include/linux/genalloc.h

   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);