Subversion Repositories HelenOS

Rev

Rev 3206 | 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 
} buddy_system_operations_t;
377 jermar 70 
 
2083 decky 71 
typedef struct buddy_system {
2059 jermar 72 
    /** Maximal order of block which can be stored by buddy system. */
73 
    uint8_t max_order;
377 jermar 74 
    link_t *order;
381 jermar 75 
    buddy_system_operations_t *op;
2059 jermar 76 
    /** Pointer to be used by the implementation. */
77 
    void *data;
2083 decky 78 
} buddy_system_t;
377 jermar 79 
 
3206 jermar 80 
extern void buddy_system_create(buddy_system_t *, uint8_t,
81 
    buddy_system_operations_t *, void *);
82 
extern link_t *buddy_system_alloc(buddy_system_t *, uint8_t);
83 
extern bool buddy_system_can_alloc(buddy_system_t *, uint8_t);
84 
extern void buddy_system_free(buddy_system_t *, link_t *);
3972 decky 85 
extern size_t buddy_conf_size(size_t);
3206 jermar 86 
extern link_t *buddy_system_alloc_block(buddy_system_t *, link_t *);
377 jermar 87 
 
88 
#endif
1702 cejka 89 
 
1888 jermar 90 
/** @}
1702 cejka 91 
 */