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377 jermar 1 
/*
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 * Copyright (c) 2005 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genericmm
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_BUDDY_H_
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#define KERN_BUDDY_H_
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#include <arch/types.h>
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#include <adt/list.h>
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#define BUDDY_SYSTEM_INNER_BLOCK    0xff
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struct buddy_system;
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/** Buddy system operations to be implemented by each implementation. */
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typedef struct {
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    /**
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     * Return pointer to left-side or right-side buddy for block passed as
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     * argument.
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     */
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    link_t *(* find_buddy)(struct buddy_system *, link_t *);
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    /**
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     * Bisect the block passed as argument and return pointer to the new
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     * right-side buddy.
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     */
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    link_t *(* bisect)(struct buddy_system *, link_t *);
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    /** Coalesce two buddies into a bigger block. */
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    link_t *(* coalesce)(struct buddy_system *, link_t *, link_t *);
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    /** Set order of block passed as argument. */
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    void (*set_order)(struct buddy_system *, link_t *, uint8_t);
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    /** Return order of block passed as argument. */
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    uint8_t (*get_order)(struct buddy_system *, link_t *);
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    /** Mark block as busy. */
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    void (*mark_busy)(struct buddy_system *, link_t *);
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    /** Mark block as available. */
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    void (*mark_available)(struct buddy_system *, link_t *);
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    /** Find parent of block that has given order  */
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    link_t *(* find_block)(struct buddy_system *, link_t *, uint8_t);
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    void (* print_id)(struct buddy_system *, link_t *);
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} buddy_system_operations_t;
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typedef struct buddy_system {
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    /** Maximal order of block which can be stored by buddy system. */
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    uint8_t max_order;
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    link_t *order;
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    buddy_system_operations_t *op;
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    /** Pointer to be used by the implementation. */
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    void *data;
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} buddy_system_t;
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extern void buddy_system_create(buddy_system_t *b, uint8_t max_order,
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    buddy_system_operations_t *op, void *data);
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extern link_t *buddy_system_alloc(buddy_system_t *b, uint8_t i);
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extern bool buddy_system_can_alloc(buddy_system_t *b, uint8_t order);
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extern void buddy_system_free(buddy_system_t *b, link_t *block);
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extern void buddy_system_structure_print(buddy_system_t *b, size_t elem_size);
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extern size_t buddy_conf_size(int max_order);
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extern link_t *buddy_system_alloc_block(buddy_system_t *b, link_t *block);
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#endif
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/** @}
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 */