177 lines
6.2 KiB
C
177 lines
6.2 KiB
C
/* $NetBSD: vmparam.h,v 1.31 1999/04/26 22:46:46 thorpej Exp $ */
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/*-
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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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#ifndef _VMPARAM_H_
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#define _VMPARAM_H_
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#if defined(_KERNEL) && !defined(_LKM)
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#include "opt_pmap_new.h"
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#endif
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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 CLBYTES
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#define USRSTACK VM_MAXUSER_ADDRESS
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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 (64*1024*1024) /* max text size */
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#ifndef DFLDSIZ
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#define DFLDSIZ (128*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (1*1024*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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* Size of shared memory map
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*/
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#ifndef SHMMAXPGS
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#define SHMMAXPGS 1024
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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 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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* 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 8 /* nominal ``small'' resident set size
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protected against replacement */
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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 ((vaddr_t)0)
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/* PTDPTDI<<PDSHIFT - UPAGES*NBPG */
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#define VM_MAXUSER_ADDRESS ((vaddr_t)0xefbfe000)
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/* PTDPTDI<<PDSHIFT + PTDPTDI<<PGSHIFT */
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#define VM_MAX_ADDRESS ((vaddr_t)0xeffbf000)
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/* KPTDI<<PDSHIFT */
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#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0xf0000000)
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/* APTDPTDI<<PDSHIFT */
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#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0xffc00000)
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/* XXX max. amount of KVM to be used by buffers. */
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#ifndef VM_MAX_KERNEL_BUF
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#define VM_MAX_KERNEL_BUF \
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((VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) * 7 / 10)
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#endif
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/* virtual sizes (bytes) for various kernel submaps */
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#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)
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#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
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#define VM_PHYSSEG_MAX 3 /* 1 "hole" + 2 free lists */
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#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
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#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
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#define VM_NFREELIST 2
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#define VM_FREELIST_DEFAULT 0
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#define VM_FREELIST_FIRST16 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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#if defined(PMAP_NEW)
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struct pmap_physseg {
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struct pv_head *pvhead; /* pv_head array */
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char *attrs; /* attrs array */
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};
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#else
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struct pmap_physseg {
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struct pv_entry *pvent; /* pv_entry array */
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char *attrs; /* attrs array */
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};
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#endif
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#endif /* _VMPARAM_H_ */
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