param.h revision 51528
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 * $FreeBSD: head/sys/i386/include/param.h 51528 1999-09-22 04:11:55Z dillon $ 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#ifndef BLKDEV_IOSIZE 95#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 96#endif 97#ifndef DFLTPHYS 98#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 99#endif 100#ifndef MAXPHYS 101#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 102#endif 103 104#define IOPAGES 2 /* pages of i/o permission bitmap */ 105#define UPAGES 2 /* pages of u-area */ 106#define UPAGES_HOLE 2 /* pages of "hole" at top of user space where */ 107 /* the upages used to be. DO NOT CHANGE! */ 108 109/* 110 * Constants related to network buffer management. 111 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 112 * on machines that exchange pages of input or output buffers with mbuf 113 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 114 * of the hardware page size. 115 */ 116#ifndef MSIZE 117#define MSIZE 128 /* size of an mbuf */ 118#endif /* MSIZE */ 119 120#ifndef MCLSHIFT 121#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 122#endif /* MCLSHIFT */ 123#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 124#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 125 126/* 127 * Some macros for units conversion 128 */ 129 130/* clicks to bytes */ 131#define ctob(x) ((x)<<PAGE_SHIFT) 132 133/* bytes to clicks */ 134#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 135 136/* 137 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 138 * want to shift an unsigned type to avoid sign extension and we don't 139 * want to widen `bytes' unnecessarily. Assume that the result fits in 140 * a daddr_t. 141 */ 142#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 143 (sizeof (bytes) > sizeof(long) \ 144 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 145 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 146 147#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 148 ((off_t)(db) << DEV_BSHIFT) 149 150/* 151 * Mach derived conversion macros 152 */ 153#define trunc_page(x) ((x) & ~PAGE_MASK) 154#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 155#define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 156#define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 157 158#define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 159#define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 160 161#define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 162#define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 163 164#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 165 166#endif /* !_MACHINE_PARAM_H_ */ 167