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 * $Id$ 37 */ 38 39 /* 40 * Machine dependent constants for Intel 386. 41 */ 42 43 #define MACHINE "i386" 44 45 /* 46 * Round p (pointer or byte index) up to a correctly-aligned value 47 * for all data types (int, long, ...). The result is u_int and 48 * must be cast to any desired pointer type. 49 */ 50 #define ALIGNBYTES (sizeof(int) - 1) 51 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 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 #ifndef KERNBASE 63 #define KERNBASE 0xFE000000UL /* start of kernel virtual */ 64 #endif 65 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 66 #define ENDUSERMEM (KERNBASE - NBPDR) 67 68 #define DEV_BSIZE 512 69 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 70 #define BLKDEV_IOSIZE 2048 71 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 72 73 #define CLSIZE 1 74 #define CLSIZELOG2 0 75 76 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 77 #define SSIZE 1 /* initial stack size/NBPG */ 78 #define SINCR 1 /* increment of stack/NBPG */ 79 80 #define UPAGES 2 /* pages of u-area */ 81 82 /* 83 * Constants related to network buffer management. 84 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 85 * on machines that exchange pages of input or output buffers with mbuf 86 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 87 * of the hardware page size. 88 */ 89 #define MSIZE 128 /* size of an mbuf */ 90 #define MCLBYTES 2048 /* contains a full ethernet packet */ 91 #define MCLSHIFT 10 92 #define MCLOFSET (MCLBYTES - 1) 93 #ifndef NMBCLUSTERS 94 #ifdef GATEWAY 95 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 96 #else 97 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 98 #endif 99 #endif 100 101 /* 102 * Size of kernel malloc arena in CLBYTES-sized logical pages 103 */ 104 #ifndef NKMEMCLUSTERS 105 #define NKMEMCLUSTERS (4096*1024/CLBYTES) 106 #endif 107 /* 108 * Some macros for units conversion 109 */ 110 /* Core clicks (4096 bytes) to segments and vice versa */ 111 #define ctos(x) (x) 112 #define stoc(x) (x) 113 114 /* Core clicks (4096 bytes) to disk blocks */ 115 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 116 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 117 #define dtob(x) ((x)<<DEV_BSHIFT) 118 119 /* clicks to bytes */ 120 #define ctob(x) ((x)<<PGSHIFT) 121 122 /* bytes to clicks */ 123 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 124 125 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 126 ((unsigned)(bytes) >> DEV_BSHIFT) 127 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 128 ((unsigned)(db) << DEV_BSHIFT) 129 130 /* 131 * Map a ``block device block'' to a file system block. 132 * This should be device dependent, and will be if we 133 * add an entry to cdevsw/bdevsw for that purpose. 134 * For now though just use DEV_BSIZE. 135 */ 136 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 137 138 /* 139 * Mach derived conversion macros 140 */ 141 #define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 142 #define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 143 #define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 144 #define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 145 #define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 146 #define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 147 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 148 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 149 150 #ifndef KERNEL 151 #define DELAY(n) { volatile int cnt = (n); while (--cnt > 0); } 152 #else 153 #define DELAY(n) ({ \ 154 extern int loops_per_usec; \ 155 volatile int cnt = loops_per_usec * (n); \ 156 \ 157 while (--cnt > 0) \ 158 ; \ 159 }) 160 #endif 161