usr/src/uts/common/sys/bitmap.h

   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  * Copyright 2017 RackTop Systems.
  30  */
  31
  32 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  33 /*        All Rights Reserved   */
  34
  35
  36 #ifndef _SYS_BITMAP_H
  37 #define _SYS_BITMAP_H
  38
  39 #ifdef  __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 #include <sys/feature_tests.h>
  44 #if defined(__GNUC__) && defined(_ASM_INLINES) && \
  45         (defined(__i386) || defined(__amd64))
  46 #include <asm/bitmap.h>
  47 #endif
  48
  49 /*
  50  * Operations on bitmaps of arbitrary size
  51  * A bitmap is a vector of 1 or more ulong_t's.
  52  * The user of the package is responsible for range checks and keeping
  53  * track of sizes.
  54  */
  55
  56 #ifdef _LP64
  57 #define BT_ULSHIFT      6 /* log base 2 of BT_NBIPUL, to extract word index */
  58 #define BT_ULSHIFT32    5 /* log base 2 of BT_NBIPUL, to extract word index */
  59 #else
  60 #define BT_ULSHIFT      5 /* log base 2 of BT_NBIPUL, to extract word index */
  61 #endif
  62
  63 #define BT_NBIPUL       (1 << BT_ULSHIFT)       /* n bits per ulong_t */
  64 #define BT_ULMASK       (BT_NBIPUL - 1)         /* to extract bit index */
  65
  66 #ifdef _LP64
  67 #define BT_NBIPUL32     (1 << BT_ULSHIFT32)     /* n bits per ulong_t */
  68 #define BT_ULMASK32     (BT_NBIPUL32 - 1)       /* to extract bit index */
  69 #define BT_ULMAXMASK    0xffffffffffffffff      /* used by bt_getlowbit */
  70 #else
  71 #define BT_ULMAXMASK    0xffffffff
  72 #endif
  73
  74 /*
  75  * bitmap is a ulong_t *, bitindex an index_t
  76  *
  77  * The macros BT_WIM and BT_BIW internal; there is no need
  78  * for users of this package to use them.
  79  */
  80
  81 /*
  82  * word in map
  83  */
  84 #define BT_WIM(bitmap, bitindex) \
  85         ((bitmap)[(bitindex) >> BT_ULSHIFT])
  86 /*
  87  * bit in word
  88  */
  89 #define BT_BIW(bitindex) \
  90         (1UL << ((bitindex) & BT_ULMASK))
  91
  92 #ifdef _LP64
  93 #define BT_WIM32(bitmap, bitindex) \
  94         ((bitmap)[(bitindex) >> BT_ULSHIFT32])
  95
  96 #define BT_BIW32(bitindex) \
  97         (1UL << ((bitindex) & BT_ULMASK32))
  98 #endif
  99
 100 /*
 101  * These are public macros
 102  *
 103  * BT_BITOUL == n bits to n ulong_t's
 104  */
 105 #define BT_BITOUL(nbits) \
 106         (((nbits) + BT_NBIPUL - 1l) / BT_NBIPUL)
 107 #define BT_SIZEOFMAP(nbits) \
 108         (BT_BITOUL(nbits) * sizeof (ulong_t))
 109 #define BT_TEST(bitmap, bitindex) \
 110         ((BT_WIM((bitmap), (bitindex)) & BT_BIW(bitindex)) ? 1 : 0)
 111 #define BT_SET(bitmap, bitindex) \
 112         { BT_WIM((bitmap), (bitindex)) |= BT_BIW(bitindex); }
 113 #define BT_CLEAR(bitmap, bitindex) \
 114         { BT_WIM((bitmap), (bitindex)) &= ~BT_BIW(bitindex); }
 115
 116 #ifdef _LP64
 117 #define BT_BITOUL32(nbits) \
 118         (((nbits) + BT_NBIPUL32 - 1l) / BT_NBIPUL32)
 119 #define BT_SIZEOFMAP32(nbits) \
 120         (BT_BITOUL32(nbits) * sizeof (uint_t))
 121 #define BT_TEST32(bitmap, bitindex) \
 122         ((BT_WIM32((bitmap), (bitindex)) & BT_BIW32(bitindex)) ? 1 : 0)
 123 #define BT_SET32(bitmap, bitindex) \
 124         { BT_WIM32((bitmap), (bitindex)) |= BT_BIW32(bitindex); }
 125 #define BT_CLEAR32(bitmap, bitindex) \
 126         { BT_WIM32((bitmap), (bitindex)) &= ~BT_BIW32(bitindex); }
 127 #endif /* _LP64 */
 128
 129
 130 /*
 131  * BIT_ONLYONESET is a private macro not designed for bitmaps of
 132  * arbitrary size.  u must be an unsigned integer/long.  It returns
 133  * true if one and only one bit is set in u.
