bsd/i386/param.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*-
  29  * Copyright (c) 1990, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  * (c) UNIX System Laboratories, Inc.
  32  * All or some portions of this file are derived from material licensed
  33  * to the University of California by American Telephone and Telegraph
  34  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  35  * the permission of UNIX System Laboratories, Inc.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Berkeley and its contributors.
  49  * 4. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  *      @(#)param.h     8.1 (Berkeley) 4/4/95
  66  */
  67
  68 /*
  69  * Machine dependent constants for Intel 386.
  70  */
  71
  72 #ifndef _I386_PARAM_H_
  73 #define _I386_PARAM_H_
  74
  75 /*
  76  * Round p (pointer or byte index) up to a correctly-aligned value for all
  77  * data types (int, long, ...).   The result is unsigned int and must be
  78  * cast to any desired pointer type.
  79  */
  80 #define ALIGNBYTES      3
  81 #define ALIGN(p)        (((unsigned int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  82
  83 #define NBPG            4096            /* bytes/page */
  84 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  85 #define PGSHIFT         12              /* LOG2(NBPG) */
  86
  87 #define DEV_BSIZE       512
  88 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  89 #define BLKDEV_IOSIZE   2048
  90 #define MAXPHYS         (128 * 1024)    /* max raw I/O transfer size */
  91
  92 #define CLSIZE          1
  93 #define CLSIZELOG2      0
  94
  95 /*
  96  * Constants related to network buffer management.
  97  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  98  * on machines that exchange pages of input or output buffers with mbuf
  99  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 100  * of the hardware page size.
 101  */
 102 #define MSIZE           256             /* size of an mbuf */
 103 #define MCLBYTES        2048            /* large enough for ether MTU */
 104 #define MCLSHIFT        11
 105 #define MCLOFSET        (MCLBYTES - 1)
 106 #ifndef NMBCLUSTERS
 107 #ifdef GATEWAY
 108 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
 109 #else
 110 #define NMBCLUSTERS     ((1024 * 512) / MCLBYTES)       /* cl map size: 0.5MB */
 111 #endif
 112 #endif
 113
 114 /*
 115  * Some macros for units conversion
 116  */
 117 /* Core clicks (NeXT_page_size bytes) to segments and vice versa */
 118 #define ctos(x) (x)
 119 #define stoc(x) (x)
 120
 121 /* Core clicks (4096 bytes) to disk blocks */
 122 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
 123 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
 124 #define dtob(x) ((x)<<DEV_BSHIFT)
 125
 126 /* clicks to bytes */
 127 #define ctob(x) ((x)<<PGSHIFT)
 128
 129 /* bytes to clicks */
 130 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
 131
 132 #ifdef __APPLE__
 133 #define  btodb(bytes, devBlockSize)         \
 134         ((unsigned)(bytes) / devBlockSize)
 135 #define  dbtob(db, devBlockSize)            \
 136         ((unsigned)(db) * devBlockSize)
 137 #else
 138 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 139         ((unsigned)(bytes) >> DEV_BSHIFT)
 140 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 141         ((unsigned)(db) << DEV_BSHIFT)
 142 #endif
 143
 144 /*
 145  * Map a ``block device block'' to a file system block.
 146  * This should be device dependent, and will be if we
 147  * add an entry to cdevsw/bdevsw for that purpose.
 148  * For now though just use DEV_BSIZE.
 149  */
 150 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 151
 152 /*
 153  * Macros to decode (and encode) processor status word.
 154  */
 155 #define STATUS_WORD(rpl, ipl)   (((ipl) << 8) | (rpl))
 156 #define USERMODE(x)             (((x) & 3) == 3)
 157 #define BASEPRI(x)              (((x) & (255 << 8)) == 0)
 158
 159
 160 #if     defined(KERNEL) || defined(STANDALONE)
 161 #define DELAY(n) delay(n)
 162
 163 #else   /* defined(KERNEL) || defined(STANDALONE) */
 164 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 165 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 166
 167 #endif /* _I386_PARAM_H_ */