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  * Copyright 2017 Joyent, Inc.
  27  */
  28 
  29 #ifndef _SYS_VM_MACHPARAM_H
  30 #define _SYS_VM_MACHPARAM_H
  31 
  32 #ifdef  __cplusplus
  33 extern "C" {
  34 #endif
  35 
  36 /*
  37  * Machine dependent constants for PC.
  38  */
  39 
  40 /*
  41  * USRTEXT is the start of the user text/data space.
  42  */
  43 #define USRTEXT         USRSTACK
  44 
  45 /*
  46  * Virtual memory related constants for UNIX resource control, all in bytes.
  47  * The default stack size (initial stack size limit) keeps the stack from
  48  * taking more than 2 page directory entries in addition to the part of
  49  * the page directory entry which also maps the initial text and data,
  50  * and makes the default slightly bigger than the 8MB on SPARC.
  51  */
  52 #ifdef __amd64
  53 /*
  54  * On amd64, the stack grows down from just below KERNELBASE (see the
  55  * definition of USERLIMIT in i86pc/sys/machparam.h). Theoretically,
  56  * it could grow down to the top of the VA hole (0xffff800000000000),
  57  * giving it a possible maximum of about 125T. For an amd64 xpv
  58  * kernel, all user VA space is below the VA hole. The theoretical
  59  * maximum for the stack is about the same, although it can't grow
  60  * to quite that size, since it would clash with the heap.
  61  *
  62  * Pick an upper limit that will work in both cases: 32T.
  63  *
  64  * For 32bit processes, the stack is below the text segment.
  65  */
  66 #define MAXSSIZ         (32ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL)
  67 #else
  68 #define MAXSSIZ         (USRSTACK - 1024*1024)
  69 #endif /* __amd64 */
  70 #define DFLSSIZ         (8*1024*1024 + ((USRSTACK) & 0x3FFFFF))
  71 
  72 /*
  73  * Size of the kernel segkmem system pte table.  This virtual
  74  * space is controlled by the resource map "kernelmap".
  75  */
  76 #define SYSPTSIZE       ((61*1024*1024) / MMU_PAGESIZE)
  77 
  78 /*
  79  * Size of the ethernet addressable kernel segkmem system pte table.
  80  * This virtual space is controlled by the resource map "ekernelmap".
  81  * The ethernet interfaces in some sun machines can address only
  82  * the upper 16 Megabytes of memory.  Since the ethernet
  83  * driver kmem_allocs its memory, we bias all kmem_allocs
  84  * to try ekernelmap first and if it fails try kernelmap.
  85  * Folks that allocate directly out of kernelmap, above,
  86  * get memory that is non-ethernet addressable.
  87  */
  88 #define E_SYSPTSIZE     (0x2000000 / MMU_PAGESIZE)
  89 
  90 /*
  91  * The virtual address space to be used by the seg_map segment
  92  * driver for fast kernel mappings.
  93  */
  94 #if defined(__i386)
  95 #define SEGMAPDEFAULT   (16 * 1024 * 1024)
  96 #define SEGMAPMAX       (128 * 1024 * 1024)
  97 #else
  98 #define SEGMAPDEFAULT   (64 * 1024 * 1024)
  99 #endif
 100 
 101 /*
 102  * The time for a process to be blocked before being very swappable.
 103  * This is a number of seconds which the system takes as being a non-trivial
 104  * amount of real time. You probably shouldn't change this;
 105  * it is used in subtle ways (fractions and multiples of it are, that is, like
 106  * half of a ``long time'', almost a long time, etc.)
 107  * It is related to human patience and other factors which don't really
 108  * change over time.
 109  */
 110 #define MAXSLP          20
 111 
 112 /*
 113  * A swapped in process is given a small amount of core without being bothered
 114  * by the page replacement algorithm. Basically this says that if you are
 115  * swapped in you deserve some resources. We protect the last SAFERSS
 116  * pages against paging and will just swap you out rather than paging you.
 117  * Note that each process has at least UPAGES pages which are not
 118  * paged anyways so this number just means a swapped in process is
 119  * given around 32k bytes.
 120  */
 121 /*
 122  * nominal ``small'' resident set size
 123  * protected against replacement
 124  */
 125 #define SAFERSS         3
 126 
 127 /*
 128  * DISKRPM is used to estimate the number of paging i/o operations
 129  * which one can expect from a single disk controller.
 130  *
 131  * XXX - The system doesn't account for multiple swap devices.
 132  */
 133 #define DISKRPM         60
 134 
 135 /*
 136  * The maximum value for handspreadpages which is the the distance
 137  * between the two clock hands in pages. This is only used when the page
 138  * scanner is first started.
 139  */
 140 #define MAXHANDSPREADPAGES      ((64 * 1024 * 1024) / PAGESIZE)
 141 
 142 /*
 143  * Paged text files that are less than PGTHRESH bytes
 144  * may be "prefaulted in" instead of demand paged.
 145  */
 146 #define PGTHRESH        (280 * 1024)
 147 
 148 #ifdef  __cplusplus
 149 }
 150 #endif
 151 
 152 #endif  /* _SYS_VM_MACHPARAM_H */