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/* $OpenBSD: bitops.h,v 1.1 2019/04/14 10:14:53 jsg Exp $ */
/*
* Copyright (c) 2013, 2014, 2015 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _LINUX_BITOPS_H
#define _LINUX_BITOPS_H
#include <sys/types.h>
#include <sys/param.h>
#include <asm/bitsperlong.h>
#include <linux/atomic.h>
#define BIT(x) (1UL << (x))
#define BIT_ULL(x) (1ULL << (x))
#define BITS_PER_BYTE 8
#define GENMASK(h, l) (((~0UL) >> (BITS_PER_LONG - (h) - 1)) & ((~0UL) << (l)))
#define GENMASK_ULL(h, l) (((~0ULL) >> (BITS_PER_LONG_LONG - (h) - 1)) & ((~0ULL) << (l)))
#define BITS_TO_LONGS(x) howmany((x), 8 * sizeof(long))
static inline uint8_t
hweight8(uint32_t x)
{
x = (x & 0x55) + ((x & 0xaa) >> 1);
x = (x & 0x33) + ((x & 0xcc) >> 2);
x = (x + (x >> 4)) & 0x0f;
return (x);
}
static inline uint16_t
hweight16(uint32_t x)
{
x = (x & 0x5555) + ((x & 0xaaaa) >> 1);
x = (x & 0x3333) + ((x & 0xcccc) >> 2);
x = (x + (x >> 4)) & 0x0f0f;
x = (x + (x >> 8)) & 0x00ff;
return (x);
}
static inline uint32_t
hweight32(uint32_t x)
{
x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
x = (x + (x >> 4)) & 0x0f0f0f0f;
x = (x + (x >> 8));
x = (x + (x >> 16)) & 0x000000ff;
return x;
}
static inline uint32_t
hweight64(uint64_t x)
{
x = (x & 0x5555555555555555ULL) + ((x & 0xaaaaaaaaaaaaaaaaULL) >> 1);
x = (x & 0x3333333333333333ULL) + ((x & 0xccccccccccccccccULL) >> 2);
x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
x = (x + (x >> 8));
x = (x + (x >> 16));
x = (x + (x >> 32)) & 0x000000ff;
return x;
}
static inline uint64_t
sign_extend64(uint64_t value, int index)
{
uint8_t shift = 63 - index;
return ((int64_t)(value << shift) >> shift);
}
static inline int
fls64(long long mask)
{
int bit;
if (mask == 0)
return (0);
for (bit = 1; mask != 1; bit++)
mask = (unsigned long long)mask >> 1;
return (bit);
}
static inline uint32_t
ror32(uint32_t word, unsigned int shift)
{
return (word >> shift) | (word << (32 - shift));
}
#endif
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