| 1 | /*
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| 2 | * Copyright (C) 2005 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __BUDDY_H__
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| 30 | #define __BUDDY_H__
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| 31 |
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| 32 | #include <arch/types.h>
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| 33 | #include <typedefs.h>
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| 34 |
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| 35 | #define BUDDY_SYSTEM_INNER_BLOCK 0xff
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| 36 |
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| 37 | /** Buddy system operations to be implemented by each implementations. */
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| 38 | struct buddy_system_operations {
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| 39 | link_t *(* find_buddy)(buddy_system_t *, link_t *); /**< Return pointer to left-side or right-side buddy for block passed as argument. */
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| 40 | link_t *(* bisect)(buddy_system_t *, link_t *); /**< Bisect the block passed as argument and return pointer to the new right-side buddy. */
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| 41 | link_t *(* coalesce)(buddy_system_t *, link_t *, link_t *); /**< Coalesce two buddies into a bigger block. */
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| 42 | void (*set_order)(buddy_system_t *, link_t *, __u8); /**< Set order of block passed as argument. */
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| 43 | __u8 (*get_order)(buddy_system_t *, link_t *); /**< Return order of block passed as argument. */
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| 44 | };
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| 45 |
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| 46 | struct buddy_system {
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| 47 | __u8 max_order;
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| 48 | link_t *order;
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| 49 | buddy_system_operations_t *op;
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| 50 | void *data; /**< Pointer to be used by the implementation. */
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| 51 | };
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| 52 |
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| 53 | extern buddy_system_t *buddy_system_create(__u8 max_order, buddy_system_operations_t *op, void *data);
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| 54 | extern link_t *buddy_system_alloc(buddy_system_t *b, __u8 i);
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| 55 | extern void buddy_system_free(buddy_system_t *b, link_t *block);
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| 56 |
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| 57 | #endif
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