d42d25c451
Mark the fact that PGSHIFT and PDRSHIFT are really the same as PG_SHIFT and PD_SHIFT, these should be collapsed some day soon. Document that KERNBASE should really be KPTDPTDI << PDRSHIFT, for now leave it as the constant 0xFE000000 until I make a seperate common header file for this stuff (vmaddresses.h?) Remove NKMEMCLUSTERS define, it was only being used to define VM_KMEM_SIZE, so why have all the indirection. Besides who wants to work in CLBYTE sizes chuncks. pmap.h: Fix $Id$ and some other minor format clean ups. Remove the XXX comment about NKPDE, since it now has the correct value of 7. Remove unused LASTPTDI and move the APTD into the very end of memory to free up 4MB of kernel virtual address space. Remove unused RSVDPTDI and free up 12MB of kernel virtual address space. vmparam.h Fix $Id$. Increase SHMMAXPGS to 512 (2MB) now that there is room for it to be bigger. The XXX comment stays until the kernel moves down in memory to free up enough space to use the proper default of 4MB. VM_KMEM_SIZE is now a direct constant stating the size of the kernel malloc region. Increased the value from 3MB to 16MB.
262 lines
8.3 KiB
C
262 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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* from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
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* $Id$
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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 (8*1024*1024) /* 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 the Shared Memory Pages page table.
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*/
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#ifndef SHMMAXPGS
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#define SHMMAXPGS 512 /* XXX until we have more kmap space */
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#endif
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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 (16 * 1024 * 1024)
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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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/*
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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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