/*	$OpenBSD: vmparam.h,v 1.11 2001/03/22 23:50:53 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 _MACHINE_VMPARAM_H_
#define _MACHINE_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		2
#define	LOWPAGES	0
#define	HIGHPAGES	UPAGES
#define	SYSCALLGATE	0xC0000000		/* syscall gateway page */

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(0x40000000)		/* max text size */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(16*1024*1024)		/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(USRSTACK-MAXTSIZ)	/* max data size */
#endif
#ifndef	DFLSSIZ
#define	DFLSSIZ		(512*1024)		/* initial stack size limit */
#endif
#ifndef	MAXSSIZ
#define	MAXSSIZ		(UADDR-USRSTACK)	/* 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	32			/* smallest swap allocation */
#define	DMMAX	4096			/* largest potential swap allocation */

#ifndef USRIOSIZE
#define	USRIOSIZE	((2*HPPA_PGALIAS)/CLBYTES)	/* 2mb */
#endif

/*
 * 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		(0x4000/NBPG)	/* nominal ``small'' resident set size
					   protected against replacement */

/* user/kernel map constants */
#define	VM_MIN_ADDRESS		((vaddr_t)0)
#define	VM_MAXUSER_ADDRESS	((vaddr_t)0xc0000000)
#define	VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
#define	VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
#define	VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xf0000000)

/* 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	VM_PHYSSEG_MAX	8	/* this many physmem segments */
#define	VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST

#define	VM_PHYSSEG_NOADD	/* XXX until uvm code is fixed */

#define	VM_NFREELIST		2
#define	VM_FREELIST_DEFAULT	0
#define	VM_FREELIST_FIRST16	1

#define	MACHINE_NEW_NONCONTIG	1	/* defined this until we rely on vm */
#define	PMAP_NEW

#ifdef _KERNEL
struct pmap_physseg {
	struct pv_entry *pvent;
};
#endif

#endif	/* _MACHINE_VMPARAM_H_ */