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