vmparam.h revision 1.40
1 /* $NetBSD: vmparam.h,v 1.40 2001/01/03 20:19:33 fvdl Exp $ */ 2 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91 39 */ 40 41 #ifndef _VMPARAM_H_ 42 #define _VMPARAM_H_ 43 44 /* 45 * Machine dependent constants for 386. 46 */ 47 48 /* 49 * Page size on the IA-32 is not variable in the traditional sense. 50 * We override the PAGE_* definitions to compile-time constants. 51 */ 52 #define PAGE_SHIFT 12 53 #define PAGE_SIZE (1 << PAGE_SHIFT) 54 #define PAGE_MASK (PAGE_SIZE - 1) 55 56 /* 57 * Virtual address space arrangement. On 386, both user and kernel 58 * share the address space, not unlike the vax. 59 * USRTEXT is the start of the user text/data space, while USRSTACK 60 * is the top (end) of the user stack. Immediately above the user stack 61 * resides the user structure, which is UPAGES long and contains the 62 * kernel stack. 63 * 64 * Immediately after the user structure is the page table map, and then 65 * kernal address space. 66 */ 67 #define USRTEXT NBPG 68 #define USRSTACK VM_MAXUSER_ADDRESS 69 70 /* 71 * Virtual memory related constants, all in bytes 72 */ 73 #define MAXTSIZ (64*1024*1024) /* max text size */ 74 #ifndef DFLDSIZ 75 #define DFLDSIZ (128*1024*1024) /* initial data size limit */ 76 #endif 77 #ifndef MAXDSIZ 78 #define MAXDSIZ (1*1024*1024*1024) /* max data size */ 79 #endif 80 #ifndef DFLSSIZ 81 #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ 82 #endif 83 #ifndef MAXSSIZ 84 #define MAXSSIZ (32*1024*1024) /* max stack size */ 85 #endif 86 87 /* 88 * Size of shared memory map 89 */ 90 #ifndef SHMMAXPGS 91 #define SHMMAXPGS 2048 92 #endif 93 94 /* 95 * Size of User Raw I/O map 96 */ 97 #define USRIOSIZE 300 98 99 /* 100 * The time for a process to be blocked before being very swappable. 101 * This is a number of seconds which the system takes as being a non-trivial 102 * amount of real time. You probably shouldn't change this; 103 * it is used in subtle ways (fractions and multiples of it are, that is, like 104 * half of a ``long time'', almost a long time, etc.) 105 * It is related to human patience and other factors which don't really 106 * change over time. 107 */ 108 #define MAXSLP 20 109 110 /* 111 * Mach derived constants 112 */ 113 114 /* user/kernel map constants */ 115 #define VM_MIN_ADDRESS ((vaddr_t)0) 116 /* (PDSLOT_PTE << PDSHIFT) - UPAGES*NBPG */ 117 #define VM_MAXUSER_ADDRESS ((vaddr_t)0xbfbfe000) 118 /* (PDSLOT_PTE << PDSHIFT) + (PDSLOT_PTE << PGSHIFT) */ 119 #define VM_MAX_ADDRESS ((vaddr_t)0xbfeff000) 120 /* PDSLOT_KERN << PDSHIFT */ 121 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0xc0000000) 122 /* PDSLOT_APTE << PDSHIFT */ 123 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0xffc00000) 124 125 /* XXX max. amount of KVM to be used by buffers. */ 126 #ifndef VM_MAX_KERNEL_BUF 127 #define VM_MAX_KERNEL_BUF \ 128 ((VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 1024 * 7 / 10 * 1024) 129 #endif 130 131 /* virtual sizes (bytes) for various kernel submaps */ 132 #define VM_PHYS_SIZE (USRIOSIZE*NBPG) 133 134 #define VM_PHYSSEG_MAX 5 /* 1 "hole" + 4 free lists */ 135 #define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST 136 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 137 138 #define VM_NFREELIST 2 139 #define VM_FREELIST_DEFAULT 0 140 #define VM_FREELIST_FIRST16 1 141 142 /* 143 * pmap specific data stored in the vm_physmem[] array 144 */ 145 struct pmap_physseg { 146 struct pv_head *pvhead; /* pv_head array */ 147 char *attrs; /* attrs array */ 148 }; 149 150 #endif /* _VMPARAM_H_ */ 151
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