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 /* 37 * Machine dependent constants for Intel 386. 38 */ 39 40 /* 41 * Round p (pointer or byte index) up to a correctly-aligned value 42 * for all data types (int, long, ...). The result is unsigned int 43 * and must be cast to any desired pointer type. 44 */ 45 #ifndef _ALIGNBYTES 46 #define _ALIGNBYTES (sizeof(int) - 1) 47 #endif 48 #ifndef _ALIGN 49 #define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES) 50 #endif 51 52 #ifndef _MACHINE 53 #define _MACHINE i386 54 #endif 55 #ifndef _MACHINE_ARCH 56 #define _MACHINE_ARCH i386 57 #endif 58 59 #ifndef _NO_NAMESPACE_POLLUTION 60 61 #ifndef _MACHINE_PARAM_H_ 62 #define _MACHINE_PARAM_H_ 63 64 #ifndef MACHINE 65 #define MACHINE "i386" 66 #endif 67 #ifndef MACHINE_ARCH 68 #define MACHINE_ARCH "i386" 69 #endif 70 #define MID_MACHINE MID_I386 71 72 #ifdef SMP 73 #define MAXCPU 16 74 #else 75 #define MAXCPU 1 76 #endif /* SMP */ 77 78 #define ALIGNBYTES _ALIGNBYTES 79 #define ALIGN(p) _ALIGN(p) 80 81 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ 82 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ 83 #define PAGE_MASK (PAGE_SIZE-1) 84 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 85 86 #ifdef PAE 87 #define NPGPTD 4 88 #define PDRSHIFT 21 /* LOG2(NBPDR) */ 89 #else 90 #define NPGPTD 1 91 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 92 #endif 93 94 #define NBPTD (NPGPTD<<PAGE_SHIFT) 95 #define NPDEPTD (NBPTD/(sizeof (pd_entry_t))) 96 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) 97 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ 98 #define PDRMASK (NBPDR-1) 99 100 /* PREEMPTION exposes scheduler bugs that need to be fixed. */ 101 #if 0 102 #define PREEMPTION 103 #endif 104 105 #define IOPAGES 2 /* pages of i/o permission bitmap */ 106 107 #ifndef KSTACK_PAGES 108 #define KSTACK_PAGES 2 /* Includes pcb! */ 109 #endif 110 #define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */ 111 #define UAREA_PAGES 1 /* holds struct user WITHOUT PCB (see def.) */ 112 113 /* 114 * Ceiling on amount of swblock kva space, can be changed via 115 * the kern.maxswzone /boot/loader.conf variable. 116 */ 117 #ifndef VM_SWZONE_SIZE_MAX 118 #define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024) 119 #endif 120 121 /* 122 * Ceiling on size of buffer cache (really only effects write queueing, 123 * the VM page cache is not effected), can be changed via 124 * the kern.maxbcache /boot/loader.conf variable. 125 */ 126 #ifndef VM_BCACHE_SIZE_MAX 127 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024) 128 #endif 129 130 /* 131 * Mach derived conversion macros 132 */ 133 #define trunc_page(x) ((x) & ~PAGE_MASK) 134 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK) 135 #define trunc_4mpage(x) ((x) & ~PDRMASK) 136 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK) 137 138 #define atop(x) ((x) >> PAGE_SHIFT) 139 #define ptoa(x) ((x) << PAGE_SHIFT) 140 141 #define i386_btop(x) ((x) >> PAGE_SHIFT) 142 #define i386_ptob(x) ((x) << PAGE_SHIFT) 143 144 #define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 145 146 #endif /* !_MACHINE_PARAM_H_ */ 147 #endif /* !_NO_NAMESPACE_POLLUTION */ 148