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      1 /* $NetBSD: vmparam.h,v 1.40 2020/10/14 00:59:50 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. 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) 4/22/94
     39  */
     40 
     41 #ifndef	_ALPHA_VMPARAM_H_
     42 #define	_ALPHA_VMPARAM_H_
     43 
     44 #include <machine/alpha_cpu.h>
     45 
     46 #define __USE_TOPDOWN_VM
     47 
     48 /*
     49  * Machine dependent constants for Alpha.
     50  */
     51 
     52 /*
     53  * All systypes currently supported by NetBSD/alpha have an 8K pages.
     54  * Override the PAGE_* definitions to be compile-time constants.
     55  */
     56 #define	PAGE_SHIFT	13
     57 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     58 #define	PAGE_MASK	(PAGE_SIZE - 1)
     59 
     60 /*
     61  * Defaults for Unified Buffer Cache parameters.
     62  */
     63 
     64 #ifndef UBC_WINSHIFT
     65 #define	UBC_WINSHIFT	16	/* 64KB */
     66 #endif
     67 #ifndef	UBC_NWINS
     68 #define	UBC_NWINS	4096	/* for a total of 256MB */
     69 #endif
     70 
     71 /*
     72  * USRSTACK is the top (end) of the user stack.
     73  *
     74  * Digital UNIX (formerly DEC OSF/1) places the stack below the
     75  * text segment (i.e. growing downward from 4G).  We may want to
     76  * consider doing that at some point, but it might require changes
     77  * to the exec code.
     78  */
     79 #define	USRSTACK	((vaddr_t)0x0000000200000000)		/* 8G */
     80 
     81 /*
     82  * Virtual memory related constants, all in bytes
     83  */
     84 #ifndef MAXTSIZ
     85 #define	MAXTSIZ		(1<<30)			/* max text size (1G) */
     86 #endif
     87 #ifndef DFLDSIZ
     88 #define	DFLDSIZ		(1<<28)			/* initial data size (256M) */
     89 #endif
     90 #ifndef MAXDSIZ
     91 #define	MAXDSIZ		(1<<30)			/* max data size (1G) */
     92 #endif
     93 #ifndef	DFLSSIZ
     94 #define	DFLSSIZ		(1<<21)			/* initial stack size (2M) */
     95 #endif
     96 #ifndef	MAXSSIZ
     97 #define	MAXSSIZ		(1<<25)			/* max stack size (32M) */
     98 #endif
     99 
    100 /*
    101  * PTEs for mapping user space into the kernel for phyio operations.
    102  * 64 pte's are enough to cover 8 disks * MAXBSIZE.
    103  */
    104 #ifndef USRIOSIZE
    105 #define USRIOSIZE	64
    106 #endif
    107 
    108 /*
    109  * Mach derived constants
    110  */
    111 
    112 /* user/kernel map constants */
    113 #define VM_MIN_ADDRESS		((vaddr_t)ALPHA_USEG_BASE)	    /* 0 */
    114 #define VM_MAXUSER_ADDRESS	((vaddr_t)(ALPHA_USEG_END + 1L))    /* 4T */
    115 #define VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
    116 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)ALPHA_K1SEG_BASE)
    117 #define VM_MAX_KERNEL_ADDRESS	trunc_page((vaddr_t)ALPHA_K1SEG_END)
    118 
    119 /* virtual sizes (bytes) for various kernel submaps */
    120 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    121 
    122 /* some Alpha-specific constants */
    123 #define	VPTBASE		((vaddr_t)0xfffffffc00000000)	/* Virt. pg table */
    124 
    125 #define	VM_PHYSSEG_MAX		16		/* XXX */
    126 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
    127 
    128 #define	VM_NFREELIST		2
    129 #define	VM_FREELIST_DEFAULT	0
    130 #define	VM_FREELIST_SHELTERED	1
    131 
    132 #endif	/* ! _ALPHA_VMPARAM_H_ */
    133