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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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#ifndef __BUDDY_H__
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#define __BUDDY_H__
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#include <arch/types.h>
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#include <typedefs.h>
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#define BUDDY_SYSTEM_INNER_BLOCK	0xff
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/** Buddy system operations to be implemented by each implementations. */
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struct buddy_system_operations {
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	link_t *(* find_buddy)(buddy_system_t *, link_t *);		/**< Return pointer to left-side or right-side buddy for block passed as argument. */
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	link_t *(* bisect)(buddy_system_t *, link_t *);			/**< Bisect the block passed as argument and return pointer to the new right-side buddy. */
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	link_t *(* coalesce)(buddy_system_t *, link_t *, link_t *);	/**< Coalesce two buddies into a bigger block. */
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	void (*set_order)(buddy_system_t *, link_t *, __u8);		/**< Set order of block passed as argument. */
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	__u8 (*get_order)(buddy_system_t *, link_t *);			/**< Return order of block passed as argument. */
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	void (*mark_busy)(buddy_system_t *, link_t *);			/**< Mark block as busy */
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};
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struct buddy_system {
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	__u8 max_order;
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	link_t *order;
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	buddy_system_operations_t *op;
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	void *data;				/**< Pointer to be used by the implementation. */
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};
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extern buddy_system_t *buddy_system_create(__u8 max_order, buddy_system_operations_t *op, void *data);
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extern link_t *buddy_system_alloc(buddy_system_t *b, __u8 i);
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extern bool buddy_system_can_alloc(buddy_system_t *b, __u8 order);
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extern void buddy_system_free(buddy_system_t *b, link_t *block);
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#endif