param.h revision 584
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 1.4 1993/10/08 13:01:34 rgrimes Exp $ 38 */ 39 40/* 41 * Machine dependent constants for Intel 386. 42 */ 43 44#define MACHINE "i386" 45#define MID_MACHINE MID_I386 46 47/* 48 * Round p (pointer or byte index) up to a correctly-aligned value 49 * for all data types (int, long, ...). The result is u_int and 50 * must be cast to any desired pointer type. 51 */ 52#define ALIGNBYTES (sizeof(int) - 1) 53#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 54 55#define PGSHIFT 12 /* LOG2(NBPG) */ 56#define NBPG (1 << PGSHIFT) /* bytes/page */ 57#define PGOFSET (NBPG-1) /* byte offset into page */ 58#define NPTEPG (NBPG/(sizeof (struct pte))) 59 60#define PDRSHIFT 22 /* LOG2(NBPDR) */ 61#define NBPDR (1 << PDRSHIFT) /* bytes/page dir */ 62#define PDROFSET (NBPDR-1) /* byte offset into page dir */ 63 64#define KERNBASE 0xFE000000 /* start of kernel virtual */ 65#define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 66 67#define KERNSIZE 0x00C00000 /* size of kernel virtual */ 68 69#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 70#define DEV_BSIZE (1 << DEV_BSHIFT) 71 72#define BLKDEV_IOSIZE 2048 73#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 74 75#define CLSIZELOG2 0 76#define CLSIZE (1 << CLSIZELOG2) 77 78/* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 79#define SSIZE 1 /* initial stack size/NBPG */ 80#define SINCR 1 /* increment of stack/NBPG */ 81 82#define UPAGES 2 /* pages of u-area */ 83 84/* 85 * Constants related to network buffer management. 86 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 87 * on machines that exchange pages of input or output buffers with mbuf 88 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 89 * of the hardware page size. 90 */ 91#ifndef MSIZE 92#define MSIZE 128 /* size of an mbuf */ 93#endif /* MSIZE */ 94 95#ifndef MCLSHIFT 96#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 97#endif /* MCLSHIFT */ 98#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 99#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 100 101#ifndef NMBCLUSTERS 102#ifdef GATEWAY 103#define NMBCLUSTERS 512 /* map size, max cluster allocation */ 104#else 105#define NMBCLUSTERS 256 /* map size, max cluster allocation */ 106#endif /* GATEWAY */ 107#endif /* NMBCLUSTERS */ 108 109/* 110 * Size of kernel malloc arena in CLBYTES-sized logical pages 111 */ 112#ifndef NKMEMCLUSTERS 113#define NKMEMCLUSTERS (3072*1024/CLBYTES) 114#endif 115/* 116 * Some macros for units conversion 117 */ 118/* Core clicks (4096 bytes) to segments and vice versa */ 119#define ctos(x) (x) 120#define stoc(x) (x) 121 122/* Core clicks (4096 bytes) to disk blocks */ 123#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 124#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 125#define dtob(x) ((x)<<DEV_BSHIFT) 126 127/* clicks to bytes */ 128#define ctob(x) ((x)<<PGSHIFT) 129 130/* bytes to clicks */ 131#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 132 133#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 134 ((unsigned)(bytes) >> DEV_BSHIFT) 135#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 136 ((unsigned)(db) << DEV_BSHIFT) 137 138/* 139 * Map a ``block device block'' to a file system block. 140 * This should be device dependent, and will be if we 141 * add an entry to cdevsw/bdevsw for that purpose. 142 * For now though just use DEV_BSIZE. 143 */ 144#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 145 146/* 147 * Mach derived conversion macros 148 */ 149#define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 150#define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 151#define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 152#define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 153#define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 154#define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 155#define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 156#define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 157 158/* 159 * phystokv stolen from SCSI device drivers and fixed to use KERNBASE 160 */ 161#define PHYSTOKV(x) (x + KERNBASE) 162