param.h revision 44364
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)param.h 5.8 (Berkeley) 6/28/91 37 * $Id: param.h,v 1.49 1999/02/19 19:34:48 luoqi Exp $ 38 */ 39 40#ifndef _MACHINE_PARAM_H_ 41#define _MACHINE_PARAM_H_ 42 43/* 44 * Machine dependent constants for Intel 386. 45 */ 46#ifndef _MACHINE 47#define _MACHINE i386 48#endif 49#ifndef MACHINE 50#define MACHINE "i386" 51#endif 52#ifndef _MACHINE_ARCH 53#define _MACHINE_ARCH i386 54#endif 55#ifndef MACHINE_ARCH 56#define MACHINE_ARCH "i386" 57#endif 58#define MID_MACHINE MID_I386 59 60/* 61 * OBJFORMAT_NAMES is a comma-separated list of the object formats 62 * that are supported on the architecture. 63 */ 64#define OBJFORMAT_NAMES "elf", "aout" 65#define OBJFORMAT_DEFAULT "elf" 66 67#ifdef SMP 68#define NCPUS 2 69#else 70#define NCPUS 1 71#endif 72 73/* 74 * Round p (pointer or byte index) up to a correctly-aligned value 75 * for all data types (int, long, ...). The result is unsigned int 76 * and must be cast to any desired pointer type. 77 */ 78#define ALIGNBYTES (sizeof(int) - 1) 79#define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) 80 81#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 82#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 83#define PAGE_MASK (PAGE_SIZE-1) 84#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 85 86#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 87#define PDRSHIFT 22 /* LOG2(NBPDR) */ 88#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 89#define PDRMASK (NBPDR-1) 90 91#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 92#define DEV_BSIZE (1<<DEV_BSHIFT) 93 94#define BLKDEV_IOSIZE 2048 95#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 96#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 97 98#define IOPAGES 2 /* pages of i/o permission bitmap */ 99#define UPAGES 2 /* pages of u-area */ 100#define UPAGES_HOLE 2 /* pages of "hole" at top of user space where */ 101 /* the upages used to be. DO NOT CHANGE! */ 102 103/* 104 * Constants related to network buffer management. 105 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 106 * on machines that exchange pages of input or output buffers with mbuf 107 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 108 * of the hardware page size. 109 */ 110#ifndef MSIZE 111#define MSIZE 128 /* size of an mbuf */ 112#endif /* MSIZE */ 113 114#ifndef MCLSHIFT 115#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 116#endif /* MCLSHIFT */ 117#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 118#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 119 120/* 121 * Some macros for units conversion 122 */ 123 124/* clicks to bytes */ 125#define ctob(x) ((x)<<PAGE_SHIFT) 126 127/* bytes to clicks */ 128#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 129 130/* 131 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 132 * want to shift an unsigned type to avoid sign extension and we don't 133 * want to widen `bytes' unnecessarily. Assume that the result fits in 134 * a daddr_t. 135 */ 136#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 137 (sizeof (bytes) > sizeof(long) \ 138 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 139 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 140 141#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 142 ((off_t)(db) << DEV_BSHIFT) 143 144/* 145 * Mach derived conversion macros 146 */ 147#define trunc_page(x) ((x) & ~PAGE_MASK) 148#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 149#define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 150#define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 151 152#define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 153#define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 154 155#define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 156#define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 157 158#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 159 160#endif /* !_MACHINE_PARAM_H_ */ 161