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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __FRAME_H__
  30. #define __FRAME_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <list.h>
  35. #include <synch/spinlock.h>
  36.  
  37. #define FRAME_KA    1   /* skip frames conflicting with user address space */
  38. #define FRAME_PANIC 2   /* panic on failure */
  39.  
  40. struct zone {
  41.     link_t link;        /**< link to previous and next zone */
  42.  
  43.     spinlock_t lock;    /**< this lock protects everything below */
  44.     __address base;     /**< physical address of the first frame in the frames array */
  45.     frame_t *frames;    /**< array of frame_t structures in this zone */
  46.     link_t free_head;   /**< list of free frame_t structures */
  47.     link_t busy_head;   /**< list of busy frame_t structures */
  48.     count_t free_count; /**< number of frame_t structures in free list */
  49.     count_t busy_count; /**< number of frame_t structures in busy list */
  50.     int flags;
  51. };
  52.  
  53. struct frame {
  54.     count_t refcount;   /**< when > 0, the frame is in busy list, otherwise the frame is in free list */
  55.     link_t link;        /**< link either to frame_zone free or busy list */
  56. };
  57.  
  58. extern spinlock_t zone_head_lock;   /**< this lock protects zone_head list */
  59. extern link_t zone_head;        /**< list of all zones in the system */
  60.  
  61. extern void zone_init(void);
  62. extern zone_t *zone_create(__address start, size_t size, int flags);
  63. extern void zone_attach(zone_t *zone);
  64.  
  65. extern void frame_init(void);
  66. extern void frame_initialize(frame_t *frame, zone_t *zone);
  67. __address frame_alloc(int flags);
  68. extern void frame_free(__address addr);
  69. extern void frame_not_free(__address addr);
  70. extern void frame_region_not_free(__address start, __address stop);
  71.  
  72. /*
  73.  * TODO: Implement the following functions.
  74.  */
  75. extern frame_t *frame_reference(frame_t *frame);
  76. extern void frame_release(frame_t *frame);
  77.  
  78. #endif
  79.