* Uses for this includes on-device special memory, uncached memory
* etc.
*
+ * This code is based on the buddy allocator found in the sym53c8xx_2
+ * driver, adapted for general purpose use.
+ *
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
+#include <linux/spinlock.h>
+#define ALLOC_MIN_SHIFT 5 /* 32 bytes minimum */
/*
- * General purpose special memory pool descriptor.
+ * Link between free memory chunks of a given size.
*/
-struct gen_pool {
- rwlock_t lock;
- struct list_head chunks; /* list of chunks in this pool */
- int min_alloc_order; /* minimum allocation order */
+struct gen_pool_link {
+ struct gen_pool_link *next;
};
/*
- * General purpose special memory pool chunk descriptor.
+ * Memory pool descriptor.
*/
-struct gen_pool_chunk {
+struct gen_pool {
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 */
+ unsigned long (*get_new_chunk)(struct gen_pool *);
+ struct gen_pool *next;
+ struct gen_pool_link *h;
+ unsigned long private;
+ int max_chunk_shift;
};
-extern struct gen_pool *gen_pool_create(int, int);
-extern int gen_pool_add(struct gen_pool *, unsigned long, size_t, int);
-extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
-extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
+unsigned long gen_pool_alloc(struct gen_pool *poolp, int size);
+void gen_pool_free(struct gen_pool *mp, unsigned long ptr, int size);
+struct gen_pool *gen_pool_create(int nr_chunks, int max_chunk_shift,
+ unsigned long (*fp)(struct gen_pool *),
+ unsigned long data);