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/*

 * Copyright (C) 2005 Jakub Jermar

 * Copyright (C) 2005 Sergey Bondari

 * 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>

#include <mm/buddy.h>

#define ONE_FRAME   0

#define FRAME_KA    1   /* skip frames conflicting with user address space */

#define FRAME_PANIC 2   /* panic on failure */

#define FRAME2ADDR(zone, frame)         ((zone)->base + ((frame) - (zone)->frames) * FRAME_SIZE)

#define ADDR2FRAME(zone, addr)          (&((zone)->frames[((addr) - (zone)->base) / FRAME_SIZE]))

#define FRAME_INDEX(zone, frame)        ((index_t)((frame) - (zone)->frames))

#define FRAME_INDEX_VALID(zone, index)      (((index) >= 0) && ((index) < ((zone)->free_count + (zone)->busy_count)))

#define IS_BUDDY_ORDER_OK(index, order)     ((~(((__native) -1) << (order)) & (index)) == 0)

#define IS_BUDDY_LEFT_BLOCK(zone, frame)    (((FRAME_INDEX((zone), (frame)) >> (frame)->buddy_order) & 0x1) == 0)

#define IS_BUDDY_RIGHT_BLOCK(zone, frame)   (((FRAME_INDEX((zone), (frame)) >> (frame)->buddy_order) & 0x1) == 1)

#define ZONE_BLACKLIST_SIZE 3

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 */

    count_t free_count; /**< number of free frame_t structures */

    count_t busy_count; /**< number of busy frame_t structures */

    buddy_system_t * buddy_system; /**< buddy system for the zone */

    int flags;

};

struct frame {

    count_t refcount;   /**< tracking of shared frames  */

    __u8 buddy_order;   /**< buddy system block order */

    link_t buddy_link;  /**< link to the next free block inside one order */

};

struct region {

    __address base;

    size_t size;

};

extern region_t zone_blacklist[];

extern count_t zone_blacklist_count;

extern void frame_region_not_free(__address base, size_t size);

extern void zone_create_in_region(__address base, size_t size);

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, __u8 order);

extern void frame_free(__address addr);

zone_t * get_zone_by_frame(frame_t * frame);

/*

 * Buddy system operations

 */

link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * buddy);

link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block);

link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * buddy_l, link_t * buddy_r);

void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order);

__u8 zone_buddy_get_order(buddy_system_t *b, link_t * block);

void zone_buddy_mark_busy(buddy_system_t *b, link_t * block);

/*

 * TODO: Implement the following functions.

 */

extern frame_t *frame_reference(frame_t *frame);

extern void frame_release(frame_t *frame);

#endif