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vmparam.h revision 1.24 
      1 /*	$NetBSD: vmparam.h,v 1.24 2002/12/10 05:14:36 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1982, 1986, 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *	This product includes software developed by the University of
     23  *	California, Berkeley and its contributors.
     24  * 4. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
     41  *
     42  *	@(#)vmparam.h	8.2 (Berkeley) 4/19/94
     43  */
     44 
     45 #ifndef _X68K_VMPARAM_H_
     46 #define	_X68K_VMPARAM_H_
     47 
     48 /*
     49  * Machine dependent constants for X68K
     50  */
     51 
     52 /*
     53  * We use 4K pages on the X68K.  Override the PAGE_* definitions
     54  * to be compile-time constants.
     55  */
     56 #define	PAGE_SHIFT	12
     57 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     58 #define	PAGE_MASK	(PAGE_SIZE - 1)
     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		(8*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		(512*1024)		/* initial stack size limit */
     79 #endif
     80 #ifndef	MAXSSIZ
     81 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
     82 #endif
     83 
     84 /*
     85  * Sizes of the system and user portions of the system page table.
     86  */
     87 /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
     88 #define	SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
     89 #define	USRPTSIZE 	(1 * NPTEPG)	/* 4mb */
     90 
     91 /*
     92  * PTEs for mapping user space into the kernel for phyio operations.
     93  * One page is enough to handle 4Mb of simultaneous raw IO operations.
     94  */
     95 #ifndef USRIOSIZE
     96 #define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
     97 #endif
     98 
     99 /*
    100  * PTEs for system V style shared memory.
    101  * This is basically slop for kmempt which we actually allocate (malloc) from.
    102  */
    103 #ifndef SHMMAXPGS
    104 #define SHMMAXPGS	1024		/* 4mb */
    105 #endif
    106 
    107 /*
    108  * Mach derived constants
    109  */
    110 
    111 /* user/kernel map constants */
    112 #define VM_MIN_ADDRESS		((vaddr_t)0)
    113 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFFFD000)
    114 #define VM_MAX_ADDRESS		((vaddr_t)0xFFFFD000)
    115 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
    116 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFFFFF000)
    117 
    118 /* virtual sizes (bytes) for various kernel submaps */
    119 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
    120 
    121 /* # of kernel PT pages (initial only, can grow dynamically) */
    122 #define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
    123 
    124 /*
    125  * Constants which control the way the VM system deals with memory segments.
    126  */
    127 #define	VM_PHYSSEG_MAX		3
    128 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
    129 				/* Actually VM_PSTRAT_UPPERFIRST is needed */
    130 #define	VM_PHYSSEG_NOADD
    131 
    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_entry *pvent;		/* pv table for this seg */
    142 	char *attrs;			/* page attributes for this seg */
    143 };
    144 
    145 #endif /* _X68K_VMPARAM_H_ */
    146