Subversion Repositories HelenOS

Rev

Rev 2071 | Rev 2089 | 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>
39 
#include <typedefs.h>
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 {
2059 jermar 47 
    /** Return pointer to left-side or right-side buddy for block passed as
48 
      * argument. */
2083 decky 49 
    link_t *(* find_buddy)(struct buddy_system *, link_t *);
2059 jermar 50 
    /** Bisect the block passed as argument and return pointer to the new
51 
      * right-side buddy. */
2083 decky 52 
    link_t *(* bisect)(struct buddy_system *, link_t *);
2059 jermar 53 
    /** Coalesce two buddies into a bigger block. */
2083 decky 54 
    link_t *(* coalesce)(struct buddy_system *, link_t *, link_t *);
2059 jermar 55 
    /** Set order of block passed as argument. */
2083 decky 56 
    void (*set_order)(struct buddy_system *, link_t *, uint8_t);
2059 jermar 57 
    /** Return order of block passed as argument. */
2083 decky 58 
    uint8_t (*get_order)(struct buddy_system *, link_t *);
2059 jermar 59 
    /** Mark block as busy. */
2083 decky 60 
    void (*mark_busy)(struct buddy_system *, link_t *);
2059 jermar 61 
    /** Mark block as available. */
2083 decky 62 
    void (*mark_available)(struct buddy_system *, link_t *);
814 palkovsky 63 
    /** Find parent of block that has given order  */
2083 decky 64 
    link_t *(* find_block)(struct buddy_system *, link_t *, uint8_t);
65 
    void (* print_id)(struct buddy_system *, link_t *);
66 
} buddy_system_operations_t;
377 jermar 67 
 
2083 decky 68 
typedef struct buddy_system {
2059 jermar 69 
    /** Maximal order of block which can be stored by buddy system. */
70 
    uint8_t max_order;
377 jermar 71 
    link_t *order;
381 jermar 72 
    buddy_system_operations_t *op;
2059 jermar 73 
    /** Pointer to be used by the implementation. */
74 
    void *data;
2083 decky 75 
} buddy_system_t;
377 jermar 76 
 
2059 jermar 77 
extern void buddy_system_create(buddy_system_t *b, uint8_t max_order,
78 
    buddy_system_operations_t *op, void *data);
1780 jermar 79 
extern link_t *buddy_system_alloc(buddy_system_t *b, uint8_t i);
80 
extern bool buddy_system_can_alloc(buddy_system_t *b, uint8_t order);
377 jermar 81 
extern void buddy_system_free(buddy_system_t *b, link_t *block);
686 bondari 82 
extern void buddy_system_structure_print(buddy_system_t *b, size_t elem_size);
814 palkovsky 83 
extern size_t buddy_conf_size(int max_order);
84 
extern link_t *buddy_system_alloc_block(buddy_system_t *b, link_t *block);
377 jermar 85 
 
86 
#endif
1702 cejka 87 
 
1888 jermar 88 
/** @}
1702 cejka 89 
 */