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 1.7 1993/07/05 01:12:46 deraadt 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 ALIGN(p) (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1)) 53 54 #define NBPG 4096 /* bytes/page */ 55 #define PGOFSET (NBPG-1) /* byte offset into page */ 56 #define PGSHIFT 12 /* LOG2(NBPG) */ 57 #define NPTEPG (NBPG/(sizeof (struct pte))) 58 59 #define NBPDR (1024*NBPG) /* bytes/page dir */ 60 #define PDROFSET (NBPDR-1) /* byte offset into page dir */ 61 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 62 63 #define KERNBASE 0xFE000000 /* start of kernel virtual */ 64 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 65 66 #define DEV_BSIZE 512 67 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 68 #define BLKDEV_IOSIZE 2048 69 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 70 71 #define CLSIZE 1 72 #define CLSIZELOG2 0 73 74 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 75 #define SSIZE 1 /* initial stack size/NBPG */ 76 #define SINCR 1 /* increment of stack/NBPG */ 77 78 #define UPAGES 2 /* pages of u-area */ 79 80 /* 81 * Constants related to network buffer management. 82 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 83 * on machines that exchange pages of input or output buffers with mbuf 84 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 85 * of the hardware page size. 86 */ 87 #ifndef MSIZE 88 #define MSIZE 128 /* size of an mbuf */ 89 #endif 90 #ifndef MCLSHIFT 91 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 92 #endif 93 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 94 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 95 #ifndef NMBCLUSTERS 96 #ifdef GATEWAY 97 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 98 #else 99 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 100 #endif 101 #endif 102 103 /* 104 * Size of kernel malloc arena in CLBYTES-sized logical pages 105 */ 106 #ifndef NKMEMCLUSTERS 107 #define NKMEMCLUSTERS (3072*1024/CLBYTES) 108 #endif 109 /* 110 * Some macros for units conversion 111 */ 112 /* Core clicks (4096 bytes) to segments and vice versa */ 113 #define ctos(x) (x) 114 #define stoc(x) (x) 115 116 /* Core clicks (4096 bytes) to disk blocks */ 117 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 118 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 119 #define dtob(x) ((x)<<DEV_BSHIFT) 120 121 /* clicks to bytes */ 122 #define ctob(x) ((x)<<PGSHIFT) 123 124 /* bytes to clicks */ 125 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 126 127 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 128 ((unsigned)(bytes) >> DEV_BSHIFT) 129 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 130 ((unsigned)(db) << DEV_BSHIFT) 131 132 /* 133 * Map a ``block device block'' to a file system block. 134 * This should be device dependent, and will be if we 135 * add an entry to cdevsw/bdevsw for that purpose. 136 * For now though just use DEV_BSIZE. 137 */ 138 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 139 140 /* 141 * Mach derived conversion macros 142 */ 143 #define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 144 #define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 145 #define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 146 #define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 147 #define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 148 #define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 149 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 150 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 151