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  1. /*
  2.  * Copyright (c) 2006 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. /** @addtogroup genericadt
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_BITMAP_H_
  36. #define KERN_BITMAP_H_
  37.  
  38. #include <arch/types.h>
  39.  
  40. #define BITS2BYTES(bits)    (bits ? ((((bits)-1)>>3)+1) : 0)
  41.  
  42. typedef struct {
  43.     uint8_t *map;
  44.     size_t bits;
  45. } bitmap_t;
  46.  
  47. extern void bitmap_initialize(bitmap_t *bitmap, uint8_t *map, size_t bits);
  48. extern void bitmap_set_range(bitmap_t *bitmap, size_t start, size_t bits);
  49. extern void bitmap_clear_range(bitmap_t *bitmap, size_t start, size_t bits);
  50. extern void bitmap_copy(bitmap_t *dst, bitmap_t *src, size_t bits);
  51.  
  52. static inline int bitmap_get(bitmap_t *bitmap, size_t bit)
  53. {
  54.     if(bit >= bitmap->bits)
  55.         return 0;
  56.    
  57.     return !! ((bitmap->map)[bit/8] & (1 << (bit & 7)));
  58. }
  59.  
  60.  
  61. #endif
  62.  
  63. /** @}
  64.  */
  65.