1 /* $NetBSD: vmparam.h,v 1.14 1998/01/08 11:39:30 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * All advertising materials mentioning features or use of this software 12 * must display the following acknowledgement: 13 * This product includes software developed by the University of 14 * California, Lawrence Berkeley Laboratory. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. All advertising materials mentioning features or use of this software 25 * must display the following acknowledgement: 26 * This product includes software developed by the University of 27 * California, Berkeley and its contributors. 28 * 4. Neither the name of the University nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 * 44 * @(#)vmparam.h 8.1 (Berkeley) 6/11/93 45 */ 46 47 /* 48 * Machine dependent constants for Sun-4c SPARC 49 */ 50 51 /* 52 * USRTEXT is the start of the user text/data space, while USRSTACK 53 * is the top (end) of the user stack. 54 */ 55 #define USRTEXT 0x2000 /* Start of user text */ 56 #define USRSTACK KERNBASE /* Start of user stack */ 57 58 /* 59 * Virtual memory related constants, all in bytes 60 */ 61 #ifndef MAXTSIZ 62 #define MAXTSIZ (64*1024*1024) /* max text size */ 63 #endif 64 #ifndef DFLDSIZ 65 #define DFLDSIZ (64*1024*1024) /* initial data size limit */ 66 #endif 67 #ifndef MAXDSIZ 68 #define MAXDSIZ (256*1024*1024) /* max data size */ 69 #endif 70 #ifndef DFLSSIZ 71 #define DFLSSIZ (512*1024) /* initial stack size limit */ 72 #endif 73 #ifndef MAXSSIZ 74 #define MAXSSIZ MAXDSIZ /* max stack size */ 75 #endif 76 77 /* 78 * Size of shared memory map 79 */ 80 #ifndef SHMMAXPGS 81 #define SHMMAXPGS 1024 82 #endif 83 84 /* 85 * The time for a process to be blocked before being very swappable. 86 * This is a number of seconds which the system takes as being a non-trivial 87 * amount of real time. You probably shouldn't change this; 88 * it is used in subtle ways (fractions and multiples of it are, that is, like 89 * half of a ``long time'', almost a long time, etc.) 90 * It is related to human patience and other factors which don't really 91 * change over time. 92 */ 93 #define MAXSLP 20 94 95 /* 96 * A swapped in process is given a small amount of core without being bothered 97 * by the page replacement algorithm. Basically this says that if you are 98 * swapped in you deserve some resources. We protect the last SAFERSS 99 * pages against paging and will just swap you out rather than paging you. 100 * Note that each process has at least UPAGES+CLSIZE pages which are not 101 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this 102 * number just means a swapped in process is given around 25k bytes. 103 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), 104 * so we loan each swapped in process memory worth 100$, or just admit 105 * that we don't consider it worthwhile and swap it out to disk which costs 106 * $30/mb or about $0.75. 107 * Update: memory prices have changed recently (9/96). At the current 108 * value of $6 per megabyte, we lend each swapped in process memory worth 109 * $0.15, or just admit that we don't consider it worthwhile and swap it out 110 * to disk which costs $0.20/MB, or just under half a cent. 111 */ 112 #define SAFERSS 4 /* nominal ``small'' resident set size 113 protected against replacement */ 114 115 /* 116 * Mach derived constants 117 */ 118 119 /* 120 * User/kernel map constants. Note that sparc/vaddrs.h defines the 121 * IO space virtual base, which must be the same as VM_MAX_KERNEL_ADDRESS: 122 * tread with care. 123 */ 124 #define VM_MIN_ADDRESS ((vm_offset_t)0) 125 #define VM_MAX_ADDRESS ((vm_offset_t)KERNBASE) 126 #define VM_MAXUSER_ADDRESS ((vm_offset_t)KERNBASE) 127 #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE) 128 #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xfe000000) 129 130 /* virtual sizes (bytes) for various kernel submaps */ 131 #define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) 132 #define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES) 133 134 #if defined(MACHINE_NEW_NONCONTIG) 135 136 #define VM_PHYSSEG_MAX 32 /* we only have one "hole" */ 137 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 138 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 139 140 /* 141 * pmap specific data stored in the vm_physmem[] array 142 */ 143 144 struct pmap_physseg { 145 /* NULL */ 146 }; 147 148 149 #else 150 #define MACHINE_NONCONTIG /* VM <=> pmap interface modifier */ 151 #endif 152 153 #if defined (_KERNEL) && !defined(_LOCORE) 154 struct vm_map; 155 vm_offset_t dvma_mapin __P((struct vm_map *, vm_offset_t, int, int)); 156 void dvma_mapout __P((vm_offset_t, vm_offset_t, int)); 157 #endif 158