1 /* $NetBSD: param.h,v 1.58 2005/11/07 11:42:34 yamt 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 #ifdef NOREDZONE 108 #define UPAGES 2 /* pages of u-area */ 109 #else 110 #define UPAGES 4 111 #endif 112 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 113 114 #ifndef MSGBUFSIZE 115 #define MSGBUFSIZE 4*NBPG /* default message buffer size */ 116 #endif 117 118 /* 119 * Constants related to network buffer management. 120 * MCLBYTES must be no larger than NBPG (the software page size), and, 121 * on machines that exchange pages of input or output buffers with mbuf 122 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 123 * of the hardware page size. 124 */ 125 #define MSIZE 256 /* size of an mbuf */ 126 127 #ifndef MCLSHIFT 128 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 129 /* 2K cluster can hold Ether frame */ 130 #endif /* MCLSHIFT */ 131 132 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 133 134 #ifndef NMBCLUSTERS 135 #if defined(_KERNEL_OPT) 136 #include "opt_gateway.h" 137 #endif 138 139 #ifdef GATEWAY 140 #define NMBCLUSTERS 2048 /* map size, max cluster allocation */ 141 #else 142 #define NMBCLUSTERS 1024 /* map size, max cluster allocation */ 143 #endif 144 #endif 145 146 #ifndef NFS_RSIZE 147 #define NFS_RSIZE 32768 148 #endif 149 #ifndef NFS_WSIZE 150 #define NFS_WSIZE 32768 151 #endif 152 153 /* 154 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 155 * logical pages. 156 */ 157 #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT) 158 #define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT) 159 160 /* pages ("clicks") to disk blocks */ 161 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 162 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 163 164 /* bytes to pages */ 165 #define ctob(x) ((x) << PGSHIFT) 166 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 167 168 /* bytes to disk blocks */ 169 #define dbtob(x) ((x) << DEV_BSHIFT) 170 #define btodb(x) ((x) >> DEV_BSHIFT) 171 172 /* 173 * Map a ``block device block'' to a file system block. 174 * This should be device dependent, and should use the bsize 175 * field from the disk label. 176 * For now though just use DEV_BSIZE. 177 */ 178 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 179 180 /* 181 * Mach derived conversion macros 182 */ 183 #define x86_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 184 #define x86_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 185 #define x86_btod(x) ((unsigned)(x) >> PDSHIFT) 186 #define x86_dtob(x) ((unsigned)(x) << PDSHIFT) 187 #define x86_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 188 #define x86_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 189 #define x86_btop(x) ((unsigned)(x) >> PGSHIFT) 190 #define x86_ptob(x) ((unsigned)(x) << PGSHIFT) 191 192 #endif /* _I386_PARAM_H_ */ 193