FreeBSD/Linux Kernel Cross Reference
sys/cddl/compat/opensolaris/sys/bitmap.h

     /*
      * 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
     *
     * $FreeBSD$
     */
    
    /*
     * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
    /*        All Rights Reserved   */
    
    
    #ifndef _COMPAT_OPENSOLARIS_SYS_BITMAP_H
    #define _COMPAT_OPENSOLARIS_SYS_BITMAP_H
    
    #include <sys/atomic.h>
    
    /*
     * Operations on bitmaps of arbitrary size
     * A bitmap is a vector of 1 or more ulong_t's.
     * The user of the package is responsible for range checks and keeping
     * track of sizes.
     */
    
    #ifdef _LP64
    #define BT_ULSHIFT      6 /* log base 2 of BT_NBIPUL, to extract word index */
    #define BT_ULSHIFT32    5 /* log base 2 of BT_NBIPUL, to extract word index */
    #else
    #define BT_ULSHIFT      5 /* log base 2 of BT_NBIPUL, to extract word index */
    #endif
    
    #define BT_NBIPUL       (1 << BT_ULSHIFT)       /* n bits per ulong_t */
    #define BT_ULMASK       (BT_NBIPUL - 1)         /* to extract bit index */
    
    #ifdef _LP64
    #define BT_NBIPUL32     (1 << BT_ULSHIFT32)     /* n bits per ulong_t */
    #define BT_ULMASK32     (BT_NBIPUL32 - 1)       /* to extract bit index */
    #define BT_ULMAXMASK    0xffffffffffffffff      /* used by bt_getlowbit */
    #else
    #define BT_ULMAXMASK    0xffffffff
    #endif
    
    /*
     * bitmap is a ulong_t *, bitindex an index_t
     *
     * The macros BT_WIM and BT_BIW internal; there is no need
     * for users of this package to use them.
     */
    
    /*
     * word in map
     */
    #define BT_WIM(bitmap, bitindex) \
            ((bitmap)[(bitindex) >> BT_ULSHIFT])
    /*
     * bit in word
     */
    #define BT_BIW(bitindex) \
            (1UL << ((bitindex) & BT_ULMASK))
    
    #ifdef _LP64
    #define BT_WIM32(bitmap, bitindex) \
            ((bitmap)[(bitindex) >> BT_ULSHIFT32])
    
    #define BT_BIW32(bitindex) \
            (1UL << ((bitindex) & BT_ULMASK32))
    #endif
    
    /*
     * These are public macros
     *
     * BT_BITOUL == n bits to n ulong_t's
     */
    #define BT_BITOUL(nbits) \
            (((nbits) + BT_NBIPUL - 1l) / BT_NBIPUL)
    #define BT_SIZEOFMAP(nbits) \
            (BT_BITOUL(nbits) * sizeof (ulong_t))
    #define BT_TEST(bitmap, bitindex) \
            ((BT_WIM((bitmap), (bitindex)) & BT_BIW(bitindex)) ? 1 : 0)
   #define BT_SET(bitmap, bitindex) \
           { BT_WIM((bitmap), (bitindex)) |= BT_BIW(bitindex); }
   #define BT_CLEAR(bitmap, bitindex) \
           { BT_WIM((bitmap), (bitindex)) &= ~BT_BIW(bitindex); }
   
   #ifdef _LP64
   #define BT_BITOUL32(nbits) \
           (((nbits) + BT_NBIPUL32 - 1l) / BT_NBIPUL32)
   #define BT_SIZEOFMAP32(nbits) \
           (BT_BITOUL32(nbits) * sizeof (uint_t))
   #define BT_TEST32(bitmap, bitindex) \
           ((BT_WIM32((bitmap), (bitindex)) & BT_BIW32(bitindex)) ? 1 : 0)
   #define BT_SET32(bitmap, bitindex) \
           { BT_WIM32((bitmap), (bitindex)) |= BT_BIW32(bitindex); }
   #define BT_CLEAR32(bitmap, bitindex) \
           { BT_WIM32((bitmap), (bitindex)) &= ~BT_BIW32(bitindex); }
   #endif /* _LP64 */
   
   #endif  /* _COMPAT_OPENSOLARIS_SYS_BITMAP_H */

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