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/* $OpenBSD: vmparam.h,v 1.3 1998/08/29 01:20:38 mickey Exp $ */
/*
* Copyright (c) 1988-1994, The University of Utah and
* the Computer Systems Laboratory at the University of Utah (CSL).
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software is hereby
* granted provided that (1) source code retains these copyright, permission,
* and disclaimer notices, and (2) redistributions including binaries
* reproduce the notices in supporting documentation, and (3) all advertising
* materials mentioning features or use of this software display the following
* acknowledgement: ``This product includes software developed by the
* Computer Systems Laboratory at the University of Utah.''
*
* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* CSL requests users of this software to return to csl-dist@cs.utah.edu any
* improvements that they make and grant CSL redistribution rights.
*
* Utah $Hdr: vmparam.h 1.16 94/12/16$
*/
#ifndef _HPPA_VMPARAM_H_
#define _HPPA_VMPARAM_H_
/*
* Machine dependent constants for HP PA
*/
/*
* USRTEXT is the start of the user text/data space, while USRSTACK
* is the top (end) of the user stack. LOWPAGES and HIGHPAGES are
* the number of pages from the beginning of the P0 region to the
* beginning of the text and from the beginning of the P1 region to the
* beginning of the stack respectively.
*/
#define USRTEXT 0x00002000 /* Start of user .text */
#define USRSTACK 0x68FF3000 /* Start of user stack */
#define BTOPUSRSTACK btop(USRSTACK) /* btop(USRSTACK) */
#define P1PAGES 0
#define LOWPAGES 0
#define HIGHPAGES UPAGES
#define SYSCALLGATE 0xC0000000 /* syscall gateway page */
#define INTSTACK_SIZE (5 * NBPG) /* interrupt stack size */
/*
* Virtual memory related constants, all in bytes
*/
#ifndef MAXTSIZ
#define MAXTSIZ (64*1024*1024) /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ (16*1024*1024) /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ (64*1024*1024) /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ (512*1024) /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ MAXDSIZ /* 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 64Mb and NDMAP of 62, dmmax will be 4096.
* DMMIN should be at least ctod(1) so that vtod() works.
* vminit() ensures this.
*/
#define DMMIN 64 /* smallest swap allocation */
#define DMMAX 4096 /* largest potential swap allocation */
#define DMTEXT 4096 /* swap allocation for text */
/*
* Sizes of the system and user portions of the system page table.
*/
/* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
#define SYSPTSIZE ((1024*1024*64)/NBPG) /* 64mb */
#define USRPTSIZE (8 * NPTEPG) /* 32mb */
/*
* PTEs for system V style shared memory.
* This is basically slop for kmempt which we actually allocate (malloc) from.
*/
#ifndef SHMMAXPGS
#define SHMMAXPGS ((1024*1024*10)/NBPG) /* 10mb */
#endif
/*
* The size of the clock loop.
*/
#define LOOPPAGES (maxfree - firstfree)
/*
* 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.
*/
#define SAFERSS (16384/NBPG) /* nominal ``small'' resident set size
protected against replacement */
/* user/kernel map constants */
#define VM_MIN_ADDRESS ((vm_offset_t)0)
#define VM_MAXUSER_ADDRESS ((vm_offset_t)0xc0000000)
#define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS
#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0)
#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFFFF0000)
/* 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 8 /* this many physmem segments */
#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
#endif /* _HPPA_VMPARAM_H_ */
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