/*	$OpenBSD: vmparam.h,v 1.19 2015/02/10 10:02:55 tedu Exp $ */
/*
 * Mach Operating System
 * Copyright (c) 1992 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

/*
 *	machine dependent virtual memory parameters.
 */


#ifndef	_MACHINE_VM_PARAM_
#define _MACHINE_VM_PARAM_

/*
 * USRTEXT is the start of the user text/data space, while USRSTACK
 * is the top (end) of the user stack.
 */
#define	USRTEXT		0x1000			/* Start of user text */
#define	USRSTACK	VM_MAXUSER_ADDRESS	/* Start of user stack */

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(32*1024*1024)		/* max text size */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(64*1024*1024)		/* initial data size limit */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(256*1024*1024)		/* max data size */
#endif
#ifndef BRKSIZ
#define	BRKSIZ		MAXDSIZ			/* heap gap 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

#define STACKGAP_RANDOM	256*1024

/*
 * Size of shared memory map
 */
#ifndef SHMMAXPGS
#define SHMMAXPGS	1024
#endif

#define	VM_MIN_ADDRESS		((vaddr_t)PAGE_SIZE)
#define	VM_MAX_ADDRESS		((vaddr_t)0xfffff000)
#define VM_MAXUSER_ADDRESS	VM_MAX_ADDRESS

/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE		(1 * NPTEPG * PAGE_SIZE)

/*
 * Constants which control the way the VM system deals with memory segments.
 * All m88k systems so far only have one physical memory segment.
 */
#define	VM_PHYSSEG_MAX		1
#define	VM_PHYSSEG_STRAT	VM_PSTRAT_RANDOM
#define	VM_PHYSSEG_NOADD

#endif /* _MACHINE_VM_PARAM_ */