/*
 * Copyright (c) 2011 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup generic
 * @{
 */
/** @file
 */

#ifndef KERN_RA_H_
#define KERN_RA_H_

#include <typedefs.h>
#include <adt/list.h>
#include <adt/hash_table.h>

typedef struct {
	list_t spans;		/**< List of arena's spans. */
} ra_arena_t;

typedef struct {
	link_t span_link;	/**< Link for the arena's list of spans. */

	list_t segments;	/**< List of span's segments. */

	size_t max_order;	/**< Base 2 logarithm of span's size. */
	list_t *free;		/**< max_order segment free lists. */

	hash_table_t used;
} ra_span_t;

typedef struct {
	link_t segment_link;	/**< Link for the span's list of segments. */
	link_t free_link;	/**< Link for the span's free list. */
	link_t used_link;	/**< Link for the span's used hash table. */

	uintptr_t base;		/**< Segment base. */
	uintptr_t size;		/**< Segment size. */
	
} ra_segment_t;

extern ra_arena_t *ra_arena_create(uintptr_t, size_t);
extern void ra_span_add(ra_arena_t *, uintptr_t, size_t);
extern uintptr_t ra_alloc(ra_arena_t *, size_t, size_t);
extern void ra_free(ra_arena_t *, uintptr_t, size_t);

#endif

/** @}
 */