param.h revision 1.89
1 /* $NetBSD: param.h,v 1.89 2025/04/20 22:33:13 riastradh 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 /* 69 * Stack alignment is 4-byte, following the traditional i386 SysV ABI 70 * published by SCO. Note: Parts of the Linux world have altered the 71 * ABI to guarantee 16-byte alignment, which is convenient for SSE2, 72 * but an incompatible ABI change which we do not follow. 73 */ 74 #define STACK_ALIGNBYTES (4 - 1) 75 76 #define PGSHIFT 12 /* LOG2(NBPG) */ 77 #define NBPG (1 << PGSHIFT) /* bytes/page */ 78 #define PGOFSET (NBPG-1) /* byte offset into page */ 79 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 80 81 #define MAXIOMEM 0xffffffff 82 83 /* 84 * Maximum physical memory supported by the implementation. 85 */ 86 #ifdef PAE 87 #define MAXPHYSMEM 0x1000000000ULL /* 64GB */ 88 #else 89 #define MAXPHYSMEM 0x100000000ULL /* 4GB */ 90 #endif 91 92 #if defined(_KERNEL_OPT) 93 #include "opt_kernbase.h" 94 #endif /* defined(_KERNEL_OPT) */ 95 96 #ifndef KERNBASE 97 #define KERNBASE 0xc0000000UL /* start of kernel virtual space */ 98 #endif 99 100 #define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */ 101 #define BTOPKERNBASE (KERNBASE >> PGSHIFT) 102 103 #define SSIZE 1 /* initial stack size/NBPG */ 104 #define SINCR 1 /* increment of stack/NBPG */ 105 106 #ifndef UPAGES 107 # ifdef DIAGNOSTIC 108 # define UPAGES 3 /* 2 + 1 page for redzone */ 109 # else 110 # define UPAGES 2 /* normal pages of u-area */ 111 # endif /* DIAGNOSTIC */ 112 #endif /* !defined(UPAGES) */ 113 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 114 #define INTRSTACKSIZE 8192 115 116 #ifndef MSGBUFSIZE 117 #define MSGBUFSIZE (16*NBPG) /* default message buffer size */ 118 #endif 119 120 /* 121 * Constants related to network buffer management. 122 * MCLBYTES must be no larger than NBPG (the software page size), and, 123 * on machines that exchange pages of input or output buffers with mbuf 124 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 125 * of the hardware page size. 126 */ 127 #define MSIZE 256 /* size of an mbuf */ 128 129 #ifndef MCLSHIFT 130 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 131 /* 2K cluster can hold Ether frame */ 132 #endif /* MCLSHIFT */ 133 134 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 135 136 #ifndef NMBCLUSTERS_MAX 137 #define NMBCLUSTERS_MAX (0x4000000 / MCLBYTES) /* Limit to 64MB for clusters */ 138 #endif 139 140 #ifndef NFS_RSIZE 141 #define NFS_RSIZE 32768 142 #endif 143 #ifndef NFS_WSIZE 144 #define NFS_WSIZE 32768 145 #endif 146 147 /* 148 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 149 * logical pages. 150 */ 151 #define NKMEMPAGES_MIN_DEFAULT ((16 * 1024 * 1024) >> PAGE_SHIFT) 152 #define NKMEMPAGES_MAX_DEFAULT ((360 * 1024 * 1024) >> PAGE_SHIFT) 153 154 /* 155 * Mach derived conversion macros 156 */ 157 #define x86_round_pdr(x) \ 158 ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1)) 159 #define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1)) 160 #define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT) 161 #define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT) 162 #define x86_round_page(x) ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET) 163 #define x86_trunc_page(x) ((paddr_t)(x) & ~PGOFSET) 164 #define x86_btop(x) ((paddr_t)(x) >> PGSHIFT) 165 #define x86_ptob(x) ((paddr_t)(x) << PGSHIFT) 166 167 #endif /* _I386_PARAM_H_ */ 168
Indexes created Wed Oct 01 07:09:59 GMT 2025