param.h revision 1.55
1 /* $NetBSD: param.h,v 1.55 2003/07/18 17:33:05 tls 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)param.h 5.8 (Berkeley) 6/28/91 39 */ 40 41 #ifndef _I386_PARAM_H_ 42 #define _I386_PARAM_H_ 43 44 /* 45 * Machine dependent constants for Intel 386. 46 */ 47 48 #ifdef _KERNEL 49 #ifdef _LOCORE 50 #include <machine/psl.h> 51 #else 52 #include <machine/cpu.h> 53 #endif 54 #endif 55 56 #define _MACHINE i386 57 #define MACHINE "i386" 58 #define _MACHINE_ARCH i386 59 #define MACHINE_ARCH "i386" 60 #define MID_MACHINE MID_I386 61 62 /* 63 * Round p (pointer or byte index) up to a correctly-aligned value 64 * for all data types (int, long, ...). The result is u_int and 65 * must be cast to any desired pointer type. 66 * 67 * ALIGNED_POINTER is a boolean macro that checks whether an address 68 * is valid to fetch data elements of type t from on this architecture. 69 * This does not reflect the optimal alignment, just the possibility 70 * (within reasonable limits). 71 * 72 */ 73 #define ALIGNBYTES (sizeof(int) - 1) 74 #define ALIGN(p) (((u_int)(u_long)(p) + ALIGNBYTES) &~ \ 75 ALIGNBYTES) 76 #define ALIGNED_POINTER(p,t) 1 77 78 #define PGSHIFT 12 /* LOG2(NBPG) */ 79 #define NBPG (1 << PGSHIFT) /* bytes/page */ 80 #define PGOFSET (NBPG-1) /* byte offset into page */ 81 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 82 83 #ifdef KERNBASE 84 #ifndef KERNBASE_LOCORE 85 #error you must define KERNBASE_LOCORE if you define KERNBASE. 86 #endif 87 #ifdef _LOCORE 88 #undef KERNBASE 89 #define KERNBASE KERNBASE_LOCORE 90 #endif /* _LOCORE */ 91 #endif /* KERNBASE */ 92 93 #ifndef KERNBASE 94 #ifndef _LOCORE 95 #define KERNBASE 0xc0000000UL /* start of kernel virtual space */ 96 #else 97 #define KERNBASE 0xc0000000 /* start of kernel virtual space */ 98 #endif /* _LOCORE */ 99 #endif /* KERNBASE */ 100 101 #define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */ 102 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 103 104 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 105 #define DEV_BSIZE (1 << DEV_BSHIFT) 106 #define BLKDEV_IOSIZE 2048 107 #ifndef MAXPHYS 108 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 109 #endif 110 111 #define SSIZE 1 /* initial stack size/NBPG */ 112 #define SINCR 1 /* increment of stack/NBPG */ 113 114 #ifdef _KERNEL_OPT 115 #include "opt_noredzone.h" 116 #endif 117 #ifdef NOREDZONE 118 #define UPAGES 2 /* pages of u-area */ 119 #else 120 #define UPAGES 4 121 #endif 122 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 123 124 #ifndef MSGBUFSIZE 125 #define MSGBUFSIZE 4*NBPG /* default message buffer size */ 126 #endif 127 128 /* 129 * Constants related to network buffer management. 130 * MCLBYTES must be no larger than NBPG (the software page size), and, 131 * on machines that exchange pages of input or output buffers with mbuf 132 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 133 * of the hardware page size. 134 */ 135 #define MSIZE 256 /* size of an mbuf */ 136 137 #ifndef MCLSHIFT 138 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 139 /* 2K cluster can hold Ether frame */ 140 #endif /* MCLSHIFT */ 141 142 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 143 144 #ifndef NMBCLUSTERS 145 #if defined(_KERNEL_OPT) 146 #include "opt_gateway.h" 147 #endif 148 149 #ifdef GATEWAY 150 #define NMBCLUSTERS 2048 /* map size, max cluster allocation */ 151 #else 152 #define NMBCLUSTERS 1024 /* map size, max cluster allocation */ 153 #endif 154 #endif 155 156 #ifndef NFS_RSIZE 157 #define NFS_RSIZE 32768 158 #endif 159 #ifndef NFS_WSIZE 160 #define NFS_WSIZE 32768 161 #endif 162 163 /* 164 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 165 * logical pages. 166 */ 167 #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT) 168 #define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT) 169 170 /* pages ("clicks") to disk blocks */ 171 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 172 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 173 174 /* bytes to pages */ 175 #define ctob(x) ((x) << PGSHIFT) 176 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 177 178 /* bytes to disk blocks */ 179 #define dbtob(x) ((x) << DEV_BSHIFT) 180 #define btodb(x) ((x) >> DEV_BSHIFT) 181 182 /* 183 * Map a ``block device block'' to a file system block. 184 * This should be device dependent, and should use the bsize 185 * field from the disk label. 186 * For now though just use DEV_BSIZE. 187 */ 188 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 189 190 /* 191 * Mach derived conversion macros 192 */ 193 #define x86_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 194 #define x86_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 195 #define x86_btod(x) ((unsigned)(x) >> PDSHIFT) 196 #define x86_dtob(x) ((unsigned)(x) << PDSHIFT) 197 #define x86_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 198 #define x86_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 199 #define x86_btop(x) ((unsigned)(x) >> PGSHIFT) 200 #define x86_ptob(x) ((unsigned)(x) << PGSHIFT) 201 202 #endif /* _I386_PARAM_H_ */ 203
Indexes created Wed Oct 01 07:09:59 GMT 2025