param.h revision 6558
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 1.17 1995/01/23 19:21:49 davidg Exp $ 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#define MID_MACHINE MID_I386 49 50/* 51 * Round p (pointer or byte index) up to a correctly-aligned value 52 * for all data types (int, long, ...). The result is unsigned int 53 * and must be cast to any desired pointer type. 54 */ 55#define ALIGNBYTES (sizeof(int) - 1) 56#define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) 57 58/* XXX PGSHIFT and PG_SHIFT are two names for the same thing */ 59#define PGSHIFT 12 /* LOG2(NBPG) */ 60#define PAGE_SHIFT 12 61#define NBPG (1 << PAGE_SHIFT) /* bytes/page */ 62#define PAGE_SIZE (1 << PAGE_SHIFT) 63#define PAGE_MASK (PAGE_SIZE-1) 64#define PGOFSET (NBPG-1) /* byte offset into page */ 65#define NPTEPG (NBPG/(sizeof (pt_entry_t))) 66 67/* XXX PDRSHIFT and PD_SHIFT are two names for the same thing */ 68#define PDRSHIFT 22 /* LOG2(NBPDR) */ 69#define NBPDR (1 << PDRSHIFT) /* bytes/page dir */ 70#define PDROFSET (NBPDR-1) /* byte offset into page dir */ 71 72/* 73 * XXX This should really be KPTDPTDI << PDRSHIFT, but since KPTDPTDI is 74 * defined in pmap.h which is included after this we can't do that 75 * (YET!) 76 */ 77#define BTOPKERNBASE (KERNBASE >> PGSHIFT) 78 79#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 80#define DEV_BSIZE (1 << DEV_BSHIFT) 81 82#define BLKDEV_IOSIZE 2048 83#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 84 85#define CLSIZELOG2 0 86#define CLSIZE (1 << CLSIZELOG2) 87 88/* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 89#define SSIZE 1 /* initial stack size/NBPG */ 90#define SINCR 1 /* increment of stack/NBPG */ 91 92#define UPAGES 2 /* pages of u-area */ 93 94/* 95 * Constants related to network buffer management. 96 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 97 * on machines that exchange pages of input or output buffers with mbuf 98 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 99 * of the hardware page size. 100 */ 101#ifndef MSIZE 102#define MSIZE 128 /* size of an mbuf */ 103#endif /* MSIZE */ 104 105#ifndef MCLSHIFT 106#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 107#endif /* MCLSHIFT */ 108#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 109#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 110 111#ifndef NMBCLUSTERS 112#ifdef GATEWAY 113#define NMBCLUSTERS 512 /* map size, max cluster allocation */ 114#else 115#define NMBCLUSTERS 256 /* map size, max cluster allocation */ 116#endif /* GATEWAY */ 117#endif /* NMBCLUSTERS */ 118 119/* 120 * Some macros for units conversion 121 */ 122/* Core clicks (4096 bytes) to segments and vice versa */ 123#define ctos(x) (x) 124#define stoc(x) (x) 125 126/* Core clicks (4096 bytes) to disk blocks */ 127#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 128#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 129#define dtob(x) ((x)<<DEV_BSHIFT) 130 131/* clicks to bytes */ 132#define ctob(x) ((x)<<PGSHIFT) 133 134/* bytes to clicks */ 135#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 136 137/* 138 * This is messy and perhaps slow because `bytes' may be an off_t. We 139 * have to shift an unsigned type to avoid sign extension and we don't 140 * want to widen `bytes' unnecessarily. Assume that off_t is long long 141 * and daddr_t is unsigned long. 142 */ 143#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 144 (sizeof (bytes) > sizeof(long) \ 145 ? (unsigned long)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 146 : (unsigned long)((unsigned long)(bytes) >> DEV_BSHIFT)) 147#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 148 ((unsigned long long)(db) << DEV_BSHIFT) 149 150/* 151 * Mach derived conversion macros 152 */ 153#define trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 154#define round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 155 156#define atop(x) ((unsigned)(x) >> PG_SHIFT) 157#define ptoa(x) ((unsigned)(x) << PG_SHIFT) 158 159#define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 160#define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 161#define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 162#define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 163#define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 164#define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 165#define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 166#define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 167 168#endif /* !_MACHINE_PARAM_H_ */ 169