| 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 | /** @addtogroup genericmm
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_BUDDY_H_
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| 36 | #define KERN_BUDDY_H_
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| 37 |
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| 38 | #include <typedefs.h>
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| 39 | #include <adt/list.h>
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| 40 |
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| 41 | #define BUDDY_SYSTEM_INNER_BLOCK 0xff
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| 42 |
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| 43 | struct buddy_system;
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| 44 |
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| 45 | /** Buddy system operations to be implemented by each implementation. */
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| 46 | typedef struct {
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| 47 | /**
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| 48 | * Return pointer to left-side or right-side buddy for block passed as
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| 49 | * argument.
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| 50 | */
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| 51 | link_t *(* find_buddy)(struct buddy_system *, link_t *);
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| 52 | /**
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| 53 | * Bisect the block passed as argument and return pointer to the new
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| 54 | * right-side buddy.
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| 55 | */
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| 56 | link_t *(* bisect)(struct buddy_system *, link_t *);
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| 57 | /** Coalesce two buddies into a bigger block. */
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| 58 | link_t *(* coalesce)(struct buddy_system *, link_t *, link_t *);
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| 59 | /** Set order of block passed as argument. */
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| 60 | void (*set_order)(struct buddy_system *, link_t *, uint8_t);
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| 61 | /** Return order of block passed as argument. */
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| 62 | uint8_t (*get_order)(struct buddy_system *, link_t *);
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| 63 | /** Mark block as busy. */
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| 64 | void (*mark_busy)(struct buddy_system *, link_t *);
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| 65 | /** Mark block as available. */
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| 66 | void (*mark_available)(struct buddy_system *, link_t *);
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| 67 | /** Find parent of block that has given order */
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| 68 | link_t *(* find_block)(struct buddy_system *, link_t *, uint8_t);
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| 69 | } buddy_system_operations_t;
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| 70 |
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| 71 | typedef struct buddy_system {
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| 72 | /** Maximal order of block which can be stored by buddy system. */
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| 73 | uint8_t max_order;
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| 74 | list_t *order;
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| 75 | buddy_system_operations_t *op;
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| 76 | /** Pointer to be used by the implementation. */
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| 77 | void *data;
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| 78 | } buddy_system_t;
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| 79 |
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| 80 | extern void buddy_system_create(buddy_system_t *, uint8_t,
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| 81 | buddy_system_operations_t *, void *);
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| 82 | extern link_t *buddy_system_alloc(buddy_system_t *, uint8_t);
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| 83 | extern bool buddy_system_can_alloc(buddy_system_t *, uint8_t);
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| 84 | extern void buddy_system_free(buddy_system_t *, link_t *);
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| 85 | extern size_t buddy_conf_size(size_t);
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| 86 | extern link_t *buddy_system_alloc_block(buddy_system_t *, link_t *);
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| 87 |
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| 88 | #endif
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| 89 |
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| 90 | /** @}
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| 91 | */
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