| 0,0 → 1,78 |
|---|
| /* |
| * Copyright (C) 2005 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup genericmm |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #ifndef __BUDDY_H__ |
| #define __BUDDY_H__ |
| |
| #include <arch/types.h> |
| #include <typedefs.h> |
| |
| #define BUDDY_SYSTEM_INNER_BLOCK 0xff |
| |
| /** Buddy system operations to be implemented by each implementation. */ |
| struct buddy_system_operations { |
| link_t *(* find_buddy)(buddy_system_t *, link_t *); /**< Return pointer to left-side or right-side buddy for block passed as argument. */ |
| link_t *(* bisect)(buddy_system_t *, link_t *); /**< Bisect the block passed as argument and return pointer to the new right-side buddy. */ |
| link_t *(* coalesce)(buddy_system_t *, link_t *, link_t *); /**< Coalesce two buddies into a bigger block. */ |
| void (*set_order)(buddy_system_t *, link_t *, uint8_t); /**< Set order of block passed as argument. */ |
| uint8_t (*get_order)(buddy_system_t *, link_t *); /**< Return order of block passed as argument. */ |
| void (*mark_busy)(buddy_system_t *, link_t *); /**< Mark block as busy. */ |
| void (*mark_available)(buddy_system_t *, link_t *); /**< Mark block as available. */ |
| /** Find parent of block that has given order */ |
| link_t *(* find_block)(buddy_system_t *, link_t *, uint8_t); |
| void (* print_id)(buddy_system_t *, link_t *); |
| }; |
| |
| struct buddy_system { |
| uint8_t max_order; /**< Maximal order of block which can be stored by buddy system. */ |
| link_t *order; |
| buddy_system_operations_t *op; |
| void *data; /**< Pointer to be used by the implementation. */ |
| }; |
| |
| extern void buddy_system_create(buddy_system_t *b, |
| uint8_t max_order, |
| buddy_system_operations_t *op, void *data); |
| extern link_t *buddy_system_alloc(buddy_system_t *b, uint8_t i); |
| extern bool buddy_system_can_alloc(buddy_system_t *b, uint8_t order); |
| extern void buddy_system_free(buddy_system_t *b, link_t *block); |
| extern void buddy_system_structure_print(buddy_system_t *b, size_t elem_size); |
| extern size_t buddy_conf_size(int max_order); |
| extern link_t *buddy_system_alloc_block(buddy_system_t *b, link_t *block); |
| |
| #endif |
| |
| /** @} |
| */ |
| |