162 lines
6.3 KiB
C
162 lines
6.3 KiB
C
/* $NetBSD: vmparam3.h,v 1.14 1995/09/26 04:02:10 gwr Exp $ */
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/*
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* Copyright (c) 1994 Gordon W. Ross
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* Copyright (c) 1993 Adam Glass
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1982, 1986, 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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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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* from: @(#)vmparam.h 7.3 (Berkeley) 5/7/91
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* vmparam.h,v 1.2 1993/05/22 07:58:38 cgd Exp
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*/
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/*
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* Machine dependent constants for Sun3
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*
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* The Sun3 has limited total kernel virtual space (32MB) and
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* can not use main memory for page tables. (All active PTEs
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* must be installed in special translation RAM in the MMU).
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* Therefore, parameters that would normally configure the
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* size of various page tables are irrelevant. Only things
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* that consume portions of kernel virtual (KV) space matter,
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* and those things should be chosen to conserve KV space.
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*/
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/*
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* USRTEXT is the start of the user text/data space, while
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* USRSTACK is the top (end) of the user stack.
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*/
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#define USRTEXT NBPG /* Start of user text */
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#define USRSTACK KERNBASE /* High end of user stack */
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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 (8*1024*1024) /* max text size */
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#endif
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#ifndef DFLDSIZ
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#define DFLDSIZ (8*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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* DMMIN should be at least ctod(1) so that vtod() works.
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* vminit() insures this.
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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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/*
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* PTEs for mapping user space into the kernel for phyio operations.
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* The actual limitation for physio requests will be the DVMA space,
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* and that is fixed by hardware design at 1MB. We could make the
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* physio map larger than that, but it would not buy us much.
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*/
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#ifndef USRIOSIZE
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#define USRIOSIZE 128 /* 1 MB */
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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 512 /* 4 MB */
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#endif
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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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*/
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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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* Mach-derived constants, virtual memory map:
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*
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* 0000.0000 user space
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* 0E00.0000 kernel space
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* 0FE0.0000 monitor map (devices)
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* 0FF0.0000 DVMA space
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* 0FFE.0000 monitor RAM seg.
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* 0FFF.E000 monitor RAM page
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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_MAX_ADDRESS ((vm_offset_t)KERNBASE)
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#define VM_MAXUSER_ADDRESS ((vm_offset_t)KERNBASE)
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#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE)
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#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0x0FE00000)
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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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