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vmparam.h revision 1.15 
      1 /*	$NetBSD: vmparam.h,v 1.15 2011/02/08 20:20:11 rmind 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. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
     37  *
     38  *	@(#)vmparam.h	8.2 (Berkeley) 4/19/94
     39  */
     40 
     41 #ifndef _MACHINE_VMPARAM_H_
     42 #define	_MACHINE_VMPARAM_H_
     43 
     44 /*
     45  * Machine dependent constants for cesfic
     46  */
     47 
     48 /*
     49  * We use 4K pages on the cesfic.  Override the PAGE_* definitions
     50  * to be compile-time constants.
     51  */
     52 #define	PAGE_SHIFT	PGSHIFT
     53 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     54 #define	PAGE_MASK	(PAGE_SIZE - 1)
     55 
     56 /*
     57  * USRSTACK is the top (end) of the user stack.
     58  *
     59  * NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3)
     60  * is for HPUX compatibility.  Why??  Because HPUX's debuggers
     61  * have the user's stack hard-wired at FFF00000 for post-mortems,
     62  * and we must be compatible...
     63  */
     64 #define	USRSTACK	(-HIGHPAGES*PAGE_SIZE)	/* Start of user stack */
     65 #define	BTOPUSRSTACK	(0x100000-HIGHPAGES)	/* btop(USRSTACK) */
     66 #define P1PAGES		0x100000
     67 #define HIGHPAGES	(0x100000/PAGE_SIZE)
     68 
     69 /*
     70  * Virtual memory related constants, all in bytes
     71  */
     72 #ifndef MAXTSIZ
     73 #define	MAXTSIZ		(8*1024*1024)		/* max text size */
     74 #endif
     75 #ifndef DFLDSIZ
     76 #define	DFLDSIZ		(32*1024*1024)		/* initial data size limit */
     77 #endif
     78 #ifndef MAXDSIZ
     79 #define	MAXDSIZ		(64*1024*1024)		/* max data size */
     80 #endif
     81 #ifndef	DFLSSIZ
     82 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
     83 #endif
     84 #ifndef	MAXSSIZ
     85 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
     86 #endif
     87 
     88 /*
     89  * Default sizes of swap allocation chunks (see dmap.h).
     90  * The actual values may be changed in vminit() based on MAXDSIZ.
     91  * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
     92  * DMMIN should be at least ctod(1) so that vtod() works.
     93  * vminit() insures this.
     94  */
     95 #define	DMMIN	32			/* smallest swap allocation */
     96 #define	DMMAX	4096			/* largest potential swap allocation */
     97 
     98 /*
     99  * Sizes of the system and user portions of the system page table.
    100  */
    101 /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
    102 #define	SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
    103 #define	USRPTSIZE 	(1 * NPTEPG)	/* 4mb */
    104 
    105 /*
    106  * PTEs for mapping user space into the kernel for phyio operations.
    107  * One page is enough to handle 4Mb of simultaneous raw IO operations.
    108  */
    109 #ifndef USRIOSIZE
    110 #define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
    111 #endif
    112 
    113 /*
    114  * Mach derived constants
    115  */
    116 
    117 /* user/kernel map constants */
    118 #define VM_MIN_ADDRESS		((vaddr_t)0)
    119 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFF00000)
    120 #define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
    121 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0x00002000)
    122 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0-PAGE_SIZE*NPTEPG*2))
    123 
    124 /* virtual sizes (bytes) for various kernel submaps */
    125 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    126 
    127 /* # of kernel PT pages (initial only, can grow dynamically) */
    128 #define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
    129 
    130 /* Use new VM page bootstrap interface. */
    131 #define	MACHINE_NEW_NONCONTIG
    132 
    133 /*
    134  * Constants which control the way the VM system deals with memory segments.
    135  * The cesfic only has one usable physical memory segment.
    136  */
    137 #define	VM_PHYSSEG_MAX		1
    138 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
    139 
    140 #define	VM_NFREELIST		1
    141 #define	VM_FREELIST_DEFAULT	0
    142 
    143 #define	__HAVE_PMAP_PHYSSEG
    144 
    145 /*
    146  * pmap-specific data stored in the vm_physmem[] array.
    147  */
    148 struct pmap_physseg {
    149 	struct pv_header *pvheader;	/* pv table for this seg */
    150 };
    151 
    152 #endif /* _MACHINE_VMPARAM_H_ */
    153