1 /* $NetBSD: param.h,v 1.33 1997/10/20 00:45:04 fvdl 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 0xf0000000 /* start of kernel virtual space */ 80 #define KERNSIZE 0x01800000 /* size of kernel virtual space */ 81 #define KERNTEXTOFF 0xf0100000 /* start of kernel text */ 82 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 83 84 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 85 #define DEV_BSIZE (1 << DEV_BSHIFT) 86 #define BLKDEV_IOSIZE 2048 87 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 88 89 #define CLSIZELOG2 0 90 #define CLSIZE (1 << CLSIZELOG2) 91 92 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 93 #define SSIZE 1 /* initial stack size/NBPG */ 94 #define SINCR 1 /* increment of stack/NBPG */ 95 #define UPAGES 2 /* pages of u-area */ 96 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 97 98 #ifndef MSGBUFSIZE 99 #define MSGBUFSIZE NBPG /* default message buffer size */ 100 #endif 101 102 /* 103 * Constants related to network buffer management. 104 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 105 * on machines that exchange pages of input or output buffers with mbuf 106 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 107 * of the hardware page size. 108 */ 109 #define MSIZE 128 /* size of an mbuf */ 110 111 #ifndef MCLSHIFT 112 # define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 113 #endif /* MCLSHIFT */ 114 115 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 116 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 117 118 #ifndef NMBCLUSTERS 119 #ifdef GATEWAY 120 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 121 #else 122 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 123 #endif 124 #endif 125 126 /* 127 * Size of kernel malloc arena in CLBYTES-sized logical pages 128 */ 129 #ifndef NKMEMCLUSTERS 130 #define NKMEMCLUSTERS (6 * 1024 * 1024 / CLBYTES) 131 #endif 132 133 /* pages ("clicks") to disk blocks */ 134 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 135 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 136 137 /* bytes to pages */ 138 #define ctob(x) ((x) << PGSHIFT) 139 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 140 141 /* bytes to disk blocks */ 142 #define dbtob(x) ((x) << DEV_BSHIFT) 143 #define btodb(x) ((x) >> DEV_BSHIFT) 144 145 /* 146 * Map a ``block device block'' to a file system block. 147 * This should be device dependent, and should use the bsize 148 * field from the disk label. 149 * For now though just use DEV_BSIZE. 150 */ 151 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 152 153 /* 154 * Mach derived conversion macros 155 */ 156 #define i386_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 157 #define i386_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 158 #define i386_btod(x) ((unsigned)(x) >> PDSHIFT) 159 #define i386_dtob(x) ((unsigned)(x) << PDSHIFT) 160 #define i386_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 161 #define i386_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 162 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 163 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 164