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1200 jermar 1
/*
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 * Copyright (c) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genericadt
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_BITMAP_H_
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#define KERN_BITMAP_H_
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#include <arch/types.h>
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#define BITS2BYTES(bits)    (bits ? ((((bits)-1)>>3)+1) : 0)
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typedef struct {
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    uint8_t *map;
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    size_t bits;
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} bitmap_t;
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extern void bitmap_initialize(bitmap_t *bitmap, uint8_t *map, size_t bits);
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extern void bitmap_set_range(bitmap_t *bitmap, size_t start, size_t bits);
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extern void bitmap_clear_range(bitmap_t *bitmap, size_t start, size_t bits);
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extern void bitmap_copy(bitmap_t *dst, bitmap_t *src, size_t bits);
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static inline int bitmap_get(bitmap_t *bitmap, size_t bit)
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{
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    if(bit >= bitmap->bits)
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        return 0;
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    return !! ((bitmap->map)[bit/8] & (1 << (bit & 7)));
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}
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#endif
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/** @}
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 */