githubmirror/ndctl

util/bitmap.h
44 строки2 KB
Dan Williams
clarify copyright and license information
20 май 2017, 03:35
20 май 2017, 03:35796b6f3
/*
 * Copyright(c) 2015-2017 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */
#ifndef _NDCTL_BITMAP_H_
#define _NDCTL_BITMAP_H_

#include <util/size.h>
#include <ccan/short_types/short_types.h>

#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))

#define BIT(nr)			(1UL << (nr))
#define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
#define BITS_PER_BYTE		8
#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))

#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1)))

#define small_const_nbits(nbits) \
	(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)

unsigned long *bitmap_alloc(unsigned long nbits);
void bitmap_set(unsigned long *map, unsigned int start, int len);
void bitmap_clear(unsigned long *map, unsigned int start, int len);
int test_bit(unsigned int nr, const volatile unsigned long *addr);
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
			    unsigned long offset);
unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
				 unsigned long offset);
int bitmap_full(const unsigned long *src, unsigned int nbits);


#endif /* _NDCTL_BITMAP_H_ */