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/*
 * Copyright (C) 2005 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.
 */

#ifndef __FRAME_H__
#define __FRAME_H__

#include <arch/types.h>
#include <typedefs.h>
#include <list.h>
#include <synch/spinlock.h>

#define FRAME_KA    1   /* skip frames conflicting with user address space */
#define FRAME_PANIC 2   /* panic on failure */

struct zone {
    link_t link;        /**< link to previous and next zone */

    spinlock_t lock;    /**< this lock protects everything below */
    __address base;     /**< physical address of the first frame in the frames array */
    frame_t *frames;    /**< array of frame_t structures in this zone */
    link_t free_head;   /**< list of free frame_t structures */
    count_t free_count; /**< number of frame_t structures in free list */
    count_t busy_count; /**< number of frame_t structures not in free list */
    int flags;
};

struct frame {
    count_t refcount;   /**< when == 0, the frame is in free list */
    link_t link;        /**< link to zone free list when refcount == 0 */
};

extern spinlock_t zone_head_lock;   /**< this lock protects zone_head list */
extern link_t zone_head;        /**< list of all zones in the system */

extern void zone_init(void);
extern zone_t *zone_create(__address start, size_t size, int flags);
extern void zone_attach(zone_t *zone);

extern void frame_init(void);
extern void frame_initialize(frame_t *frame, zone_t *zone);
__address frame_alloc(int flags);
extern void frame_free(__address addr);
extern void frame_not_free(__address addr);
extern void frame_region_not_free(__address start, __address stop);

/*
 * TODO: Implement the following functions.
 */
extern frame_t *frame_reference(frame_t *frame);
extern void frame_release(frame_t *frame);

#endif