vmparam3.h revision 1.17
1/* $NetBSD: vmparam3.h,v 1.17 1997/05/29 21:18:42 gwr Exp $ */ 2 3/* 4 * Copyright (c) 1994 Gordon W. Ross 5 * Copyright (c) 1993 Adam Glass 6 * Copyright (c) 1988 University of Utah. 7 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * the Systems Programming Group of the University of Utah Computer 12 * Science Department. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * from: Utah $Hdr: vmparam.h 1.16 91/01/18$ 43 * from: @(#)vmparam.h 7.3 (Berkeley) 5/7/91 44 * vmparam.h,v 1.2 1993/05/22 07:58:38 cgd Exp 45 */ 46 47/* 48 * Machine dependent constants for Sun3 49 * 50 * The Sun3 has limited total kernel virtual space (32MB) and 51 * can not use main memory for page tables. (All active PTEs 52 * must be installed in special translation RAM in the MMU). 53 * Therefore, parameters that would normally configure the 54 * size of various page tables are irrelevant. Only things 55 * that consume portions of kernel virtual (KV) space matter, 56 * and those things should be chosen to conserve KV space. 57 */ 58 59/* 60 * USRTEXT is the start of the user text/data space, while 61 * USRSTACK is the top (end) of the user stack. 62 */ 63#define USRTEXT NBPG /* Start of user text */ 64#define USRSTACK KERNBASE /* High end of user stack */ 65 66/* 67 * Virtual memory related constants, all in bytes 68 */ 69#ifndef MAXTSIZ 70#define MAXTSIZ (8*1024*1024) /* max text size */ 71#endif 72#ifndef DFLDSIZ 73#define DFLDSIZ (16*1024*1024) /* initial data size limit */ 74#endif 75#ifndef MAXDSIZ 76#define MAXDSIZ (32*1024*1024) /* max data size */ 77#endif 78#ifndef DFLSSIZ 79#define DFLSSIZ (512*1024) /* initial stack size limit */ 80#endif 81#ifndef MAXSSIZ 82#define MAXSSIZ MAXDSIZ /* max stack size */ 83#endif 84 85/* 86 * Default sizes of swap allocation chunks (see dmap.h). 87 * The actual values may be changed in vminit() based on MAXDSIZ. 88 * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024. 89 * DMMIN should be at least ctod(1) so that vtod() works. 90 * vminit() insures this. 91 */ 92#define DMMIN 32 /* smallest swap allocation */ 93#define DMMAX 4096 /* largest potential swap allocation */ 94 95/* 96 * PTEs for mapping user space into the kernel for phyio operations. 97 * The actual limitation for physio requests will be the DVMA space, 98 * and that is fixed by hardware design at 1MB. We could make the 99 * physio map larger than that, but it would not buy us much. 100 */ 101#ifndef USRIOSIZE 102#define USRIOSIZE 128 /* 1 MB */ 103#endif 104 105/* 106 * PTEs for system V style shared memory. 107 * This is basically slop for kmempt which we actually allocate (malloc) from. 108 */ 109#ifndef SHMMAXPGS 110#define SHMMAXPGS 512 /* 4 MB */ 111#endif 112 113/* 114 * The time for a process to be blocked before being very swappable. 115 * This is a number of seconds which the system takes as being a non-trivial 116 * amount of real time. You probably shouldn't change this; 117 * it is used in subtle ways (fractions and multiples of it are, that is, like 118 * half of a ``long time'', almost a long time, etc.) 119 * It is related to human patience and other factors which don't really 120 * change over time. 121 */ 122#define MAXSLP 20 123 124/* 125 * A swapped in process is given a small amount of core without being bothered 126 * by the page replacement algorithm. Basically this says that if you are 127 * swapped in you deserve some resources. We protect the last SAFERSS 128 * pages against paging and will just swap you out rather than paging you. 129 * Note that each process has at least UPAGES+CLSIZE pages which are not 130 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this 131 * number just means a swapped in process is given around 25k bytes. 132 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), 133 * so we loan each swapped in process memory worth 100$, or just admit 134 * that we don't consider it worthwhile and swap it out to disk which costs 135 * $30/mb or about $0.75. 136 */ 137#define SAFERSS 4 /* nominal ``small'' resident set size 138 protected against replacement */ 139 140/* 141 * Mach-derived constants, virtual memory map: 142 * 143 * 0000.0000 user space 144 * 0E00.0000 kernel space 145 * 0FE0.0000 monitor map (devices) 146 * 0FF0.0000 DVMA space 147 * 0FFE.0000 monitor RAM seg. 148 * 0FFF.E000 monitor RAM page 149 */ 150 151/* user/kernel map constants */ 152#define VM_MIN_ADDRESS ((vm_offset_t)0) 153#define VM_MAX_ADDRESS ((vm_offset_t)KERNBASE) 154#define VM_MAXUSER_ADDRESS ((vm_offset_t)KERNBASE) 155#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE) 156#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)KERN_END) 157 158/* virtual sizes (bytes) for various kernel submaps */ 159#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) 160#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES) 161#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES) 162 163#define MACHINE_NONCONTIG /* VM <=> pmap interface modifier */ 164