1 /* $NetBSD: param.h,v 1.88 2021/05/31 14:38:55 simonb 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 #ifdef _KERNEL_OPT 41 #include "opt_param.h" 42 #endif 43 44 /* 45 * Machine dependent constants for Intel 386. 46 */ 47 48 /* 49 * MAXCPUS must be defined before cpu.h inclusion. Note: i386 might 50 * support more CPUs, but due to the limited KVA space available on 51 * i386, such support would be inefficient. Use amd64 instead. 52 */ 53 #define MAXCPUS 32 54 55 #ifdef _KERNEL 56 #include <machine/cpu.h> 57 #endif 58 59 #define _MACHINE i386 60 #define MACHINE "i386" 61 #define _MACHINE_ARCH i386 62 #define MACHINE_ARCH "i386" 63 #define MID_MACHINE MID_I386 64 65 #define ALIGNED_POINTER(p,t) 1 66 #define ALIGNED_POINTER_LOAD(q,p,t) memcpy((q), (p), sizeof(t)) 67 68 #define PGSHIFT 12 /* LOG2(NBPG) */ 69 #define NBPG (1 << PGSHIFT) /* bytes/page */ 70 #define PGOFSET (NBPG-1) /* byte offset into page */ 71 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 72 73 #define MAXIOMEM 0xffffffff 74 75 /* 76 * Maximum physical memory supported by the implementation. 77 */ 78 #ifdef PAE 79 #define MAXPHYSMEM 0x1000000000ULL /* 64GB */ 80 #else 81 #define MAXPHYSMEM 0x100000000ULL /* 4GB */ 82 #endif 83 84 #if defined(_KERNEL_OPT) 85 #include "opt_kernbase.h" 86 #endif /* defined(_KERNEL_OPT) */ 87 88 #ifndef KERNBASE 89 #define KERNBASE 0xc0000000UL /* start of kernel virtual space */ 90 #endif 91 92 #define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */ 93 #define BTOPKERNBASE (KERNBASE >> PGSHIFT) 94 95 #define SSIZE 1 /* initial stack size/NBPG */ 96 #define SINCR 1 /* increment of stack/NBPG */ 97 98 #ifndef UPAGES 99 # ifdef DIAGNOSTIC 100 # define UPAGES 3 /* 2 + 1 page for redzone */ 101 # else 102 # define UPAGES 2 /* normal pages of u-area */ 103 # endif /* DIAGNOSTIC */ 104 #endif /* !defined(UPAGES) */ 105 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 106 #define INTRSTACKSIZE 8192 107 108 #ifndef MSGBUFSIZE 109 #define MSGBUFSIZE (16*NBPG) /* default message buffer size */ 110 #endif 111 112 /* 113 * Constants related to network buffer management. 114 * MCLBYTES must be no larger than NBPG (the software page size), and, 115 * on machines that exchange pages of input or output buffers with mbuf 116 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 117 * of the hardware page size. 118 */ 119 #define MSIZE 256 /* size of an mbuf */ 120 121 #ifndef MCLSHIFT 122 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 123 /* 2K cluster can hold Ether frame */ 124 #endif /* MCLSHIFT */ 125 126 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 127 128 #ifndef NMBCLUSTERS_MAX 129 #define NMBCLUSTERS_MAX (0x4000000 / MCLBYTES) /* Limit to 64MB for clusters */ 130 #endif 131 132 #ifndef NFS_RSIZE 133 #define NFS_RSIZE 32768 134 #endif 135 #ifndef NFS_WSIZE 136 #define NFS_WSIZE 32768 137 #endif 138 139 /* 140 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 141 * logical pages. 142 */ 143 #define NKMEMPAGES_MIN_DEFAULT ((16 * 1024 * 1024) >> PAGE_SHIFT) 144 #define NKMEMPAGES_MAX_DEFAULT ((360 * 1024 * 1024) >> PAGE_SHIFT) 145 146 /* 147 * Mach derived conversion macros 148 */ 149 #define x86_round_pdr(x) \ 150 ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1)) 151 #define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1)) 152 #define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT) 153 #define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT) 154 #define x86_round_page(x) ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET) 155 #define x86_trunc_page(x) ((paddr_t)(x) & ~PGOFSET) 156 #define x86_btop(x) ((paddr_t)(x) >> PGSHIFT) 157 #define x86_ptob(x) ((paddr_t)(x) << PGSHIFT) 158 159 #endif /* _I386_PARAM_H_ */ 160