/*      $NetBSD: vmparam.h,v 1.22 2021/02/26 01:48:20 simonb Exp $      */

/*      $OpenBSD: vmparam.h,v 1.33 2006/06/04 17:21:24 miod Exp $       */

/*
 * Copyright (c) 1988-1994, The University of Utah and
 * the Computer Systems Laboratory at the University of Utah (CSL).
 * All rights reserved.
 *
 * Permission to use, copy, modify and distribute this software is hereby
 * granted provided that (1) source code retains these copyright, permission,
 * and disclaimer notices, and (2) redistributions including binaries
 * reproduce the notices in supporting documentation, and (3) all advertising
 * materials mentioning features or use of this software display the following
 * acknowledgement: ``This product includes software developed by the
 * Computer Systems Laboratory at the University of Utah.''
 *
 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
 * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * CSL requests users of this software to return to csl-dist@cs.utah.edu any
 * improvements that they make and grant CSL redistribution rights.
 *
 *      Utah $Hdr: vmparam.h 1.16 94/12/16$
 */

#ifndef _HPPA_VMPARAM_H_
#define _HPPA_VMPARAM_H_

#define __USE_TOPDOWN_VM

/*
 * Machine dependent constants for HP PA
 */

/*
 * We use 4K pages on the HP PA.  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)

/*
 * USRSTACK is the bottom (start) of the user stack.
 */
#define USRSTACK        (VM_MAXUSER_ADDRESS - MAXSSIZ) /* Start of user stack */
#define SYSCALLGATE     0xc0000000              /* syscall gateway page */

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ
#define MAXTSIZ         (1024*1024*1024)                /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ         (16*1024*1024)          /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ         (USRSTACK-MAXTSIZ)      /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ         (2*1024*1024)           /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ         (256*1024*1024)         /* max stack size */
#endif

#ifndef USRIOSIZE
#define USRIOSIZE       ((2*HPPA_PGALIAS)/PAGE_SIZE)    /* 2mb */
#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.
 */
/* XXXNH - remove??? */
#define MAXSLP          20

/* user/kernel map constants */
#define VM_MIN_ADDRESS          ((vaddr_t)0)
#define VM_MAXUSER_ADDRESS      ((vaddr_t)0xc0000000)
#define VM_MAX_ADDRESS          VM_MAXUSER_ADDRESS

#define VM_MIN_KERNEL_ADDRESS   ((vaddr_t)0xc0001000)
#define VM_MAX_KERNEL_ADDRESS   ((vaddr_t)0xef000000)

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

#define VM_PHYSSEG_MAX  8       /* this many physmem segments */
#define VM_PHYSSEG_STRAT        VM_PSTRAT_BIGFIRST

#define VM_NFREELIST            2
#define VM_FREELIST_DEFAULT     0
#define VM_FREELIST_ISADMA      1

#endif  /* _HPPA_VMPARAM_H_ */