718cf2ccb9
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
84 lines
3.5 KiB
C
84 lines
3.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2004, 2005 David Young. All rights reserved.
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*
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* Programmed for NetBSD by David Young.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of David Young may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David
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* Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* $DragonFly: src/sys/dev/netif/bwi/bitops.h,v 1.1 2007/09/08 06:15:54 sephe Exp $
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* $FreeBSD$
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*/
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#ifndef _BITOPS_H
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#define _BITOPS_H
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/*
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* __BIT(n): Return a bitmask with bit m set, where the least
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* significant bit is bit 0.
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*
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* __BITS(m, n): Return a bitmask with bits m through n, inclusive,
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* set. It does not matter whether m>n or m<=n. The
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* least significant bit is bit 0.
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*
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* A "bitfield" is a span of consecutive bits defined by a bitmask,
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* where 1s select the bits in the bitfield. __SHIFTIN, __SHIFTOUT,
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* and SHIFTOUT_MASK help read and write bitfields from device registers.
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*
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* __SHIFTIN(v, mask): Left-shift bits `v' into the bitfield
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* defined by `mask', and return them. No
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* side-effects.
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*
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* __SHIFTOUT(v, mask): Extract and return the bitfield selected
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* by `mask' from `v', right-shifting the
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* bits so that the rightmost selected bit
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* is at bit 0. No side-effects.
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*
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* __SHIFTOUT_MASK(mask): Right-shift the bits in `mask' so that
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* the rightmost non-zero bit is at bit
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* 0. This is useful for finding the
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* greatest unsigned value that a bitfield
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* can hold. No side-effects. Note that
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* SHIFTOUT_MASK(m) = SHIFTOUT(m, m).
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*/
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/* __BIT(n): nth bit, where __BIT(0) == 0x1. */
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#define __BIT(__n) (((__n) == 32) ? 0 : ((uint32_t)1 << (__n)))
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/* __BITS(m, n): bits m through n, m < n. */
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#define __BITS(__m, __n) \
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((__BIT(MAX((__m), (__n)) + 1) - 1) ^ (__BIT(MIN((__m), (__n))) - 1))
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/* Find least significant bit that is set */
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#define __LOWEST_SET_BIT(__mask) ((((__mask) - 1) & (__mask)) ^ (__mask))
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#define __SHIFTOUT(__x, __mask) (((__x) & (__mask)) / __LOWEST_SET_BIT(__mask))
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#define __SHIFTIN(__x, __mask) ((__x) * __LOWEST_SET_BIT(__mask))
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#define __SHIFTOUT_MASK(__mask) __SHIFTOUT((__mask), (__mask))
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#endif /* !_BITOPS_H */
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