1 /* $NetBSD: param.h,v 1.50 2002/04/21 21:00:29 ragge Exp $ */ 2 /*- 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)param.h 5.8 (Berkeley) 6/28/91 38 */ 39 40 #ifndef _VAX_PARAM_H_ 41 #define _VAX_PARAM_H_ 42 43 /* 44 * Machine dependent constants for VAX. 45 */ 46 47 #define _MACHINE vax 48 #define MACHINE "vax" 49 #define _MACHINE_ARCH vax 50 #define MACHINE_ARCH "vax" 51 #define MID_MACHINE MID_VAX 52 53 /* 54 * Round p (pointer or byte index) up to a correctly-aligned value 55 * for all data types (int, long, ...). The result is u_int and 56 * must be cast to any desired pointer type. 57 * 58 * ALIGNED_POINTER is a boolean macro that checks whether an address 59 * is valid to fetch data elements of type t from on this architecture. 60 * This does not reflect the optimal alignment, just the possibility 61 * (within reasonable limits). 62 * 63 */ 64 65 #define ALIGNBYTES (sizeof(int) - 1) 66 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 67 #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 68 69 #define PGSHIFT 12 /* LOG2(NBPG) */ 70 #define NBPG (1 << PGSHIFT) /* (1 << PGSHIFT) bytes/page */ 71 #define PGOFSET (NBPG - 1) /* byte offset into page */ 72 73 #define VAX_PGSHIFT 9 74 #define VAX_NBPG (1 << VAX_PGSHIFT) 75 #define VAX_PGOFSET (VAX_NBPG - 1) 76 #define VAX_NPTEPG (VAX_NBPG / 4) 77 78 #define KERNBASE 0x80000000 /* start of kernel virtual */ 79 80 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 81 #define DEV_BSIZE (1 << DEV_BSHIFT) 82 83 #define BLKDEV_IOSIZE 2048 84 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 85 #define MAXBSIZE 0x4000 /* max FS block size - XXX */ 86 87 #define UPAGES 2 /* pages of u-area */ 88 #define USPACE (NBPG*UPAGES) 89 #define REDZONEADDR (VAX_NBPG*3) /* Must be > sizeof(struct user) */ 90 91 #ifndef MSGBUFSIZE 92 #define MSGBUFSIZE NBPG /* default message buffer size */ 93 #endif 94 95 /* 96 * KVA is very tight on vax, reduce the amount of KVA used by pipe 97 * "direct" write code to reasonably low value. 98 */ 99 #ifndef PIPE_DIRECT_CHUNK 100 #define PIPE_DIRECT_CHUNK 65536 101 #endif 102 103 /* 104 * Constants related to network buffer management. 105 * MCLBYTES must be no larger than NBPG (the software page size), and, 106 * on machines that exchange pages of input or output buffers with mbuf 107 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 108 * of the hardware page size. 109 */ 110 #define MSIZE 256 /* size of an mbuf */ 111 112 #ifndef MCLSHIFT 113 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 114 /* 2K cluster can hold Ether frame */ 115 #endif /* MCLSHIFT */ 116 117 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 118 119 #ifndef NMBCLUSTERS 120 #if defined(_KERNEL_OPT) 121 #include "opt_gateway.h" 122 #endif 123 124 #ifdef GATEWAY 125 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 126 #else 127 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 128 #endif 129 #endif 130 131 /* 132 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 133 * logical pages. 134 */ 135 #define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT) 136 #define NKMEMPAGES_MAX_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT) 137 138 /* 139 * Some macros for units conversion 140 */ 141 142 /* pages ("clicks") to disk blocks */ 143 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 144 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 145 146 /* clicks to bytes */ 147 #define ctob(x) ((x) << PGSHIFT) 148 #define btoc(x) (((unsigned)(x) + PGOFSET) >> PGSHIFT) 149 #define btop(x) (((unsigned)(x)) >> PGSHIFT) 150 151 /* bytes to disk blocks */ 152 #define btodb(x) ((unsigned long)(x) >> DEV_BSHIFT) 153 #define dbtob(x) ((unsigned long)(x) << DEV_BSHIFT) 154 155 /* MD conversion macros */ 156 #define vax_btoc(x) (((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT) 157 #define vax_btop(x) (((unsigned)(x)) >> VAX_PGSHIFT) 158 159 /* 160 * Map a ``block device block'' to a file system block. 161 * This should be device dependent, and will be if we 162 * add an entry to cdevsw/bdevsw for that purpose. 163 * For now though just use DEV_BSIZE. 164 */ 165 166 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 167 168 #ifdef _KERNEL 169 #include <machine/intr.h> 170 171 /* Prototype needed for delay() */ 172 #ifndef _LOCORE 173 void delay __P((int)); 174 /* inline macros used inside kernel */ 175 #include <machine/macros.h> 176 #endif 177 178 #define DELAY(x) delay(x) 179 #endif /* _KERNEL */ 180 181 #endif /* _VAX_PARAM_H_ */ 182