genalloc.h 1.2 KB

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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 source code is licensed under the GNU General Public License,
  8. * Version 2. See the file COPYING for more details.
  9. */
  10. /*
  11. * General purpose special memory pool descriptor.
  12. */
  13. struct gen_pool {
  14. rwlock_t lock;
  15. struct list_head chunks; /* list of chunks in this pool */
  16. int min_alloc_order; /* minimum allocation order */
  17. };
  18. /*
  19. * General purpose special memory pool chunk descriptor.
  20. */
  21. struct gen_pool_chunk {
  22. spinlock_t lock;
  23. struct list_head next_chunk; /* next chunk in pool */
  24. unsigned long start_addr; /* starting address of memory chunk */
  25. unsigned long end_addr; /* ending address of memory chunk */
  26. unsigned long bits[0]; /* bitmap for allocating memory chunk */
  27. };
  28. extern struct gen_pool *gen_pool_create(int, int);
  29. extern int gen_pool_add(struct gen_pool *, unsigned long, size_t, int);
  30. extern void gen_pool_destroy(struct gen_pool *);
  31. extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
  32. extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);