aboutsummaryrefslogblamecommitdiffstats
path: root/include/linux/genalloc.h
blob: 690c42803d2e7d310e7bd59cbac2abebaa263098 (plain) (tree)
1
2
3
4
5
6
7
8
9
10





                                                                      



                                                                     
 
  
                                                   
   



                                                                         


  
                                                         
   
                       
                        



                                                                                

  



                                                                       
/*
 * 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 unsigned long gen_pool_alloc(struct gen_pool *, size_t);
extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);