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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 The FreeBSD Foundation
*
* This software was developed by Björn Zeeb under sponsorship from
* the FreeBSD Foundation.
*
* 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
#ifndef _LINUXKPI_LINUX_BITFIELD_H
#define _LINUXKPI_LINUX_BITFIELD_H
#include <linux/types.h>
#include <asm/byteorder.h>
/* Use largest possible type. */
static inline uint64_t ___lsb(uint64_t f) { return (f & -f); }
static inline uint64_t ___bitmask(uint64_t f) { return (f / ___lsb(f)); }
#define _uX_get_bits(_n) \
static __inline uint ## _n ## _t \
u ## _n ## _get_bits(uint ## _n ## _t v, uint ## _n ## _t f) \
{ \
return ((v & f) / ___lsb(f)); \
}
_uX_get_bits(64)
_uX_get_bits(32)
_uX_get_bits(16)
_uX_get_bits(8)
#define _leX_get_bits(_n) \
static __inline uint ## _n ## _t \
le ## _n ## _get_bits(__le ## _n v, uint ## _n ## _t f) \
{ \
return ((le ## _n ## _to_cpu(v) & f) / ___lsb(f)); \
}
_leX_get_bits(64)
_leX_get_bits(32)
_leX_get_bits(16)
#define _uX_encode_bits(_n) \
static __inline uint ## _n ## _t \
u ## _n ## _encode_bits(uint ## _n ## _t v, uint ## _n ## _t f) \
{ \
return ((v & ___bitmask(f)) * ___lsb(f)); \
}
_uX_encode_bits(64)
_uX_encode_bits(32)
_uX_encode_bits(16)
_uX_encode_bits(8)
#define _leX_encode_bits(_n) \
static __inline uint ## _n ## _t \
le ## _n ## _encode_bits(__le ## _n v, uint ## _n ## _t f) \
{ \
return (cpu_to_le ## _n((v & ___bitmask(f)) * ___lsb(f))); \
}
_leX_encode_bits(64)
_leX_encode_bits(32)
_leX_encode_bits(16)
#define _leXp_replace_bits(_n) \
static __inline void \
le ## _n ## p_replace_bits(uint ## _n ## _t *p, \
uint ## _n ## _t v, uint ## _n ## _t f) \
{ \
*p = (*p & ~(cpu_to_le ## _n(f))) | \
le ## _n ## _encode_bits(v, f); \
}
_leXp_replace_bits(64)
_leXp_replace_bits(32)
_leXp_replace_bits(16)
#define _uXp_replace_bits(_n) \
static __inline void \
u ## _n ## p_replace_bits(uint ## _n ## _t *p, \
uint ## _n ## _t v, uint ## _n ## _t f) \
{ \
*p = (*p & ~f) | u ## _n ## _encode_bits(v, f); \
}
_uXp_replace_bits(64)
_uXp_replace_bits(32)
_uXp_replace_bits(16)
_uXp_replace_bits(8)
#define _uX_replace_bits(_n) \
static __inline uint ## _n ## _t \
u ## _n ## _replace_bits(uint ## _n ## _t p, \
uint ## _n ## _t v, uint ## _n ## _t f) \
{ \
return ((p & ~f) | u ## _n ## _encode_bits(v, f)); \
}
_uX_replace_bits(64)
_uX_replace_bits(32)
_uX_replace_bits(16)
_uX_replace_bits(8)
#define __bf_shf(x) (__builtin_ffsll(x) - 1)
#define FIELD_PREP(_mask, _value) \
(((typeof(_mask))(_value) << __bf_shf(_mask)) & (_mask))
#define FIELD_GET(_mask, _value) \
((typeof(_mask))(((_value) & (_mask)) >> __bf_shf(_mask)))
#endif /* _LINUXKPI_LINUX_BITFIELD_H */
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