 134  */
 135 #define BIT_ONLYONESET(u) \
 136         ((((u) == 0) ? 0 : ((u) & ((u) - 1)) == 0))
 137
 138 #if (defined(_KERNEL) || defined(_FAKE_KERNEL)) && !defined(_ASM)
 139 #include <sys/atomic.h>
 140
 141 /*
 142  * return next available bit index from map with specified number of bits
 143  */
 144 extern index_t  bt_availbit(ulong_t *bitmap, size_t nbits);
 145 /*
 146  * find the highest order bit that is on, and is within or below
 147  * the word specified by wx
 148  */
 149 extern int      bt_gethighbit(ulong_t *mapp, int wx);
 150 extern int      bt_range(ulong_t *bitmap, size_t *pos1, size_t *pos2,
 151                         size_t end_pos);
 152 /*
 153  * Find highest and lowest one bit set.
 154  *      Returns bit number + 1 of bit that is set, otherwise returns 0.
 155  * Low order bit is 0, high order bit is 31.
 156  */
 157 extern int      highbit(ulong_t);
 158 extern int      highbit64(uint64_t);
 159 extern int      lowbit(ulong_t);
 160 extern int      bt_getlowbit(ulong_t *bitmap, size_t start, size_t stop);
 161 extern void     bt_copy(ulong_t *, ulong_t *, ulong_t);
 162
 163 /*
 164  * find the parity
 165  */
 166 extern int      odd_parity(ulong_t);
 167
 168 /*
 169  * Atomically set/clear bits
 170  * Atomic exclusive operations will set "result" to "-1"
 171  * if the bit is already set/cleared. "result" will be set
 172  * to 0 otherwise.
 173  */
 174 #define BT_ATOMIC_SET(bitmap, bitindex) \
 175         { atomic_or_ulong(&(BT_WIM(bitmap, bitindex)), BT_BIW(bitindex)); }
 176 #define BT_ATOMIC_CLEAR(bitmap, bitindex) \
 177         { atomic_and_ulong(&(BT_WIM(bitmap, bitindex)), ~BT_BIW(bitindex)); }
 178
 179 #define BT_ATOMIC_SET_EXCL(bitmap, bitindex, result) \
 180         { result = atomic_set_long_excl(&(BT_WIM(bitmap, bitindex)),    \
 181             (bitindex) % BT_NBIPUL); }
 182 #define BT_ATOMIC_CLEAR_EXCL(bitmap, bitindex, result) \
 183         { result = atomic_clear_long_excl(&(BT_WIM(bitmap, bitindex)),  \
 184             (bitindex) % BT_NBIPUL); }
 185
 186 /*
 187  * Extracts bits between index h (high, inclusive) and l (low, exclusive) from
 188  * u, which must be an unsigned integer.
 189  */
 190 #define BITX(u, h, l)   (((u) >> (l)) & ((1LU << ((h) - (l) + 1LU)) - 1LU))
 191
 192 #endif  /* (_KERNEL || _FAKE_KERNEL) && !_ASM */
 193
 194 #ifdef  __cplusplus
 195 }
 196 #endif
 197
 198 #endif  /* _SYS_BITMAP_H */