param.h revision 66802
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 66802 2000-10-08 03:52:27Z bmilekic $ 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 MAXCPU 16 69#else 70#define MAXCPU 1 71#endif /* SMP */ 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#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 98#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 99 100#define IOPAGES 2 /* pages of i/o permission bitmap */ 101#define UPAGES 2 /* pages of u-area */ 102 103/* 104 * Constants related to network buffer management. 105 * MCLBYTES must be no larger than PAGE_SIZE. 106 */ 107#ifndef MSIZE 108#define MSIZE 256 /* size of an mbuf */ 109#endif /* MSIZE */ 110 111#ifndef MCLSHIFT 112#define MCLSHIFT 11 /* convert bytes to mbuf clusters */ 113#endif /* MCLSHIFT */ 114#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 115 116/* 117 * Some macros for units conversion 118 */ 119 120/* clicks to bytes */ 121#define ctob(x) ((x)<<PAGE_SHIFT) 122 123/* bytes to clicks */ 124#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 125 126/* 127 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 128 * want to shift an unsigned type to avoid sign extension and we don't 129 * want to widen `bytes' unnecessarily. Assume that the result fits in 130 * a daddr_t. 131 */ 132#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 133 (sizeof (bytes) > sizeof(long) \ 134 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 135 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 136 137#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 138 ((off_t)(db) << DEV_BSHIFT) 139 140/* 141 * Mach derived conversion macros 142 */ 143#define trunc_page(x) ((x) & ~PAGE_MASK) 144#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 145#define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 146#define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 147 148#define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 149#define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 150 151#define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 152#define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 153 154#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 155 156#endif /* !_MACHINE_PARAM_H_ */ 157