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/*
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 * Copyright (C) 2005 Jakub Jermar
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 * Copyright (C) 2005 Sergey Bondari
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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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#include <mm/buddy.h>
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#define ONE_FRAME	0
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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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#define FRAME_NON_BLOCKING	4	/* do not panic and do not sleep on failure */
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#define FRAME_OK		0	/* frame_alloc return status */
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#define FRAME_NO_MEMORY		1	/* frame_alloc return status */
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#define FRAME_ERROR		2	/* frame_alloc return status */
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#define FRAME2ADDR(zone, frame)			((zone)->base + ((frame) - (zone)->frames) * FRAME_SIZE)
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#define ADDR2FRAME(zone, addr)			(&((zone)->frames[((addr) - (zone)->base) / FRAME_SIZE]))
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#define FRAME_INDEX(zone, frame)		((index_t)((frame) - (zone)->frames))
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#define FRAME_INDEX_VALID(zone, index)		(((index) >= 0) && ((index) < ((zone)->free_count + (zone)->busy_count)))
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#define IS_BUDDY_ORDER_OK(index, order)		((~(((__native) -1) << (order)) & (index)) == 0)
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#define IS_BUDDY_LEFT_BLOCK(zone, frame)	(((FRAME_INDEX((zone), (frame)) >> (frame)->buddy_order) & 0x1) == 0)
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#define IS_BUDDY_RIGHT_BLOCK(zone, frame)	(((FRAME_INDEX((zone), (frame)) >> (frame)->buddy_order) & 0x1) == 1)
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#define ZONE_BLACKLIST_SIZE	4
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struct zone {
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	link_t link;		/**< link to previous and next zone */
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	SPINLOCK_DECLARE(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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	count_t free_count;	/**< number of free frame_t structures */
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	count_t busy_count;	/**< number of busy frame_t structures */
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	buddy_system_t * buddy_system; /**< buddy system for the zone */
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	int flags;
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};
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struct frame {
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	count_t refcount;	/**< tracking of shared frames  */
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	__u8 buddy_order;	/**< buddy system block order */
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	link_t buddy_link;	/**< link to the next free block inside one order */
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};
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struct region {
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	__address base;
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	size_t size;
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};
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extern region_t zone_blacklist[];
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extern count_t zone_blacklist_count;
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extern void frame_region_not_free(__address base, size_t size);
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extern void zone_create_in_region(__address base, size_t size);
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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 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, __u8 order, int * status);
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extern void frame_free(__address addr);
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zone_t * get_zone_by_frame(frame_t * frame);
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/*
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 * Buddy system operations
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 */
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link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * buddy);
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link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block);
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link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * buddy_l, link_t * buddy_r);
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void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order);
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__u8 zone_buddy_get_order(buddy_system_t *b, link_t * block);
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void zone_buddy_mark_busy(buddy_system_t *b, link_t * block);
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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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/*
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 * Console functions
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 */
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extern void zone_print_list(void);
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extern void zone_print_one(__address base);
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#endif