param.h revision 28921
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 1.16 1997/08/30 01:22:01 smp Exp smp $ 38 */ 39 40#ifndef _MACHINE_PARAM_H_ 41#define _MACHINE_PARAM_H_ 42 43/* 44 * Machine dependent constants for Intel 386. 45 */ 46 47#define MACHINE "i386" 48#ifdef SMP 49#define NCPUS 2 50#else 51#define NCPUS 1 52#endif 53#define MID_MACHINE MID_I386 54 55#ifndef LOCORE 56 57/* 58 * Round p (pointer or byte index) up to a correctly-aligned value 59 * for all data types (int, long, ...). The result is unsigned int 60 * and must be cast to any desired pointer type. 61 */ 62#define ALIGNBYTES (sizeof(int) - 1) 63#define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) 64 65#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 66#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 67#define PAGE_MASK (PAGE_SIZE-1) 68#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 69 70#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 71#define PDRSHIFT 22 /* LOG2(NBPDR) */ 72#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 73#define PDRMASK (NBPDR-1) 74 75#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 76#define DEV_BSIZE (1<<DEV_BSHIFT) 77 78#define BLKDEV_IOSIZE 2048 79#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 80 81#define IOPAGES 2 /* pages of i/o permission bitmap */ 82#define UPAGES 2 /* pages of u-area */ 83#define UPAGES_HOLE 2 /* pages of "hole" at top of user space where */ 84 /* the upages used to be. DO NOT CHANGE! */ 85 86/* 87 * Constants related to network buffer management. 88 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 89 * on machines that exchange pages of input or output buffers with mbuf 90 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 91 * of the hardware page size. 92 */ 93#ifndef MSIZE 94#define MSIZE 128 /* size of an mbuf */ 95#endif /* MSIZE */ 96 97#ifndef MCLSHIFT 98#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 99#endif /* MCLSHIFT */ 100#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 101#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 102 103/* 104 * Some macros for units conversion 105 */ 106 107/* clicks to bytes */ 108#define ctob(x) ((x)<<PAGE_SHIFT) 109 110/* bytes to clicks */ 111#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) 112 113/* 114 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 115 * want to shift an unsigned type to avoid sign extension and we don't 116 * want to widen `bytes' unnecessarily. Assume that the result fits in 117 * a daddr_t. 118 */ 119#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 120 (sizeof (bytes) > sizeof(long) \ 121 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 122 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 123 124#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 125 ((off_t)(db) << DEV_BSHIFT) 126 127/* 128 * Mach derived conversion macros 129 */ 130#define trunc_page(x) ((unsigned)(x) & ~PAGE_MASK) 131#define round_page(x) ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK) 132#define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK) 133#define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK) 134 135#define atop(x) ((unsigned)(x) >> PAGE_SHIFT) 136#define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) 137 138#define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT) 139#define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT) 140 141#endif /* !LOCORE */ 142 143#endif /* !_MACHINE_PARAM_H_ */ 144