param.h revision 5
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 ALIGN(p) (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1)) 61 62#define NBPG 4096 /* bytes/page */ 63#define PGOFSET (NBPG-1) /* byte offset into page */ 64#define PGSHIFT 12 /* LOG2(NBPG) */ 65#define NPTEPG (NBPG/(sizeof (struct pte))) 66 67#define NBPDR (1024*NBPG) /* bytes/page dir */ 68#define PDROFSET (NBPDR-1) /* byte offset into page dir */ 69#define PDRSHIFT 22 /* LOG2(NBPDR) */ 70 71#define KERNBASE 0xFE000000 /* start of kernel virtual */ 72#define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 73 74#define DEV_BSIZE 512 75#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 76#define BLKDEV_IOSIZE 2048 77#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 78 79#define CLSIZE 1 80#define CLSIZELOG2 0 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 86#define UPAGES 2 /* pages of u-area */ 87 88/* 89 * Constants related to network buffer management. 90 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 91 * on machines that exchange pages of input or output buffers with mbuf 92 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 93 * of the hardware page size. 94 */ 95#ifndef MSIZE 96#define MSIZE 128 /* size of an mbuf */ 97#endif /* MSIZE */ 98 99#ifndef MCLSHIFT 100#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 101#endif /* MCLSHIFT */ 102#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 103#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 104 105#ifndef NMBCLUSTERS 106#ifdef GATEWAY 107#define NMBCLUSTERS 512 /* map size, max cluster allocation */ 108#else 109#define NMBCLUSTERS 256 /* map size, max cluster allocation */ 110#endif /* GATEWAY */ 111#endif /* NMBCLUSTERS */ 112 113/* 114 * Size of kernel malloc arena in CLBYTES-sized logical pages 115 */ 116#ifndef NKMEMCLUSTERS 117#define NKMEMCLUSTERS (3072*1024/CLBYTES) 118#endif 119/* 120 * Some macros for units conversion 121 */ 122/* Core clicks (4096 bytes) to segments and vice versa */ 123#define ctos(x) (x) 124#define stoc(x) (x) 125 126/* Core clicks (4096 bytes) to disk blocks */ 127#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 128#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 129#define dtob(x) ((x)<<DEV_BSHIFT) 130 131/* clicks to bytes */ 132#define ctob(x) ((x)<<PGSHIFT) 133 134/* bytes to clicks */ 135#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 136 137#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 138 ((unsigned)(bytes) >> DEV_BSHIFT) 139#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 140 ((unsigned)(db) << DEV_BSHIFT) 141 142/* 143 * Map a ``block device block'' to a file system block. 144 * This should be device dependent, and will be if we 145 * add an entry to cdevsw/bdevsw for that purpose. 146 * For now though just use DEV_BSIZE. 147 */ 148#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 149 150/* 151 * Mach derived conversion macros 152 */ 153#define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 154#define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 155#define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 156#define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 157#define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 158#define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 159#define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 160#define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 161 162#ifndef KERNEL 163#define DELAY(n) { volatile int N = (n); while (--N > 0); } 164#endif 165