param.h revision 1.69
1 /* $NetBSD: param.h,v 1.69 2008/12/20 13:06:25 ad 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 #include <machine/cpu.h> 46 #endif 47 48 #define _MACHINE i386 49 #define MACHINE "i386" 50 #define _MACHINE_ARCH i386 51 #define MACHINE_ARCH "i386" 52 #define MID_MACHINE MID_I386 53 54 /* 55 * Round p (pointer or byte index) up to a correctly-aligned value 56 * for all data types (int, long, ...). The result is u_int and 57 * must be cast to any desired pointer type. 58 * 59 * ALIGNED_POINTER is a boolean macro that checks whether an address 60 * is valid to fetch data elements of type t from on this architecture. 61 * This does not reflect the optimal alignment, just the possibility 62 * (within reasonable limits). 63 * 64 */ 65 #define ALIGNBYTES (sizeof(int) - 1) 66 #define ALIGN(p) (((u_int)(u_long)(p) + ALIGNBYTES) &~ \ 67 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 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 74 75 #ifdef KERNBASE_LOCORE 76 #error "You should only re-define KERNBASE" 77 #endif 78 79 #ifndef KERNBASE 80 #define KERNBASE 0xc0000000UL /* start of kernel virtual space */ 81 #endif 82 83 #define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */ 84 #define BTOPKERNBASE (KERNBASE >> PGSHIFT) 85 86 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 87 #define DEV_BSIZE (1 << DEV_BSHIFT) 88 #define BLKDEV_IOSIZE 2048 89 #ifndef MAXPHYS 90 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 91 #endif 92 93 #define SSIZE 1 /* initial stack size/NBPG */ 94 #define SINCR 1 /* increment of stack/NBPG */ 95 96 #ifndef UPAGES 97 # ifdef DIAGNOSTIC 98 # define UPAGES 3 /* 2 + 1 page for redzone */ 99 # else 100 # define UPAGES 2 /* normal pages of u-area */ 101 # endif /* DIAGNOSTIC */ 102 #endif /* !defined(UPAGES) */ 103 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 104 #define INTRSTACKSIZE 8192 105 106 #ifndef MSGBUFSIZE 107 #define MSGBUFSIZE 8*NBPG /* default message buffer size */ 108 #endif 109 110 /* 111 * Constants related to network buffer management. 112 * MCLBYTES must be no larger than NBPG (the software page size), and, 113 * on machines that exchange pages of input or output buffers with mbuf 114 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 115 * of the hardware page size. 116 */ 117 #define MSIZE 256 /* size of an mbuf */ 118 119 #ifndef MCLSHIFT 120 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 121 /* 2K cluster can hold Ether frame */ 122 #endif /* MCLSHIFT */ 123 124 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 125 126 #ifndef NMBCLUSTERS 127 #if defined(_KERNEL_OPT) 128 #include "opt_gateway.h" 129 #endif 130 131 #ifdef GATEWAY 132 #define NMBCLUSTERS 2048 /* map size, max cluster allocation */ 133 #else 134 #define NMBCLUSTERS 1024 /* map size, max cluster allocation */ 135 #endif 136 #endif 137 138 #ifndef NFS_RSIZE 139 #define NFS_RSIZE 32768 140 #endif 141 #ifndef NFS_WSIZE 142 #define NFS_WSIZE 32768 143 #endif 144 145 /* 146 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 147 * logical pages. 148 */ 149 #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT) 150 #define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT) 151 152 /* 153 * Mach derived conversion macros 154 */ 155 #define x86_round_pdr(x) \ 156 ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1)) 157 #define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1)) 158 #define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT) 159 #define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT) 160 #define x86_round_page(x) ((((unsigned long)(x)) + PGOFSET) & ~PGOFSET) 161 #define x86_trunc_page(x) ((unsigned long)(x) & ~PGOFSET) 162 #define x86_btop(x) ((unsigned long)(x) >> PGSHIFT) 163 #define x86_ptob(x) ((unsigned long)(x) << PGSHIFT) 164 165 #endif /* _I386_PARAM_H_ */ 166
Indexes created Mon Oct 20 16:09:52 GMT 2025