param.h revision 1.81
1 /* $NetBSD: param.h,v 1.81 2017/06/14 12:27:24 maxv 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 /* 45 * MAXCPUS must be defined before cpu.h inclusion. Note: i386 might 46 * support more CPUs, but due to the limited KVA space available on 47 * i386, such support would be inefficient. Use amd64 instead. 48 */ 49 #define MAXCPUS 32 50 51 #ifdef _KERNEL 52 #include <machine/cpu.h> 53 #endif 54 55 #define _MACHINE i386 56 #define MACHINE "i386" 57 #define _MACHINE_ARCH i386 58 #define MACHINE_ARCH "i386" 59 #define MID_MACHINE MID_I386 60 61 #define ALIGNED_POINTER(p,t) 1 62 63 #define PGSHIFT 12 /* LOG2(NBPG) */ 64 #define NBPG (1 << PGSHIFT) /* bytes/page */ 65 #define PGOFSET (NBPG-1) /* byte offset into page */ 66 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 67 68 #define MAXIOMEM 0xffffffff 69 70 /* 71 * Maximum physical memory supported by the implementation. 72 */ 73 #ifdef PAE 74 #define MAXPHYSMEM 0x1000000000ULL /* 64GB */ 75 #else 76 #define MAXPHYSMEM 0x100000000ULL /* 4GB */ 77 #endif 78 79 #if defined(_KERNEL_OPT) 80 #include "opt_kernbase.h" 81 #endif /* defined(_KERNEL_OPT) */ 82 83 #ifdef KERNBASE_LOCORE 84 #error "You should only re-define KERNBASE" 85 #endif 86 87 #ifndef KERNBASE 88 #define KERNBASE 0xc0000000UL /* start of kernel virtual space */ 89 #endif 90 91 #define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */ 92 #define BTOPKERNBASE (KERNBASE >> PGSHIFT) 93 94 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 95 #define DEV_BSIZE (1 << DEV_BSHIFT) 96 #define BLKDEV_IOSIZE 2048 97 #ifndef MAXPHYS 98 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 99 #endif 100 101 #define SSIZE 1 /* initial stack size/NBPG */ 102 #define SINCR 1 /* increment of stack/NBPG */ 103 104 #ifndef UPAGES 105 # ifdef DIAGNOSTIC 106 # define UPAGES 3 /* 2 + 1 page for redzone */ 107 # else 108 # define UPAGES 2 /* normal pages of u-area */ 109 # endif /* DIAGNOSTIC */ 110 #endif /* !defined(UPAGES) */ 111 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 112 #define INTRSTACKSIZE 8192 113 114 #ifndef MSGBUFSIZE 115 #define MSGBUFSIZE (8*NBPG) /* default message buffer size */ 116 #endif 117 118 /* 119 * Constants related to network buffer management. 120 * MCLBYTES must be no larger than NBPG (the software page size), and, 121 * on machines that exchange pages of input or output buffers with mbuf 122 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 123 * of the hardware page size. 124 */ 125 #define MSIZE 256 /* size of an mbuf */ 126 127 #ifndef MCLSHIFT 128 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 129 /* 2K cluster can hold Ether frame */ 130 #endif /* MCLSHIFT */ 131 132 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 133 134 #ifndef NMBCLUSTERS_MAX 135 #define NMBCLUSTERS_MAX (0x4000000 / MCLBYTES) /* Limit to 64MB for clusters */ 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 ((16 * 1024 * 1024) >> PAGE_SHIFT) 150 #define NKMEMPAGES_MAX_DEFAULT ((360 * 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) ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET) 161 #define x86_trunc_page(x) ((paddr_t)(x) & ~PGOFSET) 162 #define x86_btop(x) ((paddr_t)(x) >> PGSHIFT) 163 #define x86_ptob(x) ((paddr_t)(x) << PGSHIFT) 164 165 #endif /* _I386_PARAM_H_ */ 166
Indexes created Wed Oct 01 07:09:59 GMT 2025