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