236 lines
8.2 KiB
C
236 lines
8.2 KiB
C
/* $NetBSD: vmparam.h,v 1.8 1997/07/12 16:19:28 perry Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department and Ralph Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah Hdr: vmparam.h 1.16 91/01/18
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*
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* @(#)vmparam.h 8.2 (Berkeley) 4/22/94
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*/
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/*
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* Machine dependent constants for DEC Station 3100.
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*/
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/*
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* USRTEXT is the start of the user text/data space, while USRSTACK
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* is the top (end) of the user stack. LOWPAGES and HIGHPAGES are
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* the number of pages from the beginning of the P0 region to the
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* beginning of the text and from the beginning of the P1 region to the
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* beginning of the stack respectively.
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*/
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#define USRTEXT 0x00001000
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#define USRSTACK 0x80000000 /* Start of user stack */
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#define BTOPUSRSTACK 0x80000 /* btop(USRSTACK) */
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#define LOWPAGES 0x00001
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#define HIGHPAGES 0
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/*
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* Virtual memory related constants, all in bytes
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*/
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#ifndef MAXTSIZ
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#define MAXTSIZ (24*1024*1024) /* max text size */
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#endif
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#ifndef DFLDSIZ
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#define DFLDSIZ (32*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (256*1024*1024) /* max data size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (1024*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ (32*1024*1024) /* max stack size */
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#endif
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/*
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* Sizes of the system and user portions of the system page table.
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*/
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/* SYSPTSIZE IS SILLY; (really number of buffers for I/O) */
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#define SYSPTSIZE 1228
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#define USRPTSIZE 1024
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/*
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* PTEs for mapping user space into the kernel for phyio operations.
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* 16 pte's are enough to cover 8 disks * MAXBSIZE.
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*/
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#ifndef USRIOSIZE
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#define USRIOSIZE 32
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#endif
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/*
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* PTEs for system V style shared memory.
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* This is basically slop for kmempt which we actually allocate (malloc) from.
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*/
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#ifndef SHMMAXPGS
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#define SHMMAXPGS 1024 /* 4mb */
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#endif
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/*
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* Boundary at which to place first MAPMEM segment if not explicitly
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* specified. Should be a power of two. This allows some slop for
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* the data segment to grow underneath the first mapped segment.
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*/
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#define MMSEG 0x200000
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/*
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* The size of the clock loop.
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*/
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#define LOOPPAGES (maxfree - firstfree)
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/*
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* The time for a process to be blocked before being very swappable.
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* This is a number of seconds which the system takes as being a non-trivial
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* amount of real time. You probably shouldn't change this;
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* it is used in subtle ways (fractions and multiples of it are, that is, like
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* half of a ``long time'', almost a long time, etc.)
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* It is related to human patience and other factors which don't really
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* change over time.
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*/
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#define MAXSLP 20
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/*
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* A swapped in process is given a small amount of core without being bothered
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* by the page replacement algorithm. Basically this says that if you are
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* swapped in you deserve some resources. We protect the last SAFERSS
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* pages against paging and will just swap you out rather than paging you.
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* Note that each process has at least UPAGES+CLSIZE pages which are not
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* paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
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* number just means a swapped in process is given around 25k bytes.
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* Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
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* so we loan each swapped in process memory worth 100$, or just admit
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* that we don't consider it worthwhile and swap it out to disk which costs
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* $30/mb or about $0.75.
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* Update: memory prices have changed recently (9/96). At the current
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* value of $6 per megabyte, we lend each swapped in process memory worth
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* $0.15, or just admit that we don't consider it worthwhile and swap it out
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* to disk which costs $0.20/MB, or just under half a cent.
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*/
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#define SAFERSS 4 /* nominal ``small'' resident set size
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protected against replacement */
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/*
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* DISKRPM is used to estimate the number of paging i/o operations
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* which one can expect from a single disk controller.
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*/
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#define DISKRPM 60
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/*
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* Klustering constants. Klustering is the gathering
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* of pages together for pagein/pageout, while clustering
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* is the treatment of hardware page size as though it were
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* larger than it really is.
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*
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* KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
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* units. Note that ctod(KLMAX*CLSIZE) must be <= DMMIN in dmap.h.
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* ctob(KLMAX) should also be less than MAXPHYS (in vm_swp.c)
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* unless you like "big push" panics.
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*/
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#ifdef notdef /* XXX */
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#define KLMAX (4/CLSIZE)
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#define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */
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#define KLIN (4/CLSIZE) /* default data/stack in klust */
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#define KLTXT (4/CLSIZE) /* default text in klust */
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#define KLOUT (4/CLSIZE)
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#else
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#define KLMAX (1/CLSIZE)
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#define KLSEQL (1/CLSIZE)
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#define KLIN (1/CLSIZE)
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#define KLTXT (1/CLSIZE)
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#define KLOUT (1/CLSIZE)
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#endif
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/*
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* KLSDIST is the advance or retard of the fifo reclaim for sequential
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* processes data space.
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*/
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#define KLSDIST 3 /* klusters advance/retard for seq. fifo */
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/*
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* Paging thresholds (see vm_sched.c).
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* Strategy of 1/19/85:
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* lotsfree is 512k bytes, but at most 1/4 of memory
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* desfree is 200k bytes, but at most 1/8 of memory
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*/
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#define LOTSFREE (512 * 1024)
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#define LOTSFREEFRACT 4
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#define DESFREE (200 * 1024)
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#define DESFREEFRACT 8
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/*
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* There are two clock hands, initially separated by HANDSPREAD bytes
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* (but at most all of user memory). The amount of time to reclaim
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* a page once the pageout process examines it increases with this
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* distance and decreases as the scan rate rises.
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*/
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#define HANDSPREAD (2 * 1024 * 1024)
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/*
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* The number of times per second to recompute the desired paging rate
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* and poke the pagedaemon.
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*/
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#define RATETOSCHEDPAGING 4
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/*
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* Believed threshold (in megabytes) for which interleaved
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* swapping area is desirable.
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*/
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#define LOTSOFMEM 2
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#define mapin(pte, v, pfnum, prot) \
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(*(int *)(pte) = ((pfnum) << PG_SHIFT) | (prot), MachTLBFlushAddr(v))
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/*
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* Mach derived constants
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*/
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/* user/kernel map constants */
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#define VM_MIN_ADDRESS ((vm_offset_t)0x00000000)
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#define VM_MAXUSER_ADDRESS ((vm_offset_t)0x80000000)
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#define VM_MAX_ADDRESS ((vm_offset_t)0x80000000)
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#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xC0000000)
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#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFFFFC000)
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/* virtual sizes (bytes) for various kernel submaps */
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#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
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#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)
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#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
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/* pcb base */
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#define pcbb(p) ((u_int)(p)->p_addr)
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