Subversion Repositories HelenOS

Rev

Rev 2106 | Rev 3425 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
377 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2005 Jakub Jermar
377 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
 
1888 jermar 29
/** @addtogroup genericmm
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1888 jermar 35
#ifndef KERN_BUDDY_H_
36
#define KERN_BUDDY_H_
377 jermar 37
 
38
#include <arch/types.h>
2089 decky 39
#include <adt/list.h>
377 jermar 40
 
378 jermar 41
#define BUDDY_SYSTEM_INNER_BLOCK    0xff
42
 
2083 decky 43
struct buddy_system;
44
 
1139 jermar 45
/** Buddy system operations to be implemented by each implementation. */
2083 decky 46
typedef struct {
2106 jermar 47
    /**
48
     * Return pointer to left-side or right-side buddy for block passed as
49
     * argument.
50
     */
2083 decky 51
    link_t *(* find_buddy)(struct buddy_system *, link_t *);
2106 jermar 52
    /**
53
     * Bisect the block passed as argument and return pointer to the new
54
     * right-side buddy.
55
     */
2083 decky 56
    link_t *(* bisect)(struct buddy_system *, link_t *);
2059 jermar 57
    /** Coalesce two buddies into a bigger block. */
2083 decky 58
    link_t *(* coalesce)(struct buddy_system *, link_t *, link_t *);
2059 jermar 59
    /** Set order of block passed as argument. */
2083 decky 60
    void (*set_order)(struct buddy_system *, link_t *, uint8_t);
2059 jermar 61
    /** Return order of block passed as argument. */
2083 decky 62
    uint8_t (*get_order)(struct buddy_system *, link_t *);
2059 jermar 63
    /** Mark block as busy. */
2083 decky 64
    void (*mark_busy)(struct buddy_system *, link_t *);
2059 jermar 65
    /** Mark block as available. */
2083 decky 66
    void (*mark_available)(struct buddy_system *, link_t *);
814 palkovsky 67
    /** Find parent of block that has given order  */
2083 decky 68
    link_t *(* find_block)(struct buddy_system *, link_t *, uint8_t);
69
    void (* print_id)(struct buddy_system *, link_t *);
70
} buddy_system_operations_t;
377 jermar 71
 
2083 decky 72
typedef struct buddy_system {
2059 jermar 73
    /** Maximal order of block which can be stored by buddy system. */
74
    uint8_t max_order;
377 jermar 75
    link_t *order;
381 jermar 76
    buddy_system_operations_t *op;
2059 jermar 77
    /** Pointer to be used by the implementation. */
78
    void *data;
2083 decky 79
} buddy_system_t;
377 jermar 80
 
2059 jermar 81
extern void buddy_system_create(buddy_system_t *b, uint8_t max_order,
2106 jermar 82
    buddy_system_operations_t *op, void *data);
1780 jermar 83
extern link_t *buddy_system_alloc(buddy_system_t *b, uint8_t i);
84
extern bool buddy_system_can_alloc(buddy_system_t *b, uint8_t order);
377 jermar 85
extern void buddy_system_free(buddy_system_t *b, link_t *block);
686 bondari 86
extern void buddy_system_structure_print(buddy_system_t *b, size_t elem_size);
814 palkovsky 87
extern size_t buddy_conf_size(int max_order);
88
extern link_t *buddy_system_alloc_block(buddy_system_t *b, link_t *block);
377 jermar 89
 
90
#endif
1702 cejka 91
 
1888 jermar 92
/** @}
1702 cejka 93
 */