1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * from: @(#)param.h 5.8 (Berkeley) 6/28/91 35 * $FreeBSD$ 36 */ 37 38 39 #ifndef _I386_INCLUDE_PARAM_H_ 40 #define _I386_INCLUDE_PARAM_H_ 41 42 #include <machine/_align.h> 43 44 /* 45 * Machine dependent constants for Intel 386. 46 */ 47 48 49 #define __HAVE_ACPI 50 #define __HAVE_PIR 51 #define __PCI_REROUTE_INTERRUPT 52 53 #ifndef MACHINE 54 #define MACHINE "i386" 55 #endif 56 #ifndef MACHINE_ARCH 57 #define MACHINE_ARCH "i386" 58 #endif 59 #define MID_MACHINE MID_I386 60 61 #ifdef SMP 62 #ifndef MAXCPU 63 #define MAXCPU 32 64 #endif 65 #else 66 #define MAXCPU 1 67 #endif 68 69 #ifndef MAXMEMDOM 70 #define MAXMEMDOM 1 71 #endif 72 73 #define ALIGNBYTES _ALIGNBYTES 74 #define ALIGN(p) _ALIGN(p) 75 /* 76 * ALIGNED_POINTER is a boolean macro that checks whether an address 77 * is valid to fetch data elements of type t from on this architecture. 78 * This does not reflect the optimal alignment, just the possibility 79 * (within reasonable limits). 80 */ 81 #define ALIGNED_POINTER(p, t) 1 82 83 /* 84 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an 85 * architecture. It should be used with appropriate caution. 86 */ 87 #define CACHE_LINE_SHIFT 6 88 #define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT) 89 90 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 91 #define PAGE_SIZE (1 << PAGE_SHIFT) /* bytes/page */ 92 #define PAGE_MASK (PAGE_SIZE - 1) 93 #define NPTEPG (PAGE_SIZE / sizeof(pt_entry_t)) 94 95 /* Size in bytes of the page directory */ 96 #define NBPTD (NPGPTD << PAGE_SHIFT) 97 /* Number of PDEs in page directory, 2048 for PAE, 1024 for non-PAE */ 98 #define NPDEPTD (NBPTD / sizeof(pd_entry_t)) 99 /* Number of PDEs in one page of the page directory, 512 vs. 1024 */ 100 #define NPDEPG (PAGE_SIZE / sizeof(pd_entry_t)) 101 #define PDRMASK (NBPDR - 1) 102 #ifndef PDRSHIFT 103 #define PDRSHIFT i386_pmap_PDRSHIFT 104 #endif 105 #ifndef NBPDR 106 #define NBPDR (1 << PDRSHIFT) /* bytes/page dir */ 107 #endif 108 109 #define MAXPAGESIZES 2 /* maximum number of supported page sizes */ 110 111 #define IOPAGES 2 /* pages of i/o permission bitmap */ 112 113 #ifndef KSTACK_PAGES 114 #define KSTACK_PAGES 4 /* Includes pcb! */ 115 #endif 116 #define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 117 #if KSTACK_PAGES < 4 118 #define TD0_KSTACK_PAGES 4 119 #else 120 #define TD0_KSTACK_PAGES KSTACK_PAGES 121 #endif 122 123 /* 124 * Ceiling on amount of swblock kva space, can be changed via 125 * the kern.maxswzone /boot/loader.conf variable. 126 * 127 * 276 is sizeof(struct swblock), but we do not always have a definition 128 * in scope for struct swblock, so we have to hardcode it. Each struct 129 * swblock holds metadata for 32 pages, so in theory, this is enough for 130 * 16 GB of swap. In practice, however, the usable amount is considerably 131 * lower due to fragmentation. 132 */ 133 #ifndef VM_SWZONE_SIZE_MAX 134 #define VM_SWZONE_SIZE_MAX (276 * 128 * 1024) 135 #endif 136 137 /* 138 * Ceiling on size of buffer cache (really only effects write queueing, 139 * the VM page cache is not effected), can be changed via 140 * the kern.maxbcache /boot/loader.conf variable. 141 * 142 * The value is equal to the size of the auto-tuned buffer map for 143 * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc(). 144 */ 145 #ifndef VM_BCACHE_SIZE_MAX 146 #define VM_BCACHE_SIZE_MAX (7224 * 16 * 1024) 147 #endif 148 149 /* 150 * Mach derived conversion macros 151 */ 152 #define trunc_page(x) ((x) & ~PAGE_MASK) 153 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 154 #define trunc_4mpage(x) ((x) & ~PDRMASK) 155 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 156 157 #define atop(x) ((x) >> PAGE_SHIFT) 158 #define ptoa(x) ((x) << PAGE_SHIFT) 159 160 #define i386_btop(x) ((x) >> PAGE_SHIFT) 161 #define i386_ptob(x) ((x) << PAGE_SHIFT) 162 163 #define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 164 165 #define INKERNEL(va) (TRUE) 166 167 #endif /* !_I386_INCLUDE_PARAM_H_ */ 168