1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1988 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #ifndef _SYS_VM_MACHPARAM_H 32 #define _SYS_VM_MACHPARAM_H 33 34 #pragma ident "%Z%%M% %I% %E% SMI" 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 /* 41 * Machine dependent constants for PC. 42 */ 43 44 /* 45 * USRTEXT is the start of the user text/data space. 46 */ 47 #define USRTEXT USRSTACK 48 49 /* 50 * Virtual memory related constants for UNIX resource control, all in bytes. 51 * The default stack size (initial stack size limit) keeps the stack from 52 * taking more than 2 page directory entries in addition to the part of 53 * the page directory entry which also maps the initial text and data, 54 * and makes the default slightly bigger than the 8MB on SPARC. 55 */ 56 #ifdef __amd64 57 /* 58 * The maximum stack size on amd64 is chosen to allow the stack to consume 59 * all the va space between the top of the user's virtual address space and 60 * the top of the va hole. 61 */ 62 #define MAXSSIZ (USRSTACK - 0xFFFF800000000000) 63 #else 64 #define MAXSSIZ (USRSTACK - 1024*1024) 65 #endif 66 #define DFLSSIZ (8*1024*1024 + ((USRSTACK) & 0x3FFFFF)) 67 68 /* 69 * The following are limits beyond which the hard or soft limits for stack 70 * and data cannot be increased. These may be viewed as fundamental 71 * characteristics of the system. Note: a bug in SVVS requires that the 72 * default hard limit be increasable, so the default hard limit must be 73 * less than these physical limits. 74 */ 75 #define DSIZE_LIMIT (USERLIMIT-USRTEXT) /* physical data limit */ 76 #define SSIZE_LIMIT (USRSTACK) /* physical stack limit */ 77 78 /* 79 * Size of the kernel segkmem system pte table. This virtual 80 * space is controlled by the resource map "kernelmap". 81 */ 82 #define SYSPTSIZE ((61*1024*1024) / MMU_PAGESIZE) 83 84 /* 85 * Size of the ethernet addressable kernel segkmem system pte table. 86 * This virtual space is controlled by the resource map "ekernelmap". 87 * The ethernet interfaces in some sun machines can address only 88 * the upper 16 Megabytes of memory. Since the ethernet 89 * driver kmem_allocs its memory, we bias all kmem_allocs 90 * to try ekernelmap first and if it fails try kernelmap. 91 * Folks that allocate directly out of kernelmap, above, 92 * get memory that is non-ethernet addressable. 93 */ 94 #define E_SYSPTSIZE (0x2000000 / MMU_PAGESIZE) 95 96 /* 97 * The virtual address space to be used by the seg_map segment 98 * driver for fast kernel mappings. 99 */ 100 #if defined(__i386) 101 #define SEGMAPDEFAULT (16 * 1024 * 1024) 102 #define SEGMAPMAX (128 * 1024 * 1024) 103 #else 104 #define SEGMAPDEFAULT (64 * 1024 * 1024) 105 #endif 106 107 /* 108 * The time for a process to be blocked before being very swappable. 109 * This is a number of seconds which the system takes as being a non-trivial 110 * amount of real time. You probably shouldn't change this; 111 * it is used in subtle ways (fractions and multiples of it are, that is, like 112 * half of a ``long time'', almost a long time, etc.) 113 * It is related to human patience and other factors which don't really 114 * change over time. 115 */ 116 #define MAXSLP 20 117 118 /* 119 * A swapped in process is given a small amount of core without being bothered 120 * by the page replacement algorithm. Basically this says that if you are 121 * swapped in you deserve some resources. We protect the last SAFERSS 122 * pages against paging and will just swap you out rather than paging you. 123 * Note that each process has at least UPAGES pages which are not 124 * paged anyways so this number just means a swapped in process is 125 * given around 32k bytes. 126 */ 127 /* 128 * nominal ``small'' resident set size 129 * protected against replacement 130 */ 131 #define SAFERSS 3 132 133 /* 134 * DISKRPM is used to estimate the number of paging i/o operations 135 * which one can expect from a single disk controller. 136 * 137 * XXX - The system doesn't account for multiple swap devices. 138 */ 139 #define DISKRPM 60 140 141 /* 142 * The maximum value for handspreadpages which is the the distance 143 * between the two clock hands in pages. 144 */ 145 #define MAXHANDSPREADPAGES ((64 * 1024 * 1024) / PAGESIZE) 146 147 /* 148 * Paged text files that are less than PGTHRESH bytes 149 * may be "prefaulted in" instead of demand paged. 150 */ 151 #define PGTHRESH (280 * 1024) 152 153 #ifdef __cplusplus 154 } 155 #endif 156 157 #endif /* _SYS_VM_MACHPARAM_H */ 158