text: /*	$OpenBSD: vmparam.h,v 1.25 2003/12/28 22:12:34 miod 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	0x80000000		/* Start of user stack */
  
  /*
   * 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		MAXDSIZ			/* max stack size */
  #endif
  
  /*
   * Size of shared memory map
   */
  #ifndef SHMMAXPGS
  #define SHMMAXPGS	1024
  #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
  
  #define	VM_MIN_ADDRESS		((vaddr_t) 0)
  #define	VM_MAX_ADDRESS		((vaddr_t) 0xffc00000)
  #define VM_MAXUSER_ADDRESS	VM_MAX_ADDRESS
  
  /* on vme188, max = 0xf0000000 */
  
  #define VM_MIN_KERNEL_ADDRESS	((vaddr_t) 0)
  #define VM_MAX_KERNEL_ADDRESS	((vaddr_t) 0x20000000)
  
  #define KERNEL_STACK_SIZE	(3 * PAGE_SIZE)	/* kernel stack size */
  #define INTSTACK_SIZE		(4 * PAGE_SIZE)	/* interrupt stack size */
  
  /* 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.
   * The mvme88k only has one physical memory segment.
   */
  #define	VM_PHYSSEG_MAX		1
  #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
  #define	VM_PHYSSEG_NOADD
  
  #define VM_NFREELIST		1
  #define VM_FREELIST_DEFAULT	0
  
  #ifndef _LOCORE
  /*
   * pmap-specific data stored in the vm_physmem[] array.
   */
  
  /* XXX - belongs in pmap.h, but put here because of ordering issues */
  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 */
  	int		pv_flags;
  };
  
  #define	__HAVE_VM_PAGE_MD
  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 = PMAP_NULL;	\
  	(pg)->mdpage.pvent.pv_va = 0;		\
  	(pg)->mdpage.pvent.pv_flags = 0;	\
  } while (0)
  
  #endif /* _LOCORE */
  
  #endif /* _MACHINE_VM_PARAM_ */
  