192 lines
7.0 KiB
C
192 lines
7.0 KiB
C
/* $NetBSD: vmparam.h,v 1.20 1998/10/02 19:29:49 is Exp $ */
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/*
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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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*
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* @(#)vmparam.h 7.3 (Berkeley) 5/7/91
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*/
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#ifndef _MACHINE_VMPARAM_H_
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#define _MACHINE_VMPARAM_H_
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#include <machine/pte.h>
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/*
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* Machine dependent constants for HP300
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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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* These are a mixture of i386, sun3 and hp settings..
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*/
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/* Sun settings. Still hope, that I might get sun3 binaries to work... */
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#define USRTEXT 0x2000
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#ifndef USRSTACK
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#define USRSTACK 0x0E000000
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#endif
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#define LOWPAGES btoc(USRTEXT)
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#define KUSER_AREA (-UPAGES*NBPG)
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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 (6*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 (128*1024*1024) /* max data size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (2*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; IT SHOULD BE COMPUTED AT BOOT TIME */
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#define SYSPTSIZE (2 * NPTEPG) /* 16mb */
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#define USRPTSIZE (1 * NPTEPG) /* 16mb */
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/*
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* PTEs for mapping user space into the kernel for phyio operations.
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* One page is enough to handle 16Mb of simultaneous raw IO operations.
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*/
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#ifndef USRIOSIZE
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#define USRIOSIZE (1 * NPTEPG) /* 16mb */
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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 (1 * NPTEPG) /* 16mb */
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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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* 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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* user/kernel map constants
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*/
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#define VM_MIN_ADDRESS ((vm_offset_t)0) /* user min */
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#define VM_MAX_ADDRESS ((vm_offset_t)(USRSTACK)) /* user max */
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#define VM_MAXUSER_ADDRESS ((vm_offset_t)(VM_MAX_ADDRESS)) /* same */
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#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0)
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#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)(0-NBPG))
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/*
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* virtual sizes (bytes) for various kernel submaps
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*/
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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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/*
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* Our bootloader currently passes up to 16 segments (but this is variable)
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* Normally, the biggest of them is used for the kernel, and the kernel
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* segment is given to VM first.
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*/
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#define VM_PHYSSEG_MAX (16)
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#define VM_PHYSSEG_STRAT VM_PSTRAT_RANDOM
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#define VM_PHYSSEG_NOADD /* XXX this should be done right later */
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/*
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* Allow supporting Zorro-II memory as lower priority:
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*
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* - DEFAULT for Zorro-III memory (presumably 32 bit)
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* - ZORROII for Zorro-II memory (16 bit, Zorro-II DMA)
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*/
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#define VM_NFREELIST 2
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#define VM_FREELIST_DEFAULT 0
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#define VM_FREELIST_ZORROII 1
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/*
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* pmap-specific data stored in the vm_physmem[] array.
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*/
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struct pmap_physseg {
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struct pv_entry *pvent; /* pv table for this seg */
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char *attrs; /* page attributes for this seg */
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};
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/*
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* number of kernel PT pages (initial only, can grow dynamically)
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*/
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#define VM_KERNEL_PT_PAGES ((vm_size_t)4) /* XXX: SYSPTSIZE */
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#endif /* !_MACHINE_VMPARAM_H_ */
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