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 1.15 1994/05/25 08:56:14 rgrimes 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 12 /* 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 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 138 ((unsigned)(bytes) >> DEV_BSHIFT) 139 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 140 ((unsigned)(db) << DEV_BSHIFT) 141 142 /* 143 * Map a ``block device block'' to a file system block. 144 * This should be device dependent, and will be if we 145 * add an entry to cdevsw/bdevsw for that purpose. 146 * For now though just use DEV_BSIZE. 147 */ 148 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 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