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 1.18 1994/04/08 04:24:16 mycroft Exp $ 38 */ 39 40 /* 41 * Machine dependent constants for Intel 386. 42 */ 43 44 #ifdef KERNEL 45 #ifdef LOCORE 46 #include <machine/psl.h> 47 #else 48 #include <machine/cpu.h> 49 #endif 50 #endif 51 52 #define MACHINE "i386" 53 #define MACHINE_ARCH "i386" 54 #define MID_MACHINE MID_I386 55 56 /* 57 * Round p (pointer or byte index) up to a correctly-aligned value 58 * for all data types (int, long, ...). The result is u_int and 59 * must be cast to any desired pointer type. 60 */ 61 #define ALIGNBYTES (sizeof(int) - 1) 62 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 63 64 #define PGSHIFT 12 /* LOG2(NBPG) */ 65 #define NBPG (1 << PGSHIFT) /* bytes/page */ 66 #define PGOFSET (NBPG-1) /* byte offset into page */ 67 #define NPTEPG (NBPG/(sizeof (struct pte))) 68 69 #define KERNBASE 0xf8000000 /* start of kernel virtual space */ 70 #define KERNSIZE 0x01800000 /* size of kernel virtual space */ 71 #define KERNTEXTOFF 0xf8100000 /* start of kernel text */ 72 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 73 74 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 75 #define DEV_BSIZE (1 << DEV_BSHIFT) 76 #define BLKDEV_IOSIZE 2048 77 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 78 79 #define CLSIZELOG2 0 80 #define CLSIZE (1 << CLSIZELOG2) 81 82 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 83 #define SSIZE 1 /* initial stack size/NBPG */ 84 #define SINCR 1 /* increment of stack/NBPG */ 85 #define UPAGES 2 /* pages of u-area */ 86 87 /* 88 * Constants related to network buffer management. 89 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 90 * on machines that exchange pages of input or output buffers with mbuf 91 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 92 * of the hardware page size. 93 */ 94 #define MSIZE 128 /* size of an mbuf */ 95 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 96 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 97 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 98 99 #ifndef NMBCLUSTERS 100 #ifdef GATEWAY 101 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 102 #else 103 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 104 #endif 105 #endif 106 107 /* 108 * Size of kernel malloc arena in CLBYTES-sized logical pages 109 */ 110 #ifndef NKMEMCLUSTERS 111 #define NKMEMCLUSTERS (6 * 1024 * 1024 / CLBYTES) 112 #endif 113 114 /* 115 * The disklabel is in block 0 or 1, possibly offset from the beginning 116 * to leave room for a bootstrap, etc. 117 */ 118 119 #define LABELSECTOR 1 /* sector containing label */ 120 #define LABELOFFSET 0 /* offset of label in sector */ 121 122 /* pages ("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 #define ctob(x) ((x) << PGSHIFT) 128 129 /* bytes to pages */ 130 #define btoc(x) (((unsigned)(x) + PGOFSET) >> PGSHIFT) 131 132 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 133 ((unsigned)(bytes) >> DEV_BSHIFT) 134 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 135 ((unsigned)(db) << DEV_BSHIFT) 136 137 /* 138 * Map a ``block device block'' to a file system block. 139 * This should be device dependent, and should use the bsize 140 * field from the disk label. 141 * For now though just use DEV_BSIZE. 142 */ 143 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 144 145 /* 146 * Mach derived conversion macros 147 */ 148 #define i386_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 149 #define i386_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 150 #define i386_btod(x) ((unsigned)(x) >> PDSHIFT) 151 #define i386_dtob(x) ((unsigned)(x) << PDSHIFT) 152 #define i386_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 153 #define i386_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 154 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 155 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 156