1 /* $NetBSD: param.h,v 1.40 2000/02/11 19:25:15 thorpej 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 /* 42 * Machine dependent constants for Intel 386. 43 */ 44 45 #ifdef _KERNEL 46 #ifdef _LOCORE 47 #include <machine/psl.h> 48 #else 49 #include <machine/cpu.h> 50 #endif 51 #endif 52 53 #define _MACHINE i386 54 #define MACHINE "i386" 55 #define _MACHINE_ARCH i386 56 #define MACHINE_ARCH "i386" 57 #define MID_MACHINE MID_I386 58 59 /* 60 * Round p (pointer or byte index) up to a correctly-aligned value 61 * for all data types (int, long, ...). The result is u_int and 62 * must be cast to any desired pointer type. 63 * 64 * ALIGNED_POINTER is a boolean macro that checks whether an address 65 * is valid to fetch data elements of type t from on this architecture. 66 * This does not reflect the optimal alignment, just the possibility 67 * (within reasonable limits). 68 * 69 */ 70 #define ALIGNBYTES (sizeof(int) - 1) 71 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ 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 #define KERNBASE 0xc0000000 /* start of kernel virtual space */ 80 #define KERNTEXTOFF 0xc0100000 /* start of kernel text */ 81 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 82 83 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 84 #define DEV_BSIZE (1 << DEV_BSHIFT) 85 #define BLKDEV_IOSIZE 2048 86 #ifndef MAXPHYS 87 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 88 #endif 89 90 #define SSIZE 1 /* initial stack size/NBPG */ 91 #define SINCR 1 /* increment of stack/NBPG */ 92 #define UPAGES 2 /* pages of u-area */ 93 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 94 95 #ifndef MSGBUFSIZE 96 #define MSGBUFSIZE 2*NBPG /* default message buffer size */ 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 128 /* size of an mbuf */ 107 108 #ifndef MCLSHIFT 109 # define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 110 #endif /* MCLSHIFT */ 111 112 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 113 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 114 115 #ifndef NMBCLUSTERS 116 117 #if defined(_KERNEL) && !defined(_LKM) 118 #include "opt_gateway.h" 119 #endif /* _KERNEL && ! _LKM */ 120 121 #ifdef GATEWAY 122 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 123 #else 124 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 125 #endif 126 #endif 127 128 /* 129 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 130 * logical pages. 131 */ 132 #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT) 133 #define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT) 134 135 /* pages ("clicks") to disk blocks */ 136 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 137 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 138 139 /* bytes to pages */ 140 #define ctob(x) ((x) << PGSHIFT) 141 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 142 143 /* bytes to disk blocks */ 144 #define dbtob(x) ((x) << DEV_BSHIFT) 145 #define btodb(x) ((x) >> DEV_BSHIFT) 146 147 /* 148 * Map a ``block device block'' to a file system block. 149 * This should be device dependent, and should use the bsize 150 * field from the disk label. 151 * For now though just use DEV_BSIZE. 152 */ 153 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 154 155 /* 156 * Mach derived conversion macros 157 */ 158 #define i386_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 159 #define i386_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 160 #define i386_btod(x) ((unsigned)(x) >> PDSHIFT) 161 #define i386_dtob(x) ((unsigned)(x) << PDSHIFT) 162 #define i386_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 163 #define i386_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 164 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 165 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 166