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 * @(#)param.h 5.8 (Berkeley) 6/28/91 37 * 38 * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE 39 * -------------------- ----- ---------------------- 40 * CURRENT PATCH LEVEL: 2 00166 41 * -------------------- ----- ---------------------- 42 * 43 * 08 Apr 93 Andrew Herbert Fixes for kmem_alloc panics 44 * Rodney W. Grimes Tuneable mbuf sizes 45 * 04 Jun 93 Rodney W. Grimes Change default mbuf size to 2048 via 46 * MCLSHIFT. 47 */ 48 49 /* 50 * Machine dependent constants for Intel 386. 51 */ 52 53 #define MACHINE "i386" 54 55 /* 56 * Round p (pointer or byte index) up to a correctly-aligned value 57 * for all data types (int, long, ...). The result is u_int and 58 * must be cast to any desired pointer type. 59 */ 60 #define ALIGNBYTES (sizeof(int) - 1) 61 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 62 63 64 #define NBPG 4096 /* bytes/page */ 65 #define PGOFSET (NBPG-1) /* byte offset into page */ 66 #define PGSHIFT 12 /* LOG2(NBPG) */ 67 #define NPTEPG (NBPG/(sizeof (struct pte))) 68 69 #define NBPDR (1024*NBPG) /* bytes/page dir */ 70 #define PDROFSET (NBPDR-1) /* byte offset into page dir */ 71 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 72 73 #define KERNBASE 0xFE000000 /* start of kernel virtual */ 74 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 75 76 #define DEV_BSIZE 512 77 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 78 #define BLKDEV_IOSIZE 2048 79 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 80 81 #define CLSIZE 1 82 #define CLSIZELOG2 0 83 84 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 85 #define SSIZE 1 /* initial stack size/NBPG */ 86 #define SINCR 1 /* increment of stack/NBPG */ 87 88 #define UPAGES 2 /* pages of u-area */ 89 90 /* 91 * Constants related to network buffer management. 92 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 93 * on machines that exchange pages of input or output buffers with mbuf 94 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 95 * of the hardware page size. 96 */ 97 #ifndef MSIZE 98 #define MSIZE 128 /* size of an mbuf */ 99 #endif /* MSIZE */ 100 101 #ifndef MCLSHIFT 102 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 103 #endif /* MCLSHIFT */ 104 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 105 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 106 107 #ifndef NMBCLUSTERS 108 #ifdef GATEWAY 109 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 110 #else 111 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 112 #endif /* GATEWAY */ 113 #endif /* NMBCLUSTERS */ 114 115 /* 116 * Size of kernel malloc arena in CLBYTES-sized logical pages 117 */ 118 #ifndef NKMEMCLUSTERS 119 #define NKMEMCLUSTERS (3072*1024/CLBYTES) 120 #endif 121 /* 122 * Some macros for units conversion 123 */ 124 /* Core clicks (4096 bytes) to segments and vice versa */ 125 #define ctos(x) (x) 126 #define stoc(x) (x) 127 128 /* Core clicks (4096 bytes) to disk blocks */ 129 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 130 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 131 #define dtob(x) ((x)<<DEV_BSHIFT) 132 133 /* clicks to bytes */ 134 #define ctob(x) ((x)<<PGSHIFT) 135 136 /* bytes to clicks */ 137 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 138 139 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 140 ((unsigned)(bytes) >> DEV_BSHIFT) 141 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 142 ((unsigned)(db) << DEV_BSHIFT) 143 144 /* 145 * Map a ``block device block'' to a file system block. 146 * This should be device dependent, and will be if we 147 * add an entry to cdevsw/bdevsw for that purpose. 148 * For now though just use DEV_BSIZE. 149 */ 150 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 151 152 /* 153 * Mach derived conversion macros 154 */ 155 #define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 156 #define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 157 #define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 158 #define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 159 #define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 160 #define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 161 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 162 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 163 164 #ifndef KERNEL 165 #define DELAY(n) { volatile int N = (n); while (--N > 0); } 166 #endif 167