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1200 | jermar | 1 | /* |
2071 | jermar | 2 | * Copyright (c) 2006 Jakub Jermar |
1200 | jermar | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
1888 | jermar | 29 | /** @addtogroup genericadt |
1702 | cejka | 30 | * @{ |
31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
1888 | jermar | 35 | #ifndef KERN_BITMAP_H_ |
36 | #define KERN_BITMAP_H_ |
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1200 | jermar | 37 | |
38 | #include <arch/types.h> |
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39 | |||
1251 | jermar | 40 | #define BITS2BYTES(bits) (bits ? ((((bits)-1)>>3)+1) : 0) |
1200 | jermar | 41 | |
42 | typedef struct { |
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1780 | jermar | 43 | uint8_t *map; |
4692 | svoboda | 44 | size_t bits; |
1200 | jermar | 45 | } bitmap_t; |
46 | |||
4692 | svoboda | 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); |
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49 | extern void bitmap_clear_range(bitmap_t *bitmap, size_t start, size_t bits); |
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50 | extern void bitmap_copy(bitmap_t *dst, bitmap_t *src, size_t bits); |
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1200 | jermar | 51 | |
4692 | svoboda | 52 | static inline int bitmap_get(bitmap_t *bitmap, size_t bit) |
3675 | svoboda | 53 | { |
54 | if(bit >= bitmap->bits) |
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55 | return 0; |
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4692 | svoboda | 56 | |
3675 | svoboda | 57 | return !! ((bitmap->map)[bit/8] & (1 << (bit & 7))); |
58 | } |
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59 | |||
60 | |||
1200 | jermar | 61 | #endif |
1702 | cejka | 62 | |
1888 | jermar | 63 | /** @} |
1702 | cejka | 64 | */ |