param.h revision 1.56
1 /* $NetBSD: param.h,v 1.56 2008/07/02 17:28:57 ad 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. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)param.h 5.8 (Berkeley) 6/28/91 34 */ 35 36 #ifndef _VAX_PARAM_H_ 37 #define _VAX_PARAM_H_ 38 39 /* 40 * Machine dependent constants for VAX. 41 */ 42 43 #define _MACHINE vax 44 #define MACHINE "vax" 45 #define _MACHINE_ARCH vax 46 #define MACHINE_ARCH "vax" 47 #define MID_MACHINE MID_VAX 48 49 /* 50 * Round p (pointer or byte index) up to a correctly-aligned value 51 * for all data types (int, long, ...). The result is u_int and 52 * must be cast to any desired pointer type. 53 * 54 * ALIGNED_POINTER is a boolean macro that checks whether an address 55 * is valid to fetch data elements of type t from on this architecture. 56 * This does not reflect the optimal alignment, just the possibility 57 * (within reasonable limits). 58 * 59 */ 60 61 #define ALIGNBYTES (sizeof(int) - 1) 62 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 63 #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 64 65 #define PGSHIFT 12 /* LOG2(NBPG) */ 66 #define NBPG (1 << PGSHIFT) /* (1 << PGSHIFT) bytes/page */ 67 #define PGOFSET (NBPG - 1) /* byte offset into page */ 68 69 #define VAX_PGSHIFT 9 70 #define VAX_NBPG (1 << VAX_PGSHIFT) 71 #define VAX_PGOFSET (VAX_NBPG - 1) 72 #define VAX_NPTEPG (VAX_NBPG / 4) 73 74 #define KERNBASE 0x80000000 /* start of kernel virtual */ 75 76 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 77 #define DEV_BSIZE (1 << DEV_BSHIFT) 78 79 #define BLKDEV_IOSIZE 2048 80 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 81 #define MAXBSIZE 0x4000 /* max FS block size - XXX */ 82 83 #define UPAGES 2 /* pages of u-area */ 84 #define USPACE (NBPG*UPAGES) 85 #define REDZONEADDR (VAX_NBPG*3) /* Must be > sizeof(struct user) */ 86 87 #ifndef MSGBUFSIZE 88 #define MSGBUFSIZE NBPG /* default message buffer size */ 89 #endif 90 91 /* 92 * KVA is very tight on vax, reduce the amount of KVA used by pipe 93 * "direct" write code to reasonably low value. 94 */ 95 #ifndef PIPE_DIRECT_CHUNK 96 #define PIPE_DIRECT_CHUNK 65536 97 #endif 98 99 /* 100 * Constants related to network buffer management. 101 * MCLBYTES must be no larger than NBPG (the software page size), and, 102 * on machines that exchange pages of input or output buffers with mbuf 103 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 104 * of the hardware page size. 105 */ 106 #define MSIZE 256 /* size of an mbuf */ 107 108 #ifndef MCLSHIFT 109 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 110 /* 2K cluster can hold Ether frame */ 111 #endif /* MCLSHIFT */ 112 113 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 114 115 #ifndef NMBCLUSTERS 116 #if defined(_KERNEL_OPT) 117 #include "opt_gateway.h" 118 #endif 119 120 #ifdef GATEWAY 121 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 122 #else 123 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 124 #endif 125 #endif 126 127 /* 128 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 129 * logical pages. 130 */ 131 #define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT) 132 #define NKMEMPAGES_MAX_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT) 133 134 /* 135 * Some macros for units conversion 136 */ 137 138 #define btop(x) ((x) >> PGSHIFT) 139 140 /* MD conversion macros */ 141 #define vax_btoc(x) (((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT) 142 #define vax_btop(x) (((unsigned)(x)) >> VAX_PGSHIFT) 143 144 #ifdef _KERNEL 145 #include <machine/intr.h> 146 147 /* Prototype needed for delay() */ 148 #ifndef _LOCORE 149 void delay(int); 150 /* inline macros used inside kernel */ 151 #include <machine/macros.h> 152 #endif 153 154 #define DELAY(x) delay(x) 155 #define MAXEXEC 1 156 #endif /* _KERNEL */ 157 158 #endif /* _VAX_PARAM_H_ */ 159
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