| 1 | /*
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| 2 | * Copyright (c) 2006 Jakub Jermar
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| 3 | * All rights reserved.
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| 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 |
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| 29 | /** @addtogroup kernel_generic_adt
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_BITMAP_H_
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| 36 | #define KERN_BITMAP_H_
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| 37 |
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| 38 | #include <stddef.h>
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| 39 | #include <stdbool.h>
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| 40 | #include <stdint.h>
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| 41 |
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| 42 | #define BITMAP_ELEMENT 8
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| 43 | #define BITMAP_REMAINER 7
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| 44 |
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| 45 | typedef struct {
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| 46 | size_t elements;
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| 47 | uint8_t *bits;
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| 48 | size_t next_fit;
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| 49 | } bitmap_t;
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| 50 |
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| 51 | static inline void bitmap_set(bitmap_t *bitmap, size_t element,
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| 52 | unsigned int value)
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| 53 | {
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| 54 | if (element >= bitmap->elements)
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| 55 | return;
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| 56 |
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| 57 | size_t byte = element / BITMAP_ELEMENT;
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| 58 | uint8_t mask = 1 << (element & BITMAP_REMAINER);
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| 59 |
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| 60 | if (value) {
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| 61 | bitmap->bits[byte] |= mask;
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| 62 | } else {
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| 63 | bitmap->bits[byte] &= ~mask;
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| 64 | bitmap->next_fit = byte;
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| 65 | }
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| 66 | }
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| 67 |
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| 68 | static inline unsigned int bitmap_get(bitmap_t *bitmap, size_t element)
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| 69 | {
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| 70 | if (element >= bitmap->elements)
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| 71 | return 0;
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| 72 |
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| 73 | size_t byte = element / BITMAP_ELEMENT;
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| 74 | uint8_t mask = 1 << (element & BITMAP_REMAINER);
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| 75 |
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| 76 | return !!((bitmap->bits)[byte] & mask);
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| 77 | }
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| 78 |
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| 79 | extern size_t bitmap_size(size_t);
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| 80 | extern void bitmap_initialize(bitmap_t *, size_t, void *);
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| 81 |
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| 82 | extern void bitmap_set_range(bitmap_t *, size_t, size_t);
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| 83 | extern void bitmap_clear_range(bitmap_t *, size_t, size_t);
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| 84 |
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| 85 | extern bool bitmap_allocate_range(bitmap_t *, size_t, size_t, size_t, size_t,
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| 86 | size_t *);
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| 87 | extern void bitmap_copy(bitmap_t *, bitmap_t *, size_t);
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| 88 |
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| 89 | #endif
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| 90 |
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| 91 | /** @}
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| 92 | */
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