1 /* $OpenBSD: param.h,v 1.24 2003/06/02 23:27:47 millert Exp $ */ 2 /* $NetBSD: param.h,v 1.29 1996/03/04 05:04:26 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)param.h 5.8 (Berkeley) 6/28/91 36 */ 37 38 /* 39 * Machine dependent constants for Intel 386. 40 */ 41 42 #ifdef _KERNEL 43 #ifdef _LOCORE 44 #include <machine/psl.h> 45 #else 46 #include <machine/cpu.h> 47 #endif 48 #endif 49 50 #define _MACHINE i386 51 #define MACHINE "i386" 52 #define _MACHINE_ARCH i386 53 #define MACHINE_ARCH "i386" 54 #define MID_MACHINE MID_I386 55 56 /* 57 * Round p (pointer or byte index) up to a correctly-aligned value 58 * for all data types (int, long, ...). The result is u_int and 59 * must be cast to any desired pointer type. 60 * 61 * ALIGNED_POINTER is a boolean macro that checks whether an address 62 * is valid to fetch data elements of type t from on this architecture. 63 * This does not reflect the optimal alignment, just the possibility 64 * (within reasonable limits). 65 */ 66 #define ALIGNBYTES (sizeof(int) - 1) 67 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 68 #define ALIGNED_POINTER(p,t) 1 69 70 #define PGSHIFT 12 /* LOG2(NBPG) */ 71 #define NBPG (1 << PGSHIFT) /* bytes/page */ 72 #define PGOFSET (NBPG-1) /* byte offset into page */ 73 74 #define PAGE_SHIFT 12 75 #define PAGE_SIZE (1 << PAGE_SHIFT) 76 #define PAGE_MASK (PAGE_SIZE - 1) 77 78 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 79 80 /* 81 * Start of kernel virtual space. Remember to alter the memory and 82 * page table layout description in pmap.h when changing this. 83 */ 84 #define KERNBASE 0xd0000000 85 86 #define KERNTEXTOFF (KERNBASE+0x100000) /* start of kernel text */ 87 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 88 89 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 90 #define DEV_BSIZE (1 << DEV_BSHIFT) 91 #define BLKDEV_IOSIZE 2048 92 #ifndef MAXPHYS 93 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 94 #endif 95 96 #define SSIZE 1 /* initial stack size/NBPG */ 97 #define SINCR 1 /* increment of stack/NBPG */ 98 #define UPAGES 2 /* pages of u-area */ 99 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 100 101 #ifndef MSGBUFSIZE 102 #define MSGBUFSIZE 2*NBPG /* default message buffer size */ 103 #endif 104 105 /* 106 * Constants related to network buffer management. 107 * MCLBYTES must be no larger than the software page size, and, 108 * on machines that exchange pages of input or output buffers with mbuf 109 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 110 * of the hardware page size. 111 */ 112 #define MSIZE 256 /* size of an mbuf */ 113 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 114 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 115 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 116 117 #ifndef NMBCLUSTERS 118 #define NMBCLUSTERS 2048 /* map size, max cluster allocation */ 119 #endif 120 121 /* 122 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 123 * logical pages. 124 */ 125 #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT) 126 #define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT) 127 128 /* pages ("clicks") to disk blocks */ 129 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 130 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 131 132 /* bytes to pages */ 133 #define ctob(x) ((x) << PGSHIFT) 134 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 135 136 /* bytes to disk blocks */ 137 #define dbtob(x) ((x) << DEV_BSHIFT) 138 #define btodb(x) ((x) >> DEV_BSHIFT) 139 140 /* 141 * Map a ``block device block'' to a file system block. 142 * This should be device dependent, and should use the bsize 143 * field from the disk label. 144 * For now though just use DEV_BSIZE. 145 */ 146 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 147 148 /* 149 * Mach derived conversion macros 150 */ 151 #define i386_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 152 #define i386_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 153 #define i386_btod(x) ((unsigned)(x) >> PDSHIFT) 154 #define i386_dtob(x) ((unsigned)(x) << PDSHIFT) 155 #define i386_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 156 #define i386_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 157 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 158 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 159