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/*

 * 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);