bsd/i386/param.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*-
  23  * Copyright (c) 1990, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  * (c) UNIX System Laboratories, Inc.
  26  * All or some portions of this file are derived from material licensed
  27  * to the University of California by American Telephone and Telegraph
  28  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  29  * the permission of UNIX System Laboratories, Inc.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  * 3. All advertising materials mentioning features or use of this software
  40  *    must display the following acknowledgement:
  41  *      This product includes software developed by the University of
  42  *      California, Berkeley and its contributors.
  43  * 4. Neither the name of the University nor the names of its contributors
  44  *    may be used to endorse or promote products derived from this software
  45  *    without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  *
  59  *      @(#)param.h     8.1 (Berkeley) 4/4/95
  60  */
  61
  62 /*
  63  * Machine dependent constants for Intel 386.
  64  */
  65
  66 #ifndef _I386_PARAM_H_
  67 #define _I386_PARAM_H_
  68
  69 /*
  70  * Round p (pointer or byte index) up to a correctly-aligned value for all
  71  * data types (int, long, ...).   The result is u_int and must be cast to
  72  * any desired pointer type.
  73  */
  74 #define ALIGNBYTES      3
  75 #define ALIGN(p)        (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
  76
  77 #define NBPG            4096            /* bytes/page */
  78 #define PGOFSET         (NBPG-1)        /* byte offset into page */
  79 #define PGSHIFT         12              /* LOG2(NBPG) */
  80
  81 #define DEV_BSIZE       512
  82 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
  83 #define BLKDEV_IOSIZE   2048
  84 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
  85
  86 #define STACK_GROWS_UP  0               /* stack grows to lower addresses */
  87
  88 #define CLSIZE          1
  89 #define CLSIZELOG2      0
  90
  91 /*
  92  * Constants related to network buffer management.
  93  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
  94  * on machines that exchange pages of input or output buffers with mbuf
  95  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
  96  * of the hardware page size.
  97  */
  98 #define MSIZE           256             /* size of an mbuf */
  99 #define MCLBYTES        2048            /* large enough for ether MTU */
 100 #define MCLSHIFT        11
 101 #define MCLOFSET        (MCLBYTES - 1)
 102 #ifndef NMBCLUSTERS
 103 #ifdef GATEWAY
 104 #define NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
 105 #else
 106 #define NMBCLUSTERS     ((1024 * 512) / MCLBYTES)       /* cl map size: 0.5MB */
 107 #endif
 108 #endif
 109
 110 /*
 111  * Some macros for units conversion
 112  */
 113 /* Core clicks (NeXT_page_size bytes) to segments and vice versa */
 114 #define ctos(x) (x)
 115 #define stoc(x) (x)
 116
 117 /* Core clicks (4096 bytes) to disk blocks */
 118 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
 119 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
 120 #define dtob(x) ((x)<<DEV_BSHIFT)
 121
 122 /* clicks to bytes */
 123 #define ctob(x) ((x)<<PGSHIFT)
 124
 125 /* bytes to clicks */
 126 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
 127
 128 #ifdef __APPLE__
 129 #define  btodb(bytes, devBlockSize)         \
 130         ((unsigned)(bytes) / devBlockSize)
 131 #define  dbtob(db, devBlockSize)            \
 132         ((unsigned)(db) * devBlockSize)
 133 #else
 134 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 135         ((unsigned)(bytes) >> DEV_BSHIFT)
 136 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 137         ((unsigned)(db) << DEV_BSHIFT)
 138 #endif
 139
 140 /*
 141  * Map a ``block device block'' to a file system block.
 142  * This should be device dependent, and will be if we
 143  * add an entry to cdevsw/bdevsw for that purpose.
 144  * For now though just use DEV_BSIZE.
 145  */
 146 #define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
 147
 148 /*
 149  * Macros to decode (and encode) processor status word.
 150  */
 151 #define STATUS_WORD(rpl, ipl)   (((ipl) << 8) | (rpl))
 152 #define USERMODE(x)             (((x) & 3) == 3)
 153 #define BASEPRI(x)              (((x) & (255 << 8)) == 0)
 154
 155
 156 #if     defined(KERNEL) || defined(STANDALONE)
 157 #define DELAY(n) delay(n)
 158
 159 #else   /* defined(KERNEL) || defined(STANDALONE) */
 160 #define DELAY(n)        { register int N = (n); while (--N > 0); }
 161 #endif  /* defined(KERNEL) || defined(STANDALONE) */
 162
 163 #endif /* _I386_PARAM_H_ */