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/* $OpenBSD: vmparam.h,v 1.12 1999/09/17 16:52:06 deraadt Exp $ */
/* $NetBSD: vmparam.h,v 1.15 1994/10/27 04:16:34 cgd Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vmparam.h 5.9 (Berkeley) 5/12/91
*/
#ifndef _MACHINE_VM_PARAM_H_
#define _MACHINE_VM_PARAM_H_
/*
* Machine dependent constants for 386.
*/
/*
* Virtual address space arrangement. On 386, both user and kernel
* share the address space, not unlike the vax.
* USRTEXT is the start of the user text/data space, while USRSTACK
* is the top (end) of the user stack. Immediately above the user stack
* resides the user structure, which is UPAGES long and contains the
* kernel stack.
*
* Immediately after the user structure is the page table map, and then
* kernal address space.
*/
#define USRTEXT CLBYTES
#define USRSTACK VM_MAXUSER_ADDRESS
/*
* Virtual memory related constants, all in bytes
*/
#define MAXTSIZ (64*1024*1024) /* max text size */
#ifndef DFLDSIZ
#define DFLDSIZ (32*1024*1024) /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ (1*1024*1024*1024) /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ (2*1024*1024) /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ (32*1024*1024) /* max stack size */
#endif
/*
* Default sizes of swap allocation chunks (see dmap.h).
* The actual values may be changed in vminit() based on MAXDSIZ.
* With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
*/
#define DMMIN 32 /* smallest swap allocation */
#define DMMAX 4096 /* largest potential swap allocation */
#define DMTEXT 1024 /* swap allocation for text */
/*
* Size of shared memory map
*/
#ifndef SHMMAXPGS
#define SHMMAXPGS 1024
#endif
/*
* Size of User Raw I/O map
*/
#define USRIOSIZE 300
/*
* The time for a process to be blocked before being very swappable.
* This is a number of seconds which the system takes as being a non-trivial
* amount of real time. You probably shouldn't change this;
* it is used in subtle ways (fractions and multiples of it are, that is, like
* half of a ``long time'', almost a long time, etc.)
* It is related to human patience and other factors which don't really
* change over time.
*/
#define MAXSLP 20
/*
* A swapped in process is given a small amount of core without being bothered
* by the page replacement algorithm. Basically this says that if you are
* swapped in you deserve some resources. We protect the last SAFERSS
* pages against paging and will just swap you out rather than paging you.
* Note that each process has at least UPAGES+CLSIZE pages which are not
* paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
* number just means a swapped in process is given around 25k bytes.
* Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
* so we loan each swapped in process memory worth 100$, or just admit
* that we don't consider it worthwhile and swap it out to disk which costs
* $30/mb or about $0.75.
* { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17
* on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) }
*/
#define SAFERSS 8 /* nominal ``small'' resident set size
protected against replacement */
/*
* Mach derived constants
*/
/* user/kernel map constants */
#define VM_MIN_ADDRESS ((vm_offset_t)0)
#define VM_MAXUSER_ADDRESS ((vm_offset_t)((PTDPTDI<<PDSHIFT) - USPACE))
#define VM_MAX_ADDRESS ((vm_offset_t)((PTDPTDI<<PDSHIFT) + (PTDPTDI<<PGSHIFT)))
#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE)
#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)(APTDPTDI<<PDSHIFT))
/* virtual sizes (bytes) for various kernel submaps */
#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)
#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
#define MACHINE_NEW_NONCONTIG /* VM <=> pmap interface modifier */
#define VM_PHYSSEG_MAX 4 /* actually we could have this many segments */
#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
#define VM_NFREELIST 2
#define VM_FREELIST_DEFAULT 0
#define VM_FREELIST_FIRST16 1
/*
* pmap specific data stored in the vm_physmem[] array
*/
#if defined(PMAP_NEW)
struct pmap_physseg {
struct pv_head *pvhead; /* pv_head array */
char *attrs; /* attrs array */
};
#else
struct pmap_physseg {
struct pv_entry *pvent; /* pv_entry array */
char *attrs; /* attrs array */
};
#endif
#endif /* _MACHINE_VM_PARAM_H_ */
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