Home | History | Annotate | Line # | Download | only in include
vmparam.h revision 1.33 
      1 /*	$NetBSD: vmparam.h,v 1.33 2011/02/08 20:20:26 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 _X68K_VMPARAM_H_
     42 #define	_X68K_VMPARAM_H_
     43 
     44 /*
     45  * Machine dependent constants for X68K
     46  */
     47 
     48 /*
     49  * We use 4K pages on the X68K.  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 #define	USRSTACK	VM_MAXUSER_ADDRESS	/* Start of user stack */
     60 
     61 /*
     62  * Virtual memory related constants, all in bytes
     63  */
     64 #ifndef MAXTSIZ
     65 #define	MAXTSIZ		(8*1024*1024)		/* max text size */
     66 #endif
     67 #ifndef DFLDSIZ
     68 #define	DFLDSIZ		(16*1024*1024)		/* initial data size limit */
     69 #endif
     70 #ifndef MAXDSIZ
     71 #define	MAXDSIZ		(64*1024*1024)		/* max data size */
     72 #endif
     73 #ifndef	DFLSSIZ
     74 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
     75 #endif
     76 #ifndef	MAXSSIZ
     77 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
     78 #endif
     79 
     80 /*
     81  * Sizes of the system and user portions of the system page table.
     82  */
     83 /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
     84 #define	SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
     85 #define	USRPTSIZE 	(1 * NPTEPG)	/* 4mb */
     86 
     87 /*
     88  * PTEs for mapping user space into the kernel for phyio operations.
     89  * One page is enough to handle 4Mb of simultaneous raw IO operations.
     90  */
     91 #ifndef USRIOSIZE
     92 #define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
     93 #endif
     94 
     95 /*
     96  * Mach derived constants
     97  */
     98 
     99 /* user/kernel map constants */
    100 #define VM_MIN_ADDRESS		((vaddr_t)0)
    101 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFFFD000)
    102 #define VM_MAX_ADDRESS		((vaddr_t)0xFFFFD000)
    103 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
    104 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0-PAGE_SIZE*NPTEPG))
    105 
    106 /* virtual sizes (bytes) for various kernel submaps */
    107 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    108 
    109 /* # of kernel PT pages (initial only, can grow dynamically) */
    110 #define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
    111 
    112 /*
    113  * Constants which control the way the VM system deals with memory segments.
    114  */
    115 #define	VM_PHYSSEG_MAX		3
    116 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
    117 				/* Actually VM_PSTRAT_UPPERFIRST is needed */
    118 
    119 #define	VM_NFREELIST		1
    120 #define	VM_FREELIST_DEFAULT	0
    121 
    122 #define	__HAVE_PMAP_PHYSSEG
    123 
    124 /*
    125  * pmap-specific data stored in the vm_physmem[] array.
    126  */
    127 struct pmap_physseg {
    128 	struct pv_header *pvheader;	/* pv table for this seg */
    129 };
    130 
    131 #endif /* _X68K_VMPARAM_H_ */
    132