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| Rev | Author | Line No. | Line |
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| 377 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Jakub Jermar |
| 377 | jermar | 3 | * All rights reserved. |
| 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 | |||
| 1888 | jermar | 29 | /** @addtogroup genericmm |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1888 | jermar | 35 | #ifndef KERN_BUDDY_H_ |
| 36 | #define KERN_BUDDY_H_ |
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| 377 | jermar | 37 | |
| 38 | #include <arch/types.h> |
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| 39 | #include <typedefs.h> |
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| 40 | |||
| 378 | jermar | 41 | #define BUDDY_SYSTEM_INNER_BLOCK 0xff |
| 42 | |||
| 1139 | jermar | 43 | /** Buddy system operations to be implemented by each implementation. */ |
| 381 | jermar | 44 | struct buddy_system_operations { |
| 2059 | jermar | 45 | /** Return pointer to left-side or right-side buddy for block passed as |
| 46 | * argument. */ |
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| 47 | link_t *(* find_buddy)(buddy_system_t *, link_t *); |
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| 48 | /** Bisect the block passed as argument and return pointer to the new |
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| 49 | * right-side buddy. */ |
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| 50 | link_t *(* bisect)(buddy_system_t *, link_t *); |
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| 51 | /** Coalesce two buddies into a bigger block. */ |
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| 52 | link_t *(* coalesce)(buddy_system_t *, link_t *, link_t *); |
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| 53 | /** Set order of block passed as argument. */ |
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| 54 | void (*set_order)(buddy_system_t *, link_t *, uint8_t); |
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| 55 | /** Return order of block passed as argument. */ |
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| 56 | uint8_t (*get_order)(buddy_system_t *, link_t *); |
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| 57 | /** Mark block as busy. */ |
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| 58 | void (*mark_busy)(buddy_system_t *, link_t *); |
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| 59 | /** Mark block as available. */ |
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| 60 | void (*mark_available)(buddy_system_t *, link_t *); |
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| 814 | palkovsky | 61 | /** Find parent of block that has given order */ |
| 1780 | jermar | 62 | link_t *(* find_block)(buddy_system_t *, link_t *, uint8_t); |
| 822 | palkovsky | 63 | void (* print_id)(buddy_system_t *, link_t *); |
| 377 | jermar | 64 | }; |
| 65 | |||
| 66 | struct buddy_system { |
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| 2059 | jermar | 67 | /** Maximal order of block which can be stored by buddy system. */ |
| 68 | uint8_t max_order; |
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| 377 | jermar | 69 | link_t *order; |
| 381 | jermar | 70 | buddy_system_operations_t *op; |
| 2059 | jermar | 71 | /** Pointer to be used by the implementation. */ |
| 72 | void *data; |
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| 377 | jermar | 73 | }; |
| 74 | |||
| 2059 | jermar | 75 | extern void buddy_system_create(buddy_system_t *b, uint8_t max_order, |
| 76 | buddy_system_operations_t *op, void *data); |
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| 1780 | jermar | 77 | extern link_t *buddy_system_alloc(buddy_system_t *b, uint8_t i); |
| 78 | extern bool buddy_system_can_alloc(buddy_system_t *b, uint8_t order); |
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| 377 | jermar | 79 | extern void buddy_system_free(buddy_system_t *b, link_t *block); |
| 686 | bondari | 80 | extern void buddy_system_structure_print(buddy_system_t *b, size_t elem_size); |
| 814 | palkovsky | 81 | extern size_t buddy_conf_size(int max_order); |
| 82 | extern link_t *buddy_system_alloc_block(buddy_system_t *b, link_t *block); |
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| 377 | jermar | 83 | |
| 84 | #endif |
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| 1702 | cejka | 85 | |
| 1888 | jermar | 86 | /** @} |
| 1702 | cejka | 87 | */ |