NetBSD/sys/arch/mips/include/vmparam.h

/*	$NetBSD: vmparam.h,v 1.18 2000/01/09 20:08:14 simonb Exp $	*/

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department and Ralph Campbell.
 *
 * 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.
 *
 * from: Utah Hdr: vmparam.h 1.16 91/01/18
 *
 *	@(#)vmparam.h	8.2 (Berkeley) 4/22/94
 */

#ifndef _MIPS_VMPARAM_H_
#define	_MIPS_VMPARAM_H_

/*
 * Machine dependent VM constants for MIPS.
 */

/*
 * USRTEXT is the start of the user text/data space, while USRSTACK
 * is the top (end) of the user stack.
 */
#define	USRTEXT		0x00001000	/* Start of user text */
#define	USRSTACK	0x80000000	/* Start of user stack */

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(24*1024*1024)		/* max text size */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(32*1024*1024)		/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(256*1024*1024)		/* max data size */
#endif
#ifndef	DFLSSIZ
#define	DFLSSIZ		(1024*1024)		/* initial stack size limit */
#endif
#ifndef	MAXSSIZ
#define	MAXSSIZ		(32*1024*1024)		/* max stack size */
#endif

/*
 * PTEs for mapping user space into the kernel for phyio operations.
 * 16 pte's are enough to cover 8 disks * MAXBSIZE.
 */
#ifndef USRIOSIZE
#define USRIOSIZE	32
#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		/* 4mb */
#endif

/*
 * 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 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.
 * Update: memory prices have changed recently (9/96). At the current
 * value of $6 per megabyte, we lend each swapped in process memory worth
 * $0.15, or just admit that we don't consider it worthwhile and swap it out
 * to disk which costs $0.20/MB, or just under half a cent.
 */
#define	SAFERSS		4		/* nominal ``small'' resident set size
					   protected against replacement */

#define	mapin(pte, v, pfnum, prot) \
	(*(int *)(pte) = ((pfnum) << PG_SHIFT) | (prot), MachTLBFlushAddr(v))

/*
 * Mach derived constants
 */

/* user/kernel map constants */
#define VM_MIN_ADDRESS		((vaddr_t)0x00000000)
#define VM_MAXUSER_ADDRESS	((vaddr_t)0x80000000)
#define VM_MAX_ADDRESS		((vaddr_t)0x80000000)
#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0xC0000000)
#ifdef ENABLE_MIPS_TX3900
#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFF000000)
#else
#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFFFFC000)
#endif

/* virtual sizes (bytes) for various kernel submaps */
#define VM_KMEM_SIZE		(NKMEMCLUSTERS*NBPG)
#define VM_PHYS_SIZE		(USRIOSIZE*NBPG)

/* VM_PHYSSEG_MAX defined by platform-dependent code. */
#define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
#define	VM_PHYSSEG_NOADD	/* can add RAM after vm_mem_init */

/*
 * pmap-specific data stored in the vm_physmem[] array.
 */
struct pmap_physseg {
	struct pv_entry *pvent;		/* pv table for this seg */
	char *attrs;			/* page attributes for this seg */
};

#endif /* ! _MIPS_VMPARAM_H_ */