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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  3.  * Copyright (C) 2005 Sergey Bondari
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. #ifndef __FRAME_H__
  31. #define __FRAME_H__
  32.  
  33. #include <arch/types.h>
  34. #include <typedefs.h>
  35. #include <list.h>
  36. #include <synch/spinlock.h>
  37. #include <mm/buddy.h>
  38.  
  39. #define FRAME_KA    1   /* skip frames conflicting with user address space */
  40. #define FRAME_PANIC 2   /* panic on failure */
  41.  
  42. #define FRAME2ADDR(zone, frame)         ((zone)->base + ((frame) - (zone)->frames) * FRAME_SIZE)
  43. #define ADDR2FRAME(zone, addr)          (&((zone)->frames[((addr) - (zone)->base) / FRAME_SIZE]))
  44. #define FRAME_INDEX(zone, frame)        ((count_t)((frame) - (zone)->frames))
  45. #define IS_BUDDY_LEFT_BLOCK(zone, frame)    ((FRAME_INDEX((zone), (frame)) % (1 >> ((frame)->buddy_order + 1))) == 0)
  46. #define IS_BUDDY_RIGHT_BLOCK(zone, frame)   ((FRAME_INDEX((zone), (frame)) % (1 >> ((frame)->buddy_order + 1))) == (1 >> (frame)->buddy_order))
  47.  
  48.  
  49.  
  50. struct zone {
  51.     link_t link;        /**< link to previous and next zone */
  52.  
  53.     spinlock_t lock;    /**< this lock protects everything below */
  54.     __address base;     /**< physical address of the first frame in the frames array */
  55.     frame_t *frames;    /**< array of frame_t structures in this zone */
  56.     link_t free_head;   /**< list of free frame_t structures */
  57.     count_t free_count; /**< number of frame_t structures in free list */
  58.     count_t busy_count; /**< number of frame_t structures not in free list */
  59.    
  60.     buddy_system_t * buddy_system; /**< buddy system for the zone */
  61.     int flags;
  62. };
  63.  
  64. struct frame {
  65.     count_t refcount;   /**< when == 0, the frame is in free list */
  66.     link_t link;        /**< link to zone free list when refcount == 0 */
  67.     __u8 buddy_order;   /**< buddy system block order */
  68.     link_t buddy_link;  /**< link to the next free block inside one order*/
  69. };
  70.  
  71. extern spinlock_t zone_head_lock;   /**< this lock protects zone_head list */
  72. extern link_t zone_head;        /**< list of all zones in the system */
  73.  
  74. extern void zone_init(void);
  75. extern zone_t *zone_create(__address start, size_t size, int flags);
  76. extern void zone_attach(zone_t *zone);
  77.  
  78. extern void frame_init(void);
  79. extern void frame_initialize(frame_t *frame, zone_t *zone);
  80. __address frame_alloc(int flags);
  81. extern void frame_free(__address addr);
  82. extern void frame_not_free(__address addr);
  83. extern void frame_region_not_free(__address start, __address stop);
  84. zone_t * get_zone_by_frame(frame_t * frame);
  85.  
  86. /*
  87.  * Buddy system operations
  88.  */
  89. link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * buddy);
  90. link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block);
  91. link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * buddy_l, link_t * buddy_r);
  92. void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order);
  93. __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block);
  94.  
  95. __address zone_buddy_frame_alloc(int flags, __u8 order);
  96. void zone_buddy_frame_free(__address addr);
  97.  
  98. /*
  99.  * TODO: Implement the following functions.
  100.  */
  101. extern frame_t *frame_reference(frame_t *frame);
  102. extern void frame_release(frame_t *frame);
  103.  
  104. #endif
  105.