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      1 /*	$NetBSD: vmparam.h,v 1.31 2025/02/08 23:44:53 tsutsui Exp $	*/
      2 
      3 /*
      4  * This file was taken from mvme68k/include/vmparam.h and
      5  * should probably be re-synced when needed.
      6  * Darrin B Jewell <jewell (at) mit.edu>  Fri Aug 28 03:22:07 1998
      7  * original cvs id: NetBSD: vmparam.h,v 1.9 1998/08/22 10:55:34 scw Exp
      8  */
      9 
     10 /*
     11  * Copyright (c) 1988 University of Utah.
     12  * Copyright (c) 1982, 1986, 1990, 1993
     13  *	The Regents of the University of California.  All rights reserved.
     14  *
     15  * This code is derived from software contributed to Berkeley by
     16  * the Systems Programming Group of the University of Utah Computer
     17  * Science Department.
     18  *
     19  * Redistribution and use in source and binary forms, with or without
     20  * modification, are permitted provided that the following conditions
     21  * are met:
     22  * 1. Redistributions of source code must retain the above copyright
     23  *    notice, this list of conditions and the following disclaimer.
     24  * 2. Redistributions in binary form must reproduce the above copyright
     25  *    notice, this list of conditions and the following disclaimer in the
     26  *    documentation and/or other materials provided with the distribution.
     27  * 3. Neither the name of the University nor the names of its contributors
     28  *    may be used to endorse or promote products derived from this software
     29  *    without specific prior written permission.
     30  *
     31  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     34  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     35  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     39  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     40  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     41  * SUCH DAMAGE.
     42  *
     43  * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
     44  *
     45  *	@(#)vmparam.h	8.2 (Berkeley) 4/19/94
     46  */
     47 
     48 #ifndef _NEXT68K_VMPARAM_H_
     49 #define _NEXT68K_VMPARAM_H_
     50 
     51 /*
     52  * Machine dependent constants for NEXT68K
     53  */
     54 
     55 /*
     56  * Use common m68k definitions to define PAGE_SIZE and related constants.
     57  */
     58 #include <m68k/vmparam.h>
     59 
     60 /*
     61  * USRSTACK is the top (end) of the user stack.
     62  */
     63 #define	USRSTACK	VM_MAXUSER_ADDRESS	/* Start of user stack */
     64 
     65 /*
     66  * Virtual memory related constants, all in bytes
     67  */
     68 #ifndef MAXTSIZ
     69 #define	MAXTSIZ		(32*1024*1024)		/* max text size */
     70 #endif
     71 #ifndef DFLDSIZ
     72 #define	DFLDSIZ		(16*1024*1024)		/* initial data size limit */
     73 #endif
     74 #ifndef MAXDSIZ
     75 #define	MAXDSIZ		(64*1024*1024)		/* max data size */
     76 #endif
     77 #ifndef	DFLSSIZ
     78 #define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
     79 #endif
     80 #ifndef	MAXSSIZ
     81 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
     82 #endif
     83 
     84 /*
     85  * PTEs for mapping user space into the kernel for phyio operations.
     86  * One page is enough to handle 4Mb of simultaneous raw IO operations.
     87  */
     88 #ifndef USRIOSIZE
     89 #define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
     90 #endif
     91 
     92 /*
     93  * Mach derived constants
     94  */
     95 
     96 /* user/kernel map constants */
     97 #define VM_MIN_ADDRESS		((vaddr_t)0)
     98 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFF00000)
     99 #define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
    100 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
    101 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0-PAGE_SIZE*NPTEPG))
    102 
    103 /* virtual sizes (bytes) for various kernel submaps */
    104 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    105 
    106 /* # of kernel PT pages (initial only, can grow dynamically) */
    107 #define VM_KERNEL_PT_PAGES	((vsize_t)2)
    108 
    109 /*
    110  * Constants which control the way the VM system deals with memory segments.
    111  */
    112 #define	VM_PHYSSEG_MAX		5			/* @@@ should really come from N_SIMM */
    113 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_RANDOM
    114 #define	VM_NFREELIST		1
    115 #define	VM_FREELIST_DEFAULT	0
    116 
    117 #define	__HAVE_PMAP_PHYSSEG
    118 
    119 /*
    120  * pmap-specific data stored in the vm_physmem[] array.
    121  */
    122 struct pmap_physseg {
    123 	struct pv_header *pvheader;	/* pv table for this seg */
    124 };
    125 
    126 #endif /* _NEXT68K_VMPARAM_H_ */
    127