1 /* $NetBSD: param.h,v 1.60 2006/06/04 15:41:53 perry Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)param.h 5.8 (Berkeley) 6/28/91 35 */ 36 37 #ifndef _I386_PARAM_H_ 38 #define _I386_PARAM_H_ 39 40 /* 41 * Machine dependent constants for Intel 386. 42 */ 43 44 #ifdef _KERNEL 45 #ifdef _LOCORE 46 #include <machine/psl.h> 47 #else 48 #include <machine/cpu.h> 49 #endif 50 #endif 51 52 #define _MACHINE i386 53 #define MACHINE "i386" 54 #define _MACHINE_ARCH i386 55 #define MACHINE_ARCH "i386" 56 #define MID_MACHINE MID_I386 57 58 /* 59 * Round p (pointer or byte index) up to a correctly-aligned value 60 * for all data types (int, long, ...). The result is u_int and 61 * must be cast to any desired pointer type. 62 * 63 * ALIGNED_POINTER is a boolean macro that checks whether an address 64 * is valid to fetch data elements of type t from on this architecture. 65 * This does not reflect the optimal alignment, just the possibility 66 * (within reasonable limits). 67 * 68 */ 69 #define ALIGNBYTES (sizeof(int) - 1) 70 #define ALIGN(p) (((u_int)(u_long)(p) + ALIGNBYTES) &~ \ 71 ALIGNBYTES) 72 #define ALIGNED_POINTER(p,t) 1 73 74 #define PGSHIFT 12 /* LOG2(NBPG) */ 75 #define NBPG (1 << PGSHIFT) /* bytes/page */ 76 #define PGOFSET (NBPG-1) /* byte offset into page */ 77 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 78 79 #if defined(_KERNEL_OPT) 80 #include "opt_kernbase.h" 81 #endif /* defined(_KERNEL_OPT) */ 82 83 #ifdef KERNBASE_LOCORE 84 #error "You should only re-define KERNBASE" 85 #endif 86 87 #ifndef KERNBASE 88 #define KERNBASE 0xc0000000UL /* start of kernel virtual space */ 89 #endif 90 91 #define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */ 92 #define BTOPKERNBASE (KERNBASE >> PGSHIFT) 93 94 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 95 #define DEV_BSIZE (1 << DEV_BSHIFT) 96 #define BLKDEV_IOSIZE 2048 97 #ifndef MAXPHYS 98 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 99 #endif 100 101 #define SSIZE 1 /* initial stack size/NBPG */ 102 #define SINCR 1 /* increment of stack/NBPG */ 103 104 #ifdef _KERNEL_OPT 105 #include "opt_noredzone.h" 106 #endif 107 #ifndef UPAGES 108 #ifdef NOREDZONE 109 #define UPAGES 2 /* pages of u-area */ 110 #else 111 #define UPAGES 3 112 #endif /*NOREDZONE */ 113 #endif /* !defined(UPAGES) */ 114 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 115 116 #ifndef MSGBUFSIZE 117 #define MSGBUFSIZE 4*NBPG /* default message buffer size */ 118 #endif 119 120 /* 121 * Constants related to network buffer management. 122 * MCLBYTES must be no larger than NBPG (the software page size), and, 123 * on machines that exchange pages of input or output buffers with mbuf 124 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 125 * of the hardware page size. 126 */ 127 #define MSIZE 256 /* size of an mbuf */ 128 129 #ifndef MCLSHIFT 130 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 131 /* 2K cluster can hold Ether frame */ 132 #endif /* MCLSHIFT */ 133 134 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 135 136 #ifndef NMBCLUSTERS 137 #if defined(_KERNEL_OPT) 138 #include "opt_gateway.h" 139 #endif 140 141 #ifdef GATEWAY 142 #define NMBCLUSTERS 2048 /* map size, max cluster allocation */ 143 #else 144 #define NMBCLUSTERS 1024 /* map size, max cluster allocation */ 145 #endif 146 #endif 147 148 #ifndef NFS_RSIZE 149 #define NFS_RSIZE 32768 150 #endif 151 #ifndef NFS_WSIZE 152 #define NFS_WSIZE 32768 153 #endif 154 155 /* 156 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 157 * logical pages. 158 */ 159 #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT) 160 #define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT) 161 162 /* pages ("clicks") to disk blocks */ 163 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 164 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 165 166 /* bytes to pages */ 167 #define ctob(x) ((x) << PGSHIFT) 168 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 169 170 /* bytes to disk blocks */ 171 #define dbtob(x) ((x) << DEV_BSHIFT) 172 #define btodb(x) ((x) >> DEV_BSHIFT) 173 174 /* 175 * Map a ``block device block'' to a file system block. 176 * This should be device dependent, and should use the bsize 177 * field from the disk label. 178 * For now though just use DEV_BSIZE. 179 */ 180 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 181 182 /* 183 * Mach derived conversion macros 184 */ 185 #define x86_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 186 #define x86_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 187 #define x86_btod(x) ((unsigned)(x) >> PDSHIFT) 188 #define x86_dtob(x) ((unsigned)(x) << PDSHIFT) 189 #define x86_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 190 #define x86_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 191 #define x86_btop(x) ((unsigned)(x) >> PGSHIFT) 192 #define x86_ptob(x) ((unsigned)(x) << PGSHIFT) 193 194 #endif /* _I386_PARAM_H_ */ 195