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/*
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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 __FRAME_H__
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#define __FRAME_H__
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#include <arch/types.h>
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#include <typedefs.h>
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#include <list.h>
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#include <synch/spinlock.h>
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#define FRAME_KA    1   /* skip frames conflicting with user address space */
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#define FRAME_PANIC 2   /* panic on failure */
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struct zone {
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    link_t link;        /**< link to previous and next zone */
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    spinlock_t lock;    /**< this lock protects everything below */
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    __address base;     /**< physical address of the first frame in the frames array */
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    frame_t *frames;    /**< array of frame_t structures in this zone */
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    link_t free_head;   /**< list of free frame_t structures */
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    link_t busy_head;   /**< list of busy frame_t structures */
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    count_t free_count; /**< number of frame_t structures in free list */
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    count_t busy_count; /**< number of frame_t structures in busy list */
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    int flags;
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};
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struct frame {
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    count_t refcount;   /**< when > 0, the frame is in busy list, otherwise the frame is in free list */
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    link_t link;        /**< link either to frame_zone free or busy list */
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};
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extern spinlock_t zone_head_lock;   /**< this lock protects zone_head list */
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extern link_t zone_head;        /**< list of all zones in the system */
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extern void zone_init(void);
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extern zone_t *zone_create(__address start, size_t size, int flags);
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extern void zone_attach(zone_t *zone);
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extern void frame_init(void);
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extern void frame_initialize(frame_t *frame, zone_t *zone);
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__address frame_alloc(int flags);
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extern void frame_free(__address addr);
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extern void frame_not_free(__address addr);
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extern void frame_region_not_free(__address start, __address stop);
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/*
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 * TODO: Implement the following functions.
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 */
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extern frame_t *frame_reference(frame_t *frame);
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extern void frame_release(frame_t *frame);
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#endif