1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Copyright (c) 2014 by Delphix. All rights reserved. 29 */ 30 31 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 32 /* All Rights Reserved */ 33 34 35 #ifndef _SYS_BITMAP_H 36 #define _SYS_BITMAP_H 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 #include <sys/feature_tests.h> 43 #if defined(__GNUC__) && defined(_ASM_INLINES) && \ 44 (defined(__i386) || defined(__amd64)) 45 #include <asm/bitmap.h> 46 #endif 47 48 /* 49 * Operations on bitmaps of arbitrary size 50 * A bitmap is a vector of 1 or more ulong_t's. 51 * The user of the package is responsible for range checks and keeping 52 * track of sizes. 53 */ 54 55 #ifdef _LP64 56 #define BT_ULSHIFT 6 /* log base 2 of BT_NBIPUL, to extract word index */ 57 #define BT_ULSHIFT32 5 /* log base 2 of BT_NBIPUL, to extract word index */ 58 #else 59 #define BT_ULSHIFT 5 /* log base 2 of BT_NBIPUL, to extract word index */ 60 #endif 61 62 #define BT_NBIPUL (1 << BT_ULSHIFT) /* n bits per ulong_t */ 63 #define BT_ULMASK (BT_NBIPUL - 1) /* to extract bit index */ 64 65 #ifdef _LP64 66 #define BT_NBIPUL32 (1 << BT_ULSHIFT32) /* n bits per ulong_t */ 67 #define BT_ULMASK32 (BT_NBIPUL32 - 1) /* to extract bit index */ 68 #define BT_ULMAXMASK 0xffffffffffffffff /* used by bt_getlowbit */ 69 #else 70 #define BT_ULMAXMASK 0xffffffff 71 #endif 72 73 /* 74 * bitmap is a ulong_t *, bitindex an index_t 75 * 76 * The macros BT_WIM and BT_BIW internal; there is no need 77 * for users of this package to use them. 78 */ 79 80 /* 81 * word in map 82 */ 83 #define BT_WIM(bitmap, bitindex) \ 84 ((bitmap)[(bitindex) >> BT_ULSHIFT]) 85 /* 86 * bit in word 87 */ 88 #define BT_BIW(bitindex) \ 89 (1UL << ((bitindex) & BT_ULMASK)) 90 91 #ifdef _LP64 92 #define BT_WIM32(bitmap, bitindex) \ 93 ((bitmap)[(bitindex) >> BT_ULSHIFT32]) 94 95 #define BT_BIW32(bitindex) \ 96 (1UL << ((bitindex) & BT_ULMASK32)) 97 #endif 98 99 /* 100 * These are public macros 101 * 102 * BT_BITOUL == n bits to n ulong_t's 103 */ 104 #define BT_BITOUL(nbits) \ 105 (((nbits) + BT_NBIPUL - 1l) / BT_NBIPUL) 106 #define BT_SIZEOFMAP(nbits) \ 107 (BT_BITOUL(nbits) * sizeof (ulong_t)) 108 #define BT_TEST(bitmap, bitindex) \ 109 ((BT_WIM((bitmap), (bitindex)) & BT_BIW(bitindex)) ? 1 : 0) 110 #define BT_SET(bitmap, bitindex) \ 111 { BT_WIM((bitmap), (bitindex)) |= BT_BIW(bitindex); } 112 #define BT_CLEAR(bitmap, bitindex) \ 113 { BT_WIM((bitmap), (bitindex)) &= ~BT_BIW(bitindex); } 114 115 #ifdef _LP64 116 #define BT_BITOUL32(nbits) \ 117 (((nbits) + BT_NBIPUL32 - 1l) / BT_NBIPUL32) 118 #define BT_SIZEOFMAP32(nbits) \ 119 (BT_BITOUL32(nbits) * sizeof (uint_t)) 120 #define BT_TEST32(bitmap, bitindex) \ 121 ((BT_WIM32((bitmap), (bitindex)) & BT_BIW32(bitindex)) ? 1 : 0) 122 #define BT_SET32(bitmap, bitindex) \ 123 { BT_WIM32((bitmap), (bitindex)) |= BT_BIW32(bitindex); } 124 #define BT_CLEAR32(bitmap, bitindex) \ 125 { BT_WIM32((bitmap), (bitindex)) &= ~BT_BIW32(bitindex); } 126 #endif /* _LP64 */ 127 128 129 /* 130 * BIT_ONLYONESET is a private macro not designed for bitmaps of 131 * arbitrary size. u must be an unsigned integer/long. It returns 132 * true if one and only one bit is set in u. 133 */ 134 #define BIT_ONLYONESET(u) \ 135 ((((u) == 0) ? 0 : ((u) & ((u) - 1)) == 0)) 136 137 #if defined(_KERNEL) && !defined(_ASM) 138 #include <sys/atomic.h> 139 140 /* 141 * return next available bit index from map with specified number of bits 142 */ 143 extern index_t bt_availbit(ulong_t *bitmap, size_t nbits); 144 /* 145 * find the highest order bit that is on, and is within or below 146 * the word specified by wx 147 */ 148 extern int bt_gethighbit(ulong_t *mapp, int wx); 149 extern int bt_range(ulong_t *bitmap, size_t *pos1, size_t *pos2, 150 size_t end_pos); 151 /* 152 * Find highest and lowest one bit set. 153 * Returns bit number + 1 of bit that is set, otherwise returns 0. 154 * Low order bit is 0, high order bit is 31. 155 */ 156 extern int highbit(ulong_t); 157 extern int highbit64(uint64_t); 158 extern int lowbit(ulong_t); 159 extern int bt_getlowbit(ulong_t *bitmap, size_t start, size_t stop); 160 extern void bt_copy(ulong_t *, ulong_t *, ulong_t); 161 162 /* 163 * find the parity 164 */ 165 extern int odd_parity(ulong_t); 166 167 /* 168 * Atomically set/clear bits 169 * Atomic exclusive operations will set "result" to "-1" 170 * if the bit is already set/cleared. "result" will be set 171 * to 0 otherwise. 172 */ 173 #define BT_ATOMIC_SET(bitmap, bitindex) \ 174 { atomic_or_long(&(BT_WIM(bitmap, bitindex)), BT_BIW(bitindex)); } 175 #define BT_ATOMIC_CLEAR(bitmap, bitindex) \ 176 { atomic_and_long(&(BT_WIM(bitmap, bitindex)), ~BT_BIW(bitindex)); } 177 178 #define BT_ATOMIC_SET_EXCL(bitmap, bitindex, result) \ 179 { result = atomic_set_long_excl(&(BT_WIM(bitmap, bitindex)), \ 180 (bitindex) % BT_NBIPUL); } 181 #define BT_ATOMIC_CLEAR_EXCL(bitmap, bitindex, result) \ 182 { result = atomic_clear_long_excl(&(BT_WIM(bitmap, bitindex)), \ 183 (bitindex) % BT_NBIPUL); } 184 185 /* 186 * Extracts bits between index h (high, inclusive) and l (low, exclusive) from 187 * u, which must be an unsigned integer. 188 */ 189 #define BITX(u, h, l) (((u) >> (l)) & ((1LU << ((h) - (l) + 1LU)) - 1LU)) 190 191 #endif /* _KERNEL && !_ASM */ 192 193 #ifdef __cplusplus 194 } 195 #endif 196 197 #endif /* _SYS_BITMAP_H */ 198