90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
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* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
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* Copyright 2013 Saso Kiselkov. All rights reserved.
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* Copyright (c) 2014 Integros [integros.com]
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* Copyright 2017 Joyent, Inc.
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* Copyright (c) 2017 Datto Inc.
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*/
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#ifndef _SYS_BITOPS_H
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#define _SYS_BITOPS_H
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* General-purpose 32-bit and 64-bit bitfield encodings.
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*/
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#define BF32_DECODE(x, low, len) P2PHASE((x) >> (low), 1U << (len))
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#define BF64_DECODE(x, low, len) P2PHASE((x) >> (low), 1ULL << (len))
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#define BF32_ENCODE(x, low, len) (P2PHASE((x), 1U << (len)) << (low))
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#define BF64_ENCODE(x, low, len) (P2PHASE((x), 1ULL << (len)) << (low))
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#define BF32_GET(x, low, len) BF32_DECODE(x, low, len)
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#define BF64_GET(x, low, len) BF64_DECODE(x, low, len)
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#define BF32_SET(x, low, len, val) do { \
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ASSERT3U(val, <, 1U << (len)); \
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ASSERT3U(low + len, <=, 32); \
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(x) ^= BF32_ENCODE((x >> low) ^ (val), low, len); \
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_NOTE(CONSTCOND) } while (0)
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#define BF64_SET(x, low, len, val) do { \
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ASSERT3U(val, <, 1ULL << (len)); \
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ASSERT3U(low + len, <=, 64); \
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((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len)); \
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_NOTE(CONSTCOND) } while (0)
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#define BF32_GET_SB(x, low, len, shift, bias) \
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((BF32_GET(x, low, len) + (bias)) << (shift))
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#define BF64_GET_SB(x, low, len, shift, bias) \
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((BF64_GET(x, low, len) + (bias)) << (shift))
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/*
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* We use ASSERT3U instead of ASSERT in these macros to prevent a lint error in
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* the case where val is a constant. We can't fix ASSERT because it's used as
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* an expression in several places in the kernel; as a result, changing it to
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* the do{} while() syntax to allow us to _NOTE the CONSTCOND is not an option.
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*/
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#define BF32_SET_SB(x, low, len, shift, bias, val) do { \
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ASSERT3U(IS_P2ALIGNED(val, 1U << shift), !=, B_FALSE); \
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ASSERT3S((val) >> (shift), >=, bias); \
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BF32_SET(x, low, len, ((val) >> (shift)) - (bias)); \
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_NOTE(CONSTCOND) } while (0)
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#define BF64_SET_SB(x, low, len, shift, bias, val) do { \
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ASSERT3U(IS_P2ALIGNED(val, 1ULL << shift), !=, B_FALSE); \
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ASSERT3S((val) >> (shift), >=, bias); \
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BF64_SET(x, low, len, ((val) >> (shift)) - (bias)); \
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_NOTE(CONSTCOND) } while (0)
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_BITOPS_H */
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