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Initial revision

/*	$OpenBSD: vmparam.h,v 1.16 2007/04/21 13:43:38 art Exp $	*/
/*	$NetBSD: vmparam.h,v 1.18 2001/05/01 02:19:19 thorpej Exp $ */

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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, Lawrence Berkeley Laboratory.
 *
 * 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. 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	8.1 (Berkeley) 6/11/93
 */

/*
 * Machine dependent constants for Sun-4c SPARC
 */

#ifndef VMPARAM_H
#define VMPARAM_H

/*
 * USRTEXT is the start of the user text/data space, while USRSTACK
 * is the top (end) of the user stack.
 */
#define	USRTEXT		0x2000			/* Start of user text */
#define USRSTACK	0xffffffffffffe000L

/*
 * Virtual memory related constants, all in bytes
 */
/* #ifdef __arch64__ */
#if 0
/*
 * 64-bit limits:
 *
 * Since the compiler generates `call' instructions we can't
 * have more than 4GB in a single text segment.
 *
 * And since we only have a 40-bit adderss space, allow half
 * of that for data and the other half for stack.
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(4L*1024*1024*1024)	/* max text size */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(128L*1024*1024)	/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(512L*1024*1024*1024)	/* max data size */
#endif
#ifndef	DFLSSIZ
#define	DFLSSIZ		(1024*1024)		/* initial stack size limit */
#endif
#ifndef	MAXSSIZ
#define	MAXSSIZ		MAXDSIZ			/* max stack size */
#endif
#else
/*
 * 32-bit limits:
 *
 * We only have 4GB to play with.  Limit stack, data, and text
 * each to half of that.
 *
 * This is silly.  Apparently if we go above these numbers
 * integer overflows in other parts of the kernel cause hangs.
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(1*1024*1024*1024)	/* max text size */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(128*1024*1024)		/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(1*1024*1024*1024)	/* max data size */
#endif
#ifndef	DFLSSIZ
#define	DFLSSIZ		(1024*1024)		/* initial stack size limit */
#endif
#ifndef	MAXSSIZ
#define	MAXSSIZ		(8*1024*1024)			/* max stack size */
#endif
#endif

#define STACKGAP_RANDOM	256*1024

/*
 * Size of shared memory map
 */
#ifndef SHMMAXPGS
#define SHMMAXPGS	4096			/* 32mb */
#endif

/*
 * Mach derived constants
 */

/*
 * User/kernel map constants.
 */
#define VM_MIN_ADDRESS		((vaddr_t)0)
#define VM_MAX_ADDRESS		((vaddr_t)-1)
#define VM_MAXUSER_ADDRESS	((vaddr_t)-1)

#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)KERNBASE)
#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0x000007ffffffffffL)

#define VM_PHYSSEG_MAX          32       /* up to 32 segments */
#define VM_PHYSSEG_STRAT        VM_PSTRAT_BSEARCH
#define VM_PHYSSEG_NOADD                /* can't add RAM after vm_mem_init */

#define	VM_NFREELIST		1
#define	VM_FREELIST_DEFAULT	0

#define __HAVE_VM_PAGE_MD
/*
 * For each struct vm_page, there is a list of all currently valid virtual
 * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
 *
 * XXX - this doesn't belong here, but for now we have to keep it here
 *       because of include ordering issues.
 */
typedef struct pv_entry {
	struct pv_entry	*pv_next;	/* next pv_entry */
	struct pmap	*pv_pmap;	/* pmap where mapping lies */
	vaddr_t	pv_va;		/* virtual address for mapping */
} *pv_entry_t;
/* PV flags encoded in the low bits of the VA of the first pv_entry */

struct vm_page_md {
	struct pv_entry pvent;
};

#define VM_MDPAGE_INIT(pg) do {			\
	(pg)->mdpage.pvent.pv_next = NULL;	\
	(pg)->mdpage.pvent.pv_pmap = NULL;	\
	(pg)->mdpage.pvent.pv_va = 0;		\
} while (0)

#if defined (_KERNEL) && !defined(_LOCORE)
struct vm_map;
vaddr_t		dvma_mapin(struct vm_map *, vaddr_t, int, int);
void		dvma_mapout(vaddr_t, vaddr_t, int);
#endif
#endif