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 1.5 1993/06/05 23:11:10 cgd Exp $ 38 */ 39 40 /* 41 * Machine dependent constants for Intel 386. 42 */ 43 44 #define MACHINE "i386" 45 46 /* 47 * Round p (pointer or byte index) up to a correctly-aligned value 48 * for all data types (int, long, ...). The result is u_int and 49 * must be cast to any desired pointer type. 50 */ 51 #define ALIGN(p) (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1)) 52 53 #define NBPG 4096 /* bytes/page */ 54 #define PGOFSET (NBPG-1) /* byte offset into page */ 55 #define PGSHIFT 12 /* LOG2(NBPG) */ 56 #define NPTEPG (NBPG/(sizeof (struct pte))) 57 58 #define NBPDR (1024*NBPG) /* bytes/page dir */ 59 #define PDROFSET (NBPDR-1) /* byte offset into page dir */ 60 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 61 62 #define KERNBASE 0xFE000000 /* start of kernel virtual */ 63 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 64 65 #define DEV_BSIZE 512 66 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 67 #define BLKDEV_IOSIZE 2048 68 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 69 70 #define CLSIZE 1 71 #define CLSIZELOG2 0 72 73 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 74 #define SSIZE 1 /* initial stack size/NBPG */ 75 #define SINCR 1 /* increment of stack/NBPG */ 76 77 #define UPAGES 2 /* pages of u-area */ 78 79 /* 80 * Constants related to network buffer management. 81 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 82 * on machines that exchange pages of input or output buffers with mbuf 83 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 84 * of the hardware page size. 85 */ 86 #ifndef MSIZE 87 #define MSIZE 128 /* size of an mbuf */ 88 #endif 89 #ifndef MCLSHIFT 90 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 91 #endif 92 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 93 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 94 #ifndef NMBCLUSTERS 95 #ifdef GATEWAY 96 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 97 #else 98 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 99 #endif 100 #endif 101 102 /* 103 * Size of kernel malloc arena in CLBYTES-sized logical pages 104 */ 105 #ifndef NKMEMCLUSTERS 106 #define NKMEMCLUSTERS (3072*1024/CLBYTES) 107 #endif 108 /* 109 * Some macros for units conversion 110 */ 111 /* Core clicks (4096 bytes) to segments and vice versa */ 112 #define ctos(x) (x) 113 #define stoc(x) (x) 114 115 /* Core clicks (4096 bytes) to disk blocks */ 116 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 117 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 118 #define dtob(x) ((x)<<DEV_BSHIFT) 119 120 /* clicks to bytes */ 121 #define ctob(x) ((x)<<PGSHIFT) 122 123 /* bytes to clicks */ 124 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 125 126 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 127 ((unsigned)(bytes) >> DEV_BSHIFT) 128 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 129 ((unsigned)(db) << DEV_BSHIFT) 130 131 /* 132 * Map a ``block device block'' to a file system block. 133 * This should be device dependent, and will be if we 134 * add an entry to cdevsw/bdevsw for that purpose. 135 * For now though just use DEV_BSIZE. 136 */ 137 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 138 139 /* 140 * Mach derived conversion macros 141 */ 142 #define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 143 #define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 144 #define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 145 #define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 146 #define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 147 #define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 148 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 149 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 150 151 #ifndef KERNEL 152 #define DELAY(n) { volatile int N = (n); while (--N > 0); } 153 #endif 154