bsd/i386/param.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*-
  26  * Copyright (c) 1990, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  * (c) UNIX System Laboratories, Inc.
  29  * All or some portions of this file are derived from material licensed
  30  * to the University of California by American Telephone and Telegraph
  31  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  32  * the permission of UNIX System Laboratories, Inc.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by the University of
  45  *      California, Berkeley and its contributors.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)param.h     8.1 (Berkeley) 4/4/95
  63  */
  64
  65 /*
  66  * Machine dependent constants for Intel 386.
  67  */
  68
  69 #ifndef _I386_PARAM_H_
  70 #define _I386_PARAM_H_
  71
  72 /*
  73  * Round p (pointer or byte index) up to a correctly-aligned value for all
  74  * data types (int, long, ...).   The result is u_int and must be cast to
  75  * any desired pointer type.
  76  */
  77 #define ALIGNBYTES      3
  78 #define ALIGN(p)        (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  79
  80 #define NBPG            4096            /* bytes/page */
  81 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  82 #define PGSHIFT         12              /* LOG2(NBPG) */
  83
  84 #define DEV_BSIZE       512
  85 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  86 #define BLKDEV_IOSIZE   2048
  87 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  88
  89 #define STACK_GROWS_UP  0               /* stack grows to lower addresses */
  90
  91 #define CLSIZE          1
  92 #define CLSIZELOG2      0
  93
  94 /*
  95  * Constants related to network buffer management.
  96  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  97  * on machines that exchange pages of input or output buffers with mbuf
  98  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  99  * of the hardware page size.
 100  */
 101 #define MSIZE           256             /* size of an mbuf */
 102 #define MCLBYTES        2048            /* large enough for ether MTU */
 103 #define MCLSHIFT        11
 104 #define MCLOFSET        (MCLBYTES - 1)
 105 #ifndef NMBCLUSTERS
 106 #ifdef GATEWAY
 107 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
 108 #else
 109 #define NMBCLUSTERS     ((1024 * 512) / MCLBYTES)       /* cl map size: 0.5MB */
 110 #endif
 111 #endif
 112
 113 /*
 114  * Some macros for units conversion
 115  */
 116 /* Core clicks (NeXT_page_size bytes) to segments and vice versa */
 117 #define ctos(x) (x)
 118 #define stoc(x) (x)
 119
 120 /* Core clicks (4096 bytes) to disk blocks */
 121 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
 122 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
 123 #define dtob(x) ((x)<<DEV_BSHIFT)
 124
 125 /* clicks to bytes */
 126 #define ctob(x) ((x)<<PGSHIFT)
 127
 128 /* bytes to clicks */
 129 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
 130
 131 #ifdef __APPLE__
 132 #define  btodb(bytes, devBlockSize)         \
 133         ((unsigned)(bytes) / devBlockSize)
 134 #define  dbtob(db, devBlockSize)            \
 135         ((unsigned)(db) * devBlockSize)
 136 #else
 137 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 138         ((unsigned)(bytes) >> DEV_BSHIFT)
 139 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 140         ((unsigned)(db) << DEV_BSHIFT)
 141 #endif
 142
 143 /*
 144  * Map a ``block device block'' to a file system block.
 145  * This should be device dependent, and will be if we
 146  * add an entry to cdevsw/bdevsw for that purpose.
 147  * For now though just use DEV_BSIZE.
 148  */
 149 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 150
 151 /*
 152  * Macros to decode (and encode) processor status word.
 153  */
 154 #define STATUS_WORD(rpl, ipl)   (((ipl) << 8) | (rpl))
 155 #define USERMODE(x)             (((x) & 3) == 3)
 156 #define BASEPRI(x)              (((x) & (255 << 8)) == 0)
 157
 158
 159 #if     defined(KERNEL) || defined(STANDALONE)
 160 #define DELAY(n) delay(n)
 161
 162 #else   /* defined(KERNEL) || defined(STANDALONE) */
 163 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 164 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 165
 166 #endif /* _I386_PARAM_H_ */