bsd/i386/param.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*-
  31  * Copyright (c) 1990, 1993
  32  *      The Regents of the University of California.  All rights reserved.
  33  * (c) UNIX System Laboratories, Inc.
  34  * All or some portions of this file are derived from material licensed
  35  * to the University of California by American Telephone and Telegraph
  36  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  37  * the permission of UNIX System Laboratories, Inc.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  * 1. Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  * 2. Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in the
  46  *    documentation and/or other materials provided with the distribution.
  47  * 3. All advertising materials mentioning features or use of this software
  48  *    must display the following acknowledgement:
  49  *      This product includes software developed by the University of
  50  *      California, Berkeley and its contributors.
  51  * 4. Neither the name of the University nor the names of its contributors
  52  *    may be used to endorse or promote products derived from this software
  53  *    without specific prior written permission.
  54  *
  55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  65  * SUCH DAMAGE.
  66  *
  67  *      @(#)param.h     8.1 (Berkeley) 4/4/95
  68  */
  69
  70 /*
  71  * Machine dependent constants for Intel 386.
  72  */
  73
  74 #ifndef _I386_PARAM_H_
  75 #define _I386_PARAM_H_
  76
  77 /*
  78  * Round p (pointer or byte index) up to a correctly-aligned value for all
  79  * data types (int, long, ...).   The result is unsigned int and must be
  80  * cast to any desired pointer type.
  81  */
  82 #define ALIGNBYTES      3
  83 #define ALIGN(p)        (((unsigned int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  84
  85 #define NBPG            4096            /* bytes/page */
  86 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  87 #define PGSHIFT         12              /* LOG2(NBPG) */
  88
  89 #define DEV_BSIZE       512
  90 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  91 #define BLKDEV_IOSIZE   2048
  92 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  93
  94 #define CLSIZE          1
  95 #define CLSIZELOG2      0
  96
  97 /*
  98  * Constants related to network buffer management.
  99  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
 100  * on machines that exchange pages of input or output buffers with mbuf
 101  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 102  * of the hardware page size.
 103  */
 104 #define MSIZE           256             /* size of an mbuf */
 105 #define MCLBYTES        2048            /* large enough for ether MTU */
 106 #define MCLSHIFT        11
 107 #define MCLOFSET        (MCLBYTES - 1)
 108 #ifndef NMBCLUSTERS
 109 #ifdef GATEWAY
 110 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
 111 #else
 112 #define NMBCLUSTERS     ((1024 * 512) / MCLBYTES)       /* cl map size: 0.5MB */
 113 #endif
 114 #endif
 115
 116 /*
 117  * Some macros for units conversion
 118  */
 119 /* Core clicks (NeXT_page_size bytes) to segments and vice versa */
 120 #define ctos(x) (x)
 121 #define stoc(x) (x)
 122
 123 /* Core clicks (4096 bytes) to disk blocks */
 124 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
 125 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
 126 #define dtob(x) ((x)<<DEV_BSHIFT)
 127
 128 /* clicks to bytes */
 129 #define ctob(x) ((x)<<PGSHIFT)
 130
 131 /* bytes to clicks */
 132 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
 133
 134 #ifdef __APPLE__
 135 #define  btodb(bytes, devBlockSize)         \
 136         ((unsigned)(bytes) / devBlockSize)
 137 #define  dbtob(db, devBlockSize)            \
 138         ((unsigned)(db) * devBlockSize)
 139 #else
 140 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 141         ((unsigned)(bytes) >> DEV_BSHIFT)
 142 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 143         ((unsigned)(db) << DEV_BSHIFT)
 144 #endif
 145
 146 /*
 147  * Map a ``block device block'' to a file system block.
 148  * This should be device dependent, and will be if we
 149  * add an entry to cdevsw/bdevsw for that purpose.
 150  * For now though just use DEV_BSIZE.
 151  */
 152 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 153
 154 /*
 155  * Macros to decode (and encode) processor status word.
 156  */
 157 #define STATUS_WORD(rpl, ipl)   (((ipl) << 8) | (rpl))
 158 #define USERMODE(x)             (((x) & 3) == 3)
 159 #define BASEPRI(x)              (((x) & (255 << 8)) == 0)
 160
 161
 162 #if     defined(KERNEL) || defined(STANDALONE)
 163 #define DELAY(n) delay(n)
 164
 165 #else   /* defined(KERNEL) || defined(STANDALONE) */
 166 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 167 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 168
 169 #endif /* _I386_PARAM_H_ */