257 lines
8.3 KiB
C
257 lines
8.3 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* 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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* William Jolitz.
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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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* @(#)vmparam.h 5.9 (Berkeley) 5/12/91
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*/
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/*
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* Machine dependent constants for 386.
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*/
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/*
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* Virtual address space arrangement. On 386, both user and kernel
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* share the address space, not unlike the vax.
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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. Immediately above the user stack
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* resides the user structure, which is UPAGES long and contains the
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* kernel stack.
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*
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* Immediately after the user structure is the page table map, and then
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* kernal address space.
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*/
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#define USRTEXT 0
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#define USRSTACK 0xFDBFE000
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#define BTOPUSRSTACK (0xFDC00-(UPAGES)) /* btop(USRSTACK) */
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#define LOWPAGES 0
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#define HIGHPAGES UPAGES
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/*
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* Virtual memory related constants, all in bytes
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*/
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#define MAXTSIZ (6*1024*1024) /* max text size */
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#ifndef DFLDSIZ
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#define DFLDSIZ (16*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (32*1024*1024) /* max data size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (512*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ MAXDSIZ /* max stack size */
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#endif
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/*
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* Default sizes of swap allocation chunks (see dmap.h).
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* The actual values may be changed in vminit() based on MAXDSIZ.
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* With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
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*/
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#define DMMIN 32 /* smallest swap allocation */
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#define DMMAX 4096 /* largest potential swap allocation */
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#define DMTEXT 1024 /* swap allocation for text */
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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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#define SYSPTSIZE (2*NPTEPG)
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#define USRPTSIZE (2*NPTEPG)
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/*
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* Size of User Raw I/O map
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*/
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#define USRIOSIZE 300
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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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* { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17
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* on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) }
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*/
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#define SAFERSS 8 /* 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 KLMAX*CLSIZE must be <= DMMIN in dmap.h.
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*/
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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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/*
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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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* minfree is 64k bytes, but at most 1/2 of desfree
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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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#define MINFREE (64 * 1024)
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#define MINFREEFRACT 2
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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)<<PGSHIFT) | (prot)) ; }
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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)0)
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#define VM_MAXUSER_ADDRESS ((vm_offset_t)0xFDBFE000)
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#define UPT_MIN_ADDRESS ((vm_offset_t)0xFDC00000)
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#define UPT_MAX_ADDRESS ((vm_offset_t)0xFDFF7000)
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#define VM_MAX_ADDRESS UPT_MAX_ADDRESS
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#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xFDFF7000)
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#define UPDT VM_MIN_KERNEL_ADDRESS
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#define KPT_MIN_ADDRESS ((vm_offset_t)0xFDFF8000)
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#define KPT_MAX_ADDRESS ((vm_offset_t)0xFDFFF000)
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#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFF7FF000)
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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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/* # of kernel PT pages (initial only, can grow dynamically) */
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#define VM_KERNEL_PT_PAGES ((vm_size_t)2) /* XXX: SYSPTSIZE */
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/* pcb base */
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#define pcbb(p) ((u_int)(p)->p_addr)
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/*
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* Flush MMU TLB
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*/
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#ifndef I386_CR3PAT
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#define I386_CR3PAT 0x0
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#endif
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#ifdef notyet
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#define _cr3() ({u_long rtn; \
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asm (" movl %%cr3,%%eax; movl %%eax,%0 " \
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: "=g" (rtn) \
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: \
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: "ax"); \
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rtn; \
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})
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#define load_cr3(s) ({ u_long val; \
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val = (s) | I386_CR3PAT; \
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asm ("movl %0,%%eax; movl %%eax,%%cr3" \
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: \
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: "g" (val) \
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: "ax"); \
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})
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#define tlbflush() ({ u_long val; \
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val = u.u_pcb.pcb_ptd | I386_CR3PAT; \
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asm ("movl %0,%%eax; movl %%eax,%%cr3" \
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: \
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: "g" (val) \
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: "ax"); \
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})
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#endif
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