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