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#ifndef __FRAME_H__
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#ifndef __FRAME_H__
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#define __FRAME_H__
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#define __FRAME_H__
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#include <arch/types.h>
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#include <arch/types.h>
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#include <typedefs.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_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_PANIC 2   /* panic on failure */
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struct frame_zone {
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    link_t fz_link;     /**< link to previous and next frame_zone */
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    spinlock_t lock;    /**< this lock protexts everything below */
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    link_t free_head;   /**< list of free frames */
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    link_t busy_head;   /**< list of busy frames */
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    count_t free_count; /**< frames in free list */
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    count_t busy_count; /**< frames in busy list */
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    frame_t *frames;    /**< array of frames in this zone */
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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 frame_zone_head_lock;     /**< this lock protects frame_zone_head list */
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extern link_t frame_zone_head;          /**< list of all frame_zone's in the system */
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extern count_t frames;
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extern count_t frames;
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extern count_t frames_free;
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extern count_t frames_free;
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extern count_t kernel_frames;
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extern count_t kernel_frames;
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extern count_t kernel_frames_free;
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extern count_t kernel_frames_free;