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/* GPLv2 or OpenIB.org BSD (MIT) See COPYING file */
#ifndef UTIL_BITMAP_H
#define UTIL_BITMAP_H
#include <stdlib.h>
#include <stdbool.h>
#include <limits.h>
#include <string.h>
#include <assert.h>
#include "util.h"
#define BMP_DECLARE(name, nbits) \
unsigned long (name)[BITS_TO_LONGS((nbits))]
unsigned long bitmap_find_first_bit(const unsigned long *bmp,
unsigned long start, unsigned long end);
void bitmap_zero_region(unsigned long *bmp, unsigned long start,
unsigned long end);
void bitmap_fill_region(unsigned long *bmp, unsigned long start,
unsigned long end);
unsigned long bitmap_find_free_region(unsigned long *bmp,
unsigned long nbits,
unsigned long region_size);
static inline void bitmap_fill(unsigned long *bmp, unsigned long nbits)
{
unsigned long size = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
memset(bmp, 0xff, size);
}
static inline void bitmap_zero(unsigned long *bmp, unsigned long nbits)
{
unsigned long size = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
memset(bmp, 0, size);
}
static inline bool bitmap_empty(const unsigned long *bmp, unsigned long nbits)
{
unsigned long i;
unsigned long mask = ULONG_MAX;
assert(nbits);
for (i = 0; i < BITS_TO_LONGS(nbits) - 1; i++) {
if (bmp[i] != 0)
return false;
}
if (nbits % BITS_PER_LONG)
mask = (1UL << (nbits % BITS_PER_LONG)) - 1;
return (bmp[i] & mask) ? false : true;
}
static inline bool bitmap_full(const unsigned long *bmp, unsigned long nbits)
{
unsigned long i;
unsigned long mask = ULONG_MAX;
assert(nbits);
for (i = 0; i < BITS_TO_LONGS(nbits) - 1; i++) {
if (bmp[i] != -1UL)
return false;
}
if (nbits % BITS_PER_LONG)
mask = (1UL << (nbits % BITS_PER_LONG)) - 1;
return ((bmp[i] & mask) ^ (mask)) ? false : true;
}
static inline void bitmap_set_bit(unsigned long *bmp, unsigned long idx)
{
bmp[(idx / BITS_PER_LONG)] |= (1UL << (idx % BITS_PER_LONG));
}
static inline void bitmap_clear_bit(unsigned long *bmp, unsigned long idx)
{
bmp[(idx / BITS_PER_LONG)] &= ~(1UL << (idx % BITS_PER_LONG));
}
static inline bool bitmap_test_bit(const unsigned long *bmp, unsigned long idx)
{
return !!(bmp[(idx / BITS_PER_LONG)] &
(1UL << (idx % BITS_PER_LONG)));
}
static inline unsigned long *bitmap_alloc0(unsigned long size)
{
unsigned long *bmp;
bmp = calloc(BITS_TO_LONGS(size), sizeof(long));
if (!bmp)
return NULL;
return bmp;
}
static inline unsigned long *bitmap_alloc1(unsigned long size)
{
unsigned long *bmp;
bmp = bitmap_alloc0(size);
if (!bmp)
return NULL;
bitmap_fill(bmp, size);
return bmp;
}
#endif
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