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vmparam.h revision 1.23 
      1 /*	$NetBSD: vmparam.h,v 1.23 2011/02/08 20:20:21 rmind Exp $	*/
      2 
      3 /*
      4  * This file was taken from 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  * We use 4K pages on the NeXT.  Override the PAGE_* definitions
     57  * to be compile-time constants.
     58  */
     59 #define	PAGE_SHIFT	PGSHIFT
     60 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     61 #define	PAGE_MASK	(PAGE_SIZE - 1)
     62 
     63 /*
     64  * USRSTACK is the top (end) of the user stack.
     65  *
     66  * NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3)
     67  * is for HPUX compatibility.  Why??  Because HPUX's debuggers
     68  * have the user's stack hard-wired at FFF00000 for post-mortems,
     69  * and we must be compatible...
     70  */
     71 #define	USRSTACK	(-HIGHPAGES*PAGE_SIZE)	/* Start of user stack */
     72 #define	BTOPUSRSTACK	(0x100000-HIGHPAGES)	/* btop(USRSTACK) */
     73 #define	P1PAGES		0x100000
     74 #define	HIGHPAGES	(0x100000/PAGE_SIZE)
     75 
     76 /*
     77  * Virtual memory related constants, all in bytes
     78  */
     79 #ifndef MAXTSIZ
     80 #define	MAXTSIZ		(8*1024*1024)		/* max text size */
     81 #endif
     82 #ifndef DFLDSIZ
     83 #define	DFLDSIZ		(16*1024*1024)		/* initial data size limit */
     84 #endif
     85 #ifndef MAXDSIZ
     86 #define	MAXDSIZ		(64*1024*1024)		/* max data size */
     87 #endif
     88 #ifndef	DFLSSIZ
     89 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
     90 #endif
     91 #ifndef	MAXSSIZ
     92 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
     93 #endif
     94 
     95 /*
     96  * Sizes of the system and user portions of the system page table.
     97  */
     98 /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
     99 #define	SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
    100 #define	USRPTSIZE 	(1 * NPTEPG)	/* 4mb */
    101 
    102 /*
    103  * PTEs for mapping user space into the kernel for phyio operations.
    104  * One page is enough to handle 4Mb of simultaneous raw IO operations.
    105  */
    106 #ifndef USRIOSIZE
    107 #define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
    108 #endif
    109 
    110 /*
    111  * Mach derived constants
    112  */
    113 
    114 /* user/kernel map constants */
    115 #define VM_MIN_ADDRESS		((vaddr_t)0)
    116 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFF00000)
    117 #define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
    118 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
    119 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0-PAGE_SIZE*NPTEPG*2))
    120 
    121 /* virtual sizes (bytes) for various kernel submaps */
    122 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    123 
    124 /* # of kernel PT pages (initial only, can grow dynamically) */
    125 #define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
    126 
    127 /*
    128  * Constants which control the way the VM system deals with memory segments.
    129  */
    130 #define	VM_PHYSSEG_MAX		5			/* @@@ should really come from N_SIMM */
    131 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_RANDOM
    132 #define	VM_NFREELIST		1
    133 #define	VM_FREELIST_DEFAULT	0
    134 
    135 #define	__HAVE_PMAP_PHYSSEG
    136 
    137 /*
    138  * pmap-specific data stored in the vm_physmem[] array.
    139  */
    140 struct pmap_physseg {
    141 	struct pv_header *pvheader;	/* pv table for this seg */
    142 };
    143 
    144 #endif /* _MVME68K_VMPARAM_H_ */
    145