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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* Copyright (c) 1988 AT&T */ 22 /* All Rights Reserved */ 23 /* 24 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #ifndef _SYS_VM_MACHPARAM_H 29 #define _SYS_VM_MACHPARAM_H 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 /* 38 * Machine dependent constants for PC. 39 */ 40 41 /* 42 * USRTEXT is the start of the user text/data space. 43 */ 44 #define USRTEXT USRSTACK 45 46 /* 47 * Virtual memory related constants for UNIX resource control, all in bytes. 48 * The default stack size (initial stack size limit) keeps the stack from 49 * taking more than 2 page directory entries in addition to the part of 50 * the page directory entry which also maps the initial text and data, 51 * and makes the default slightly bigger than the 8MB on SPARC. 52 */ 53 #ifdef __amd64 54 /* 55 * On amd64, the stack grows down from just below KERNELBASE (see the 56 * definition of USERLIMIT in i86pc/sys/machparam.h). Theoretically, 57 * it could grow down to the top of the VA hole (0xffff800000000000), 58 * giving it a possible maximum of about 125T. For an amd64 xpv 59 * kernel, all user VA space is below the VA hole. The theoretical 60 * maximum for the stack is about the same, although it can't grow 61 * to quite that size, since it would clash with the heap. 62 * 63 * Pick an upper limit that will work in both cases: 32T. 64 * 65 * For 32bit processes, the stack is below the text segment. 66 */ 67 #define MAXSSIZ (32ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL) 68 #else 69 #define MAXSSIZ (USRSTACK - 1024*1024) 70 #endif /* __amd64 */ 71 #define DFLSSIZ (8*1024*1024 + ((USRSTACK) & 0x3FFFFF)) 72 73 /* 74 * The following are limits beyond which the hard or soft limits for stack 75 * and data cannot be increased. These may be viewed as fundamental 76 * characteristics of the system. Note: a bug in SVVS requires that the 77 * default hard limit be increasable, so the default hard limit must be 78 * less than these physical limits. 79 */ 80 #define DSIZE_LIMIT (USERLIMIT-USRTEXT) /* physical data limit */ 81 #define SSIZE_LIMIT (USRSTACK) /* physical stack limit */ 82 83 /* 84 * Size of the kernel segkmem system pte table. This virtual 85 * space is controlled by the resource map "kernelmap". 86 */ 87 #define SYSPTSIZE ((61*1024*1024) / MMU_PAGESIZE) 88 89 /* 90 * Size of the ethernet addressable kernel segkmem system pte table. 91 * This virtual space is controlled by the resource map "ekernelmap". 92 * The ethernet interfaces in some sun machines can address only 93 * the upper 16 Megabytes of memory. Since the ethernet 94 * driver kmem_allocs its memory, we bias all kmem_allocs 95 * to try ekernelmap first and if it fails try kernelmap. 96 * Folks that allocate directly out of kernelmap, above, 97 * get memory that is non-ethernet addressable. 98 */ 99 #define E_SYSPTSIZE (0x2000000 / MMU_PAGESIZE) 100 101 /* 102 * The virtual address space to be used by the seg_map segment 103 * driver for fast kernel mappings. 104 */ 105 #if defined(__i386) 106 #define SEGMAPDEFAULT (16 * 1024 * 1024) 107 #define SEGMAPMAX (128 * 1024 * 1024) 108 #else 109 #define SEGMAPDEFAULT (64 * 1024 * 1024) 110 #endif 111 112 /* 113 * The time for a process to be blocked before being very swappable. 114 * This is a number of seconds which the system takes as being a non-trivial 115 * amount of real time. You probably shouldn't change this; 116 * it is used in subtle ways (fractions and multiples of it are, that is, like 117 * half of a ``long time'', almost a long time, etc.) 118 * It is related to human patience and other factors which don't really 119 * change over time. 120 */ 121 #define MAXSLP 20 122 123 /* 124 * A swapped in process is given a small amount of core without being bothered 125 * by the page replacement algorithm. Basically this says that if you are 126 * swapped in you deserve some resources. We protect the last SAFERSS 127 * pages against paging and will just swap you out rather than paging you. 128 * Note that each process has at least UPAGES pages which are not 129 * paged anyways so this number just means a swapped in process is 130 * given around 32k bytes. 131 */ 132 /* 133 * nominal ``small'' resident set size 134 * protected against replacement 135 */ 136 #define SAFERSS 3 137 138 /* 139 * DISKRPM is used to estimate the number of paging i/o operations 140 * which one can expect from a single disk controller. 141 * 142 * XXX - The system doesn't account for multiple swap devices. 143 */ 144 #define DISKRPM 60 145 146 /* 147 * The maximum value for handspreadpages which is the the distance 148 * between the two clock hands in pages. 149 */ 150 #define MAXHANDSPREADPAGES ((64 * 1024 * 1024) / PAGESIZE) 151 152 /* 153 * Paged text files that are less than PGTHRESH bytes 154 * may be "prefaulted in" instead of demand paged. 155 */ 156 #define PGTHRESH (280 * 1024) 157 158 #ifdef __cplusplus 159 } 160 #endif 161 162 #endif /* _SYS_VM_MACHPARAM_H */ 163