1 /* 2 * Copyright (c) 1992 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * %sccs.include.redist.c% 10 * 11 * @(#)vmparam.h 7.1 (Berkeley) 07/13/92 12 * 13 * from: $Header: vmparam.h,v 1.6 92/06/24 08:55:18 torek Exp $ 14 */ 15 16 /* 17 * Machine dependent constants for Sun-4c SPARC 18 */ 19 20 /* 21 * USRTEXT is the start of the user text/data space, while USRSTACK 22 * is the top (end) of the user stack. 23 */ 24 #define USRTEXT 0x2000 /* Start of user text */ 25 #define USRSTACK KERNBASE /* Start of user stack */ 26 27 /* 28 * Virtual memory related constants, all in bytes 29 */ 30 #ifndef MAXTSIZ 31 #define MAXTSIZ (6*1024*1024) /* max text size */ 32 #endif 33 #ifndef DFLDSIZ 34 #define DFLDSIZ (8*1024*1024) /* initial data size limit */ 35 #endif 36 #ifndef MAXDSIZ 37 #define MAXDSIZ (16*1024*1024) /* max data size */ 38 #endif 39 #ifndef DFLSSIZ 40 #define DFLSSIZ (512*1024) /* initial stack size limit */ 41 #endif 42 #ifndef MAXSSIZ 43 #define MAXSSIZ MAXDSIZ /* max stack size */ 44 #endif 45 46 /* 47 * Default sizes of swap allocation chunks (see dmap.h). 48 * The actual values may be changed in vminit() based on MAXDSIZ. 49 * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024. 50 * DMMIN should be at least ctod(1) so that vtod() works. 51 * vminit() insures this. 52 */ 53 #define DMMIN 32 /* smallest swap allocation */ 54 #define DMMAX 4096 /* largest potential swap allocation */ 55 #define DMTEXT 1024 /* swap allocation for text */ 56 57 /* 58 * The time for a process to be blocked before being very swappable. 59 * This is a number of seconds which the system takes as being a non-trivial 60 * amount of real time. You probably shouldn't change this; 61 * it is used in subtle ways (fractions and multiples of it are, that is, like 62 * half of a ``long time'', almost a long time, etc.) 63 * It is related to human patience and other factors which don't really 64 * change over time. 65 */ 66 #define MAXSLP 20 67 68 /* 69 * A swapped in process is given a small amount of core without being bothered 70 * by the page replacement algorithm. Basically this says that if you are 71 * swapped in you deserve some resources. We protect the last SAFERSS 72 * pages against paging and will just swap you out rather than paging you. 73 * Note that each process has at least UPAGES+CLSIZE pages which are not 74 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this 75 * number just means a swapped in process is given around 25k bytes. 76 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), 77 * so we loan each swapped in process memory worth 100$, or just admit 78 * that we don't consider it worthwhile and swap it out to disk which costs 79 * $30/mb or about $0.75. 80 */ 81 #define SAFERSS 4 /* nominal ``small'' resident set size 82 protected against replacement */ 83 84 /* 85 * Mach derived constants 86 */ 87 88 /* 89 * User/kernel map constants. Note that sparc/vaddrs.h defines the 90 * IO space virtual base, which must be the same as VM_MAX_KERNEL_ADDRESS: 91 * tread with care. 92 */ 93 #define VM_MIN_ADDRESS ((vm_offset_t)0x2000) /* texts start at 8K */ 94 #define VM_MAX_ADDRESS ((vm_offset_t)KERNBASE) 95 #define VM_MAXUSER_ADDRESS ((vm_offset_t)KERNBASE) 96 #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE) 97 #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xfe000000) 98 99 /* virtual sizes (bytes) for various kernel submaps */ 100 #define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) 101 #define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES) 102