allocating memory chunk */
};

extern struct gen_pool *gen_pool_create(int, int);
extern int gen_pool_add(struct gen_pool *, unsigned long, size_t, int);
extern void gen_pool_destroy(struct gen_pool *);
extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);