param.h revision 44157
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 1.48 1999/01/07 06:35:18 peter Exp $ 38 */ 39 40#ifndef _MACHINE_PARAM_H_ 41#define _MACHINE_PARAM_H_ 42 43/* 44 * Machine dependent constants for Intel 386. 45 */ 46#define _MACHINE i386 47#define MACHINE "i386" 48#define _MACHINE_ARCH i386 49#define MACHINE_ARCH "i386" 50#define MID_MACHINE MID_I386 51 52/* 53 * OBJFORMAT_NAMES is a comma-separated list of the object formats 54 * that are supported on the architecture. 55 */ 56#define OBJFORMAT_NAMES "elf", "aout" 57#define OBJFORMAT_DEFAULT "elf" 58 59#ifdef SMP 60#define NCPUS 2 61#else 62#define NCPUS 1 63#endif 64 65/* 66 * Round p (pointer or byte index) up to a correctly-aligned value 67 * for all data types (int, long, ...). The result is unsigned int 68 * and must be cast to any desired pointer type. 69 */ 70#define ALIGNBYTES (sizeof(int) - 1) 71#define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) 72 73#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 74#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 75#define PAGE_MASK (PAGE_SIZE-1) 76#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 77 78#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 79#define PDRSHIFT 22 /* LOG2(NBPDR) */ 80#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 81#define PDRMASK (NBPDR-1) 82 83#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 84#define DEV_BSIZE (1<<DEV_BSHIFT) 85 86#define BLKDEV_IOSIZE 2048 87#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 88#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 89 90#define IOPAGES 2 /* pages of i/o permission bitmap */ 91#define UPAGES 2 /* pages of u-area */ 92#define UPAGES_HOLE 2 /* pages of "hole" at top of user space where */ 93 /* the upages used to be. DO NOT CHANGE! */ 94 95/* 96 * Constants related to network buffer management. 97 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 98 * on machines that exchange pages of input or output buffers with mbuf 99 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 100 * of the hardware page size. 101 */ 102#ifndef MSIZE 103#define MSIZE 128 /* size of an mbuf */ 104#endif /* MSIZE */ 105 106#ifndef MCLSHIFT 107#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 108#endif /* MCLSHIFT */ 109#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 110#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 111 112/* 113 * Some macros for units conversion 114 */ 115 116/* clicks to bytes */ 117#define ctob(x) ((x)<<PAGE_SHIFT) 118 119/* bytes to clicks */ 120#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 121 122/* 123 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 124 * want to shift an unsigned type to avoid sign extension and we don't 125 * want to widen `bytes' unnecessarily. Assume that the result fits in 126 * a daddr_t. 127 */ 128#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 129 (sizeof (bytes) > sizeof(long) \ 130 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 131 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 132 133#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 134 ((off_t)(db) << DEV_BSHIFT) 135 136/* 137 * Mach derived conversion macros 138 */ 139#define trunc_page(x) ((x) & ~PAGE_MASK) 140#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 141#define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 142#define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 143 144#define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 145#define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 146 147#define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 148#define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 149 150#define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 151 152#endif /* !_MACHINE_PARAM_H_ */ 153