Subversion Repositories HelenOS-historic

Rev

Rev 683 | Rev 756 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
377 jermar 1
/*
2
 * Copyright (C) 2005 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
#ifndef __BUDDY_H__
30
#define __BUDDY_H__
31
 
32
#include <arch/types.h>
33
#include <typedefs.h>
34
 
378 jermar 35
#define BUDDY_SYSTEM_INNER_BLOCK    0xff
36
 
489 jermar 37
/** Buddy system operations to be implemented by each implementations. */
381 jermar 38
struct buddy_system_operations {
489 jermar 39
    link_t *(* find_buddy)(buddy_system_t *, link_t *);     /**< Return pointer to left-side or right-side buddy for block passed as argument. */
40
    link_t *(* bisect)(buddy_system_t *, link_t *);         /**< Bisect the block passed as argument and return pointer to the new right-side buddy. */
41
    link_t *(* coalesce)(buddy_system_t *, link_t *, link_t *); /**< Coalesce two buddies into a bigger block. */
42
    void (*set_order)(buddy_system_t *, link_t *, __u8);        /**< Set order of block passed as argument. */
43
    __u8 (*get_order)(buddy_system_t *, link_t *);          /**< Return order of block passed as argument. */
533 bondari 44
    void (*mark_busy)(buddy_system_t *, link_t *);          /**< Mark block as busy */
377 jermar 45
};
46
 
47
struct buddy_system {
48
    __u8 max_order;
49
    link_t *order;
381 jermar 50
    buddy_system_operations_t *op;
489 jermar 51
    void *data;             /**< Pointer to be used by the implementation. */
377 jermar 52
};
53
 
489 jermar 54
extern buddy_system_t *buddy_system_create(__u8 max_order, buddy_system_operations_t *op, void *data);
377 jermar 55
extern link_t *buddy_system_alloc(buddy_system_t *b, __u8 i);
533 bondari 56
extern bool buddy_system_can_alloc(buddy_system_t *b, __u8 order);
377 jermar 57
extern void buddy_system_free(buddy_system_t *b, link_t *block);
686 bondari 58
extern void buddy_system_structure_print(buddy_system_t *b, size_t elem_size);
377 jermar 59
 
683 bondari 60
 
377 jermar 61
#endif