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  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. /** @addtogroup genericmm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_BUDDY_H_
  36. #define KERN_BUDDY_H_
  37.  
  38. #include <arch/types.h>
  39. #include <adt/list.h>
  40.  
  41. #define BUDDY_SYSTEM_INNER_BLOCK    0xff
  42.  
  43. struct buddy_system;
  44.  
  45. /** Buddy system operations to be implemented by each implementation. */
  46. typedef struct {
  47.     /**
  48.      * Return pointer to left-side or right-side buddy for block passed as
  49.      * argument.
  50.      */
  51.     link_t *(* find_buddy)(struct buddy_system *, link_t *);
  52.     /**
  53.      * Bisect the block passed as argument and return pointer to the new
  54.      * right-side buddy.
  55.      */
  56.     link_t *(* bisect)(struct buddy_system *, link_t *);
  57.     /** Coalesce two buddies into a bigger block. */
  58.     link_t *(* coalesce)(struct buddy_system *, link_t *, link_t *);
  59.     /** Set order of block passed as argument. */
  60.     void (*set_order)(struct buddy_system *, link_t *, uint8_t);
  61.     /** Return order of block passed as argument. */
  62.     uint8_t (*get_order)(struct buddy_system *, link_t *);
  63.     /** Mark block as busy. */
  64.     void (*mark_busy)(struct buddy_system *, link_t *);
  65.     /** Mark block as available. */
  66.     void (*mark_available)(struct buddy_system *, link_t *);
  67.     /** Find parent of block that has given order  */
  68.     link_t *(* find_block)(struct buddy_system *, link_t *, uint8_t);
  69. } buddy_system_operations_t;
  70.  
  71. typedef struct buddy_system {
  72.     /** Maximal order of block which can be stored by buddy system. */
  73.     uint8_t max_order;
  74.     link_t *order;
  75.     buddy_system_operations_t *op;
  76.     /** Pointer to be used by the implementation. */
  77.     void *data;
  78. } buddy_system_t;
  79.  
  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 *);
  85. extern size_t buddy_conf_size(size_t);
  86. extern link_t *buddy_system_alloc_block(buddy_system_t *, link_t *);
  87.  
  88. #endif
  89.  
  90. /** @}
  91.  */
  92.