1 /* $NetBSD: vmparam.h,v 1.17 1999/12/04 21:20:49 ragge Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department and Ralph Campbell. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: Utah Hdr: vmparam.h 1.16 91/01/18 41 * 42 * @(#)vmparam.h 8.2 (Berkeley) 4/22/94 43 */ 44 45 #ifndef _MIPS_VMPARAM_H_ 46 #define _MIPS_VMPARAM_H_ 47 48 /* 49 * Machine dependent VM constants for MIPS. 50 */ 51 52 /* 53 * USRTEXT is the start of the user text/data space, while USRSTACK 54 * is the top (end) of the user stack. 55 */ 56 #define USRTEXT 0x00001000 /* Start of user text */ 57 #define USRSTACK 0x80000000 /* Start of user stack */ 58 59 /* 60 * Virtual memory related constants, all in bytes 61 */ 62 #ifndef MAXTSIZ 63 #define MAXTSIZ (24*1024*1024) /* max text size */ 64 #endif 65 #ifndef DFLDSIZ 66 #define DFLDSIZ (32*1024*1024) /* initial data size limit */ 67 #endif 68 #ifndef MAXDSIZ 69 #define MAXDSIZ (256*1024*1024) /* max data size */ 70 #endif 71 #ifndef DFLSSIZ 72 #define DFLSSIZ (1024*1024) /* initial stack size limit */ 73 #endif 74 #ifndef MAXSSIZ 75 #define MAXSSIZ (32*1024*1024) /* max stack size */ 76 #endif 77 78 /* 79 * PTEs for mapping user space into the kernel for phyio operations. 80 * 16 pte's are enough to cover 8 disks * MAXBSIZE. 81 */ 82 #ifndef USRIOSIZE 83 #define USRIOSIZE 32 84 #endif 85 86 /* 87 * PTEs for system V style shared memory. 88 * This is basically slop for kmempt which we actually allocate (malloc) from. 89 */ 90 #ifndef SHMMAXPGS 91 #define SHMMAXPGS 1024 /* 4mb */ 92 #endif 93 94 /* 95 * The time for a process to be blocked before being very swappable. 96 * This is a number of seconds which the system takes as being a non-trivial 97 * amount of real time. You probably shouldn't change this; 98 * it is used in subtle ways (fractions and multiples of it are, that is, like 99 * half of a ``long time'', almost a long time, etc.) 100 * It is related to human patience and other factors which don't really 101 * change over time. 102 */ 103 #define MAXSLP 20 104 105 /* 106 * A swapped in process is given a small amount of core without being bothered 107 * by the page replacement algorithm. Basically this says that if you are 108 * swapped in you deserve some resources. We protect the last SAFERSS 109 * pages against paging and will just swap you out rather than paging you. 110 * Note that each process has at least UPAGES pages which are not 111 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this 112 * number just means a swapped in process is given around 25k bytes. 113 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), 114 * so we loan each swapped in process memory worth 100$, or just admit 115 * that we don't consider it worthwhile and swap it out to disk which costs 116 * $30/mb or about $0.75. 117 * Update: memory prices have changed recently (9/96). At the current 118 * value of $6 per megabyte, we lend each swapped in process memory worth 119 * $0.15, or just admit that we don't consider it worthwhile and swap it out 120 * to disk which costs $0.20/MB, or just under half a cent. 121 */ 122 #define SAFERSS 4 /* nominal ``small'' resident set size 123 protected against replacement */ 124 125 #define mapin(pte, v, pfnum, prot) \ 126 (*(int *)(pte) = ((pfnum) << PG_SHIFT) | (prot), MachTLBFlushAddr(v)) 127 128 /* 129 * Mach derived constants 130 */ 131 132 /* user/kernel map constants */ 133 #define VM_MIN_ADDRESS ((vaddr_t)0x00000000) 134 #define VM_MAXUSER_ADDRESS ((vaddr_t)0x80000000) 135 #define VM_MAX_ADDRESS ((vaddr_t)0x80000000) 136 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0xC0000000) 137 #ifdef ENABLE_MIPS_TX3900 138 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0xFF000000) 139 #else 140 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0xFFFFC000) 141 #endif 142 143 /* virtual sizes (bytes) for various kernel submaps */ 144 #define VM_KMEM_SIZE (NKMEMCLUSTERS*NBPG) 145 #define VM_PHYS_SIZE (USRIOSIZE*NBPG) 146 147 /* VM_PHYSSEG_MAX defined by platform-dependent code. */ 148 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 149 #define VM_PHYSSEG_NOADD /* no more after vm_mem_init */ 150 151 /* 152 * pmap-specific data stored in the vm_physmem[] array. 153 */ 154 struct pmap_physseg { 155 struct pv_entry *pvent; /* pv table for this seg */ 156 char *attrs; /* page attributes for this seg */ 157 }; 158 159 #endif /* ! _MIPS_VMPARAM_H_ */ 160