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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 NVIDIA corporation & affiliates.
* Copyright (c) 2013 François Tigeot
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_HASH_H_
#define _LINUXKPI_LINUX_HASH_H_
#include <sys/hash.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <asm/types.h>
#include <linux/bitops.h>
static inline u64
hash_64(u64 val, u8 bits)
{
u64 ret;
u8 x;
ret = bits;
for (x = 0; x != sizeof(ret); x++) {
u64 chunk = (val >> (8 * x)) & 0xFF;
ret = HASHSTEP(ret, chunk);
}
return (ret >> (64 - bits));
}
static inline u32
hash_32(u32 val, u8 bits)
{
u32 ret;
u8 x;
ret = bits;
for (x = 0; x != sizeof(ret); x++) {
u32 chunk = (val >> (8 * x)) & 0xFF;
ret = HASHSTEP(ret, chunk);
}
return (ret >> (32 - bits));
}
#if BITS_PER_LONG == 64
#define hash_long(...) hash_64(__VA_ARGS__)
#else
#define hash_long(...) hash_32(__VA_ARGS__)
#endif
#endif /* _LINUXKPI_LINUX_HASH_H_ */
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