1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)param.h 5.8 (Berkeley) 6/28/91 33 * $FreeBSD$ 34 */ 35 36 #include <machine/_align.h> 37 38 #ifndef _I386_INCLUDE_PARAM_H_ 39 #define _I386_INCLUDE_PARAM_H_ 40 41 /* 42 * Machine dependent constants for Intel 386. 43 */ 44 45 /* 46 * Round p (pointer or byte index) up to a correctly-aligned value 47 * for all data types (int, long, ...). The result is unsigned int 48 * and must be cast to any desired pointer type. 49 */ 50 #ifndef _ALIGNBYTES 51 #define _ALIGNBYTES (sizeof(int) - 1) 52 #endif 53 #ifndef _ALIGN 54 #define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES) 55 #endif 56 57 58 #define __HAVE_ACPI 59 #define __HAVE_PIR 60 #define __PCI_REROUTE_INTERRUPT 61 62 #ifndef MACHINE 63 #define MACHINE "i386" 64 #endif 65 #ifndef MACHINE_ARCH 66 #define MACHINE_ARCH "i386" 67 #endif 68 #define MID_MACHINE MID_I386 69 70 #if defined(SMP) || defined(KLD_MODULE) 71 #ifndef MAXCPU 72 #define MAXCPU 32 73 #endif 74 #else 75 #define MAXCPU 1 76 #endif /* SMP || KLD_MODULE */ 77 78 #define ALIGNBYTES _ALIGNBYTES 79 #define ALIGN(p) _ALIGN(p) 80 /* 81 * ALIGNED_POINTER is a boolean macro that checks whether an address 82 * is valid to fetch data elements of type t from on this architecture. 83 * This does not reflect the optimal alignment, just the possibility 84 * (within reasonable limits). 85 */ 86 #define ALIGNED_POINTER(p, t) 1 87 88 /* 89 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an 90 * architecture. It should be used with appropriate caution. 91 */ 92 #define CACHE_LINE_SHIFT 7 93 #define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT) 94 95 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 96 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 97 #define PAGE_MASK (PAGE_SIZE-1) 98 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 99 100 #ifdef PAE 101 #define NPGPTD 4 102 #define PDRSHIFT 21 /* LOG2(NBPDR) */ 103 #define NPGPTD_SHIFT 9 104 #else 105 #define NPGPTD 1 106 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 107 #define NPGPTD_SHIFT 10 108 #endif 109 110 #define NBPTD (NPGPTD<<PAGE_SHIFT) 111 #define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 112 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 113 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 114 #define PDRMASK (NBPDR-1) 115 116 #define MAXPAGESIZES 2 /* maximum number of supported page sizes */ 117 118 #define IOPAGES 2 /* pages of i/o permission bitmap */ 119 120 #ifndef KSTACK_PAGES 121 #define KSTACK_PAGES 2 /* Includes pcb! */ 122 #endif 123 #define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 124 125 /* 126 * Ceiling on amount of swblock kva space, can be changed via 127 * the kern.maxswzone /boot/loader.conf variable. 128 * 129 * 276 is sizeof(struct swblock), but we do not always have a definition 130 * in scope for struct swblock, so we have to hardcode it. Each struct 131 * swblock holds metadata for 32 pages, so in theory, this is enough for 132 * 16 GB of swap. In practice, however, the usable amount is considerably 133 * lower due to fragmentation. 134 */ 135 #ifndef VM_SWZONE_SIZE_MAX 136 #define VM_SWZONE_SIZE_MAX (276 * 128 * 1024) 137 #endif 138 139 /* 140 * Ceiling on size of buffer cache (really only effects write queueing, 141 * the VM page cache is not effected), can be changed via 142 * the kern.maxbcache /boot/loader.conf variable. 143 */ 144 #ifndef VM_BCACHE_SIZE_MAX 145 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) 146 #endif 147 148 /* 149 * Mach derived conversion macros 150 */ 151 #define trunc_page(x) ((x) & ~PAGE_MASK) 152 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 153 #define trunc_4mpage(x) ((x) & ~PDRMASK) 154 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 155 156 #define atop(x) ((x) >> PAGE_SHIFT) 157 #define ptoa(x) ((x) << PAGE_SHIFT) 158 159 #define i386_btop(x) ((x) >> PAGE_SHIFT) 160 #define i386_ptob(x) ((x) << PAGE_SHIFT) 161 162 #define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 163 164 #endif /* !_I386_INCLUDE_PARAM_H_ */ 165