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vmparam.h revision 1.32.4.1 
      1 /*	$NetBSD: vmparam.h,v 1.32.4.1 2019/06/10 22:05:58 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
      6  * 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	7.3 (Berkeley) 5/7/91
     39  */
     40 
     41 #ifndef _MACHINE_VMPARAM_H_
     42 #define _MACHINE_VMPARAM_H_
     43 
     44 /*
     45  * Machine dependent constants for atari
     46  */
     47 
     48 /*
     49  * We use 8K pages on the Atari.  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
     60 
     61 /*
     62  * Virtual memory related constants, all in bytes
     63  */
     64 
     65 #ifndef MAXTSIZ
     66 #define	MAXTSIZ		(32*1024*1024)		/* max text size */
     67 #endif
     68 #ifndef DFLDSIZ
     69 #define	DFLDSIZ		(32*1024*1024)		/* initial data size limit */
     70 #endif
     71 #ifndef MAXDSIZ
     72 #define	MAXDSIZ		(256*1024*1024)		/* max data size */
     73 #endif
     74 #ifndef	DFLSSIZ
     75 #define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
     76 #endif
     77 #ifndef	MAXSSIZ
     78 #define	MAXSSIZ		(256*1024*1024)		/* max stack size */
     79 #endif
     80 
     81 /*
     82  * PTEs for mapping user space into the kernel for phyio operations.
     83  * One page is enough to handle 16Mb of simultaneous raw IO operations.
     84  */
     85 #ifndef USRIOSIZE
     86 #define USRIOSIZE	(1 * NPTEPG)	/* 16mb */
     87 #endif
     88 
     89 /*
     90  * user/kernel map constants
     91  */
     92 #define VM_MIN_ADDRESS		((vaddr_t)0)
     93 #define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
     94 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFF00000)
     95 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
     96 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)-(NPTEPG * PAGE_SIZE))
     97 
     98 /*
     99  * virtual sizes (bytes) for various kernel submaps
    100  */
    101 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    102 
    103 /*
    104  * Our bootloader currently passes up to 2 segments (ST and TT ram).
    105  * On the other hand, Milan has four SIMM slots with 2 banks
    106  * so it could have upto 8 segments.
    107  */
    108 #define VM_PHYSSEG_MAX		(8)
    109 #define VM_PHYSSEG_STRAT	VM_PSTRAT_RANDOM
    110 
    111 #define	VM_NFREELIST		2
    112 #define	VM_FREELIST_DEFAULT	0
    113 #define	VM_FREELIST_TTRAM	VM_FREELIST_DEFAULT
    114 #define	VM_FREELIST_STRAM	1
    115 
    116 #define	__HAVE_PMAP_PHYSSEG
    117 
    118 /*
    119  * pmap-specific data stored in the vm_physmem[] array.
    120  */
    121 struct pmap_physseg {
    122 	struct pv_header *pvheader;	/* pv table for this seg */
    123 };
    124 
    125 
    126 /*
    127  * number of kernel PT pages (initial only, can grow dynamically)
    128  */
    129 #define VM_KERNEL_PT_PAGES	((vsize_t)4)
    130 #endif /* !_MACHINE_VMPARAM_H_ */
    131