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vmparam.h revision 1.31 
      1 /*	$NetBSD: vmparam.h,v 1.31 2002/12/10 05:14:30 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 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 and Ralph Campbell.
     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) 4/22/94
     43  */
     44 
     45 #ifndef _MIPS_VMPARAM_H_
     46 #define	_MIPS_VMPARAM_H_
     47 
     48 /*
     49  * Machine dependent VM constants for MIPS.
     50  */
     51 
     52 /*
     53  * We use a 4K page on MIPS systems.  Override PAGE_* definitions
     54  * to 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  * USRSTACK needs to start a little below 0x8000000 because the R8000
     64  * and some QED CPUs perform some virtual address checks before the
     65  * offset is calculated.
     66  */
     67 #define	USRSTACK	0x7ffff000		/* Start of user stack */
     68 
     69 /* alignment requirement for u-area space in bytes */
     70 #define	USPACE_ALIGN	USPACE
     71 
     72 /*
     73  * Virtual memory related constants, all in bytes
     74  */
     75 #ifndef MAXTSIZ
     76 #define	MAXTSIZ		(64*1024*1024)		/* max text size */
     77 #endif
     78 #ifndef DFLDSIZ
     79 #define	DFLDSIZ		(128*1024*1024)		/* initial data size limit */
     80 #endif
     81 #ifndef MAXDSIZ
     82 #define	MAXDSIZ		(512*1024*1024)		/* max data size */
     83 #endif
     84 #ifndef	DFLSSIZ
     85 #define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
     86 #endif
     87 #ifndef	MAXSSIZ
     88 #define	MAXSSIZ		(32*1024*1024)		/* max stack size */
     89 #endif
     90 
     91 /*
     92  * PTEs for mapping user space into the kernel for phyio operations.
     93  * The default PTE number is enough to cover 8 disks * MAXBSIZE.
     94  */
     95 #ifndef USRIOSIZE
     96 #define USRIOSIZE	(MAXBSIZE/NBPG * 8)
     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)0x00000000)
    113 #define VM_MAXUSER_ADDRESS	((vaddr_t)0x80000000)
    114 #define VM_MAX_ADDRESS		((vaddr_t)0x80000000)
    115 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0xC0000000)
    116 #ifdef ENABLE_MIPS_TX3900
    117 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFF000000)
    118 #else
    119 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFFFFC000)
    120 #endif
    121 
    122 /* virtual sizes (bytes) for various kernel submaps */
    123 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
    124 
    125 /* VM_PHYSSEG_MAX defined by platform-dependent code. */
    126 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
    127 #define	VM_PHYSSEG_NOADD	/* can add RAM after vm_mem_init */
    128 
    129 #define	__HAVE_PMAP_PHYSSEG
    130 
    131 /*
    132  * pmap-specific data stored in the vm_physmem[] array.
    133  */
    134 struct pmap_physseg {
    135 	struct pv_entry *pvent;		/* pv table for this seg */
    136 	char *attrs;			/* page attributes for this seg */
    137 };
    138 
    139 #endif /* ! _MIPS_VMPARAM_H_ */
    140