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 1.9 1993/10/09 01:35:50 cgd 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