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