mac68k/include/vmparam.h

/*	$NetBSD: vmparam.h,v 1.30 2001/05/01 02:19:16 thorpej Exp $	*/

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 1990 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.
 *
 * 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.
 */
/*-
 * Copyright (C) 1993	Allen K. Briggs, Chris P. Caputo,
 *			Michael L. Finch, Bradley A. Grantham, and
 *			Lawrence A. Kesteloot
 * All rights reserved.
 *
 * 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 Alice Group.
 * 4. The names of the Alice Group or any of its members may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE ALICE GROUP ``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 ALICE GROUP 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	7.3 (Berkeley) 5/7/91
 */

#ifndef _MAC68K_VMPARAM_H_
#define	_MAC68K_VMPARAM_H_

/*
 * Machine dependent constants for mac68k -- mostly derived from hp300.
 */

/*
 * We use 4K pages on the mac68k.  Override the PAGE_* definitions
 * to be compile-time constants.
 */
#define	PAGE_SHIFT	12
#define	PAGE_SIZE	(1 << PAGE_SHIFT)
#define	PAGE_MASK	(PAGE_SIZE - 1)

/*
 * 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.
 *
 * NOTE: HP300 uses HIGHPAGES == (0x100000/NBPG) for HP/UX compatibility.
 * Do we care?  Obviously not at the moment.
 */
#define	USRTEXT		8192
#define	USRSTACK	(-HIGHPAGES*NBPG)	/* Start of user stack */
#define	BTOPUSRSTACK	(0x100000-HIGHPAGES)	/* btop(USRSTACK) */
#define P1PAGES		0x100000
#define	LOWPAGES	0
#define HIGHPAGES	3			/* UPAGES */

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(8*1024*1024)		/* max text size */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(32*1024*1024)		/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(64*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

/*
 * Sizes of the system and user portions of the system page table.
 */
/* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
#define	SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
#define	USRPTSIZE 	(1 * NPTEPG)	/* 4mb */

/*
 * PTEs for mapping user space into the kernel for phyio operations.
 * One page is enough to handle 4Mb of simultaneous raw IO operations.
 */
#ifndef USRIOSIZE
#define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
#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

/*
 * Mach derived constants
 */

/* user/kernel map constants */
#define VM_MIN_ADDRESS		((vaddr_t)0)
#define VM_MAXUSER_ADDRESS	((vaddr_t)(USRSTACK))
#define VM_MAX_ADDRESS		((vaddr_t)(0-(UPAGES*NBPG)))
#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0-NBPG))

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

/* # of kernel PT pages (initial only, can grow dynamically) */
#define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */

/*
 * Constants which control the way the VM system deals with memory segments.
 * Most mac68k systems have only 1 physical memory segment, but some have 2.
 *
 * On the systems that have multiple segments, specifically the IIsi and
 * IIci, the optimal configuration is to put the higher-density SIMMs in
 * bank B.  This is because the on-board video uses main memory in bank A
 * for the framebuffer, and a memory controller prevents access during
 * video refresh cycles.  Even if both banks contain the same amount of
 * RAM, a minimum of ~320KB will be subtracted from the amount in bank A
 * for the framebuffer (if on-board video is in use).
 */
#define	VM_PHYSSEG_MAX		2
#define	VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
#define	VM_PHYSSEG_NOADD

#define	VM_NFREELIST		1
#define	VM_FREELIST_DEFAULT	0

#define	__HAVE_PMAP_PHYSSEG

/*
 * 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 /* _MAC68K_VMPARAM_H_ */