/* $NetBSD: vmparam.h,v 1.40 2020/10/14 00:59:50 thorpej Exp $ */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department and Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
 *
 *	@(#)vmparam.h	8.2 (Berkeley) 4/22/94
 */

#ifndef	_ALPHA_VMPARAM_H_
#define	_ALPHA_VMPARAM_H_

#include <machine/alpha_cpu.h>

#define __USE_TOPDOWN_VM

/*
 * Machine dependent constants for Alpha.
 */

/*
 * All systypes currently supported by NetBSD/alpha have an 8K pages.
 * Override the PAGE_* definitions to be compile-time constants.
 */
#define	PAGE_SHIFT	13
#define	PAGE_SIZE	(1 << PAGE_SHIFT)
#define	PAGE_MASK	(PAGE_SIZE - 1)

/*
 * Defaults for Unified Buffer Cache parameters.
 */

#ifndef UBC_WINSHIFT
#define	UBC_WINSHIFT	16	/* 64KB */
#endif
#ifndef	UBC_NWINS
#define	UBC_NWINS	4096	/* for a total of 256MB */
#endif

/*
 * USRSTACK is the top (end) of the user stack.
 *
 * Digital UNIX (formerly DEC OSF/1) places the stack below the
 * text segment (i.e. growing downward from 4G).  We may want to
 * consider doing that at some point, but it might require changes
 * to the exec code.
 */
#define	USRSTACK	((vaddr_t)0x0000000200000000)		/* 8G */

/*
 * Virtual memory related constants, all in bytes
 */
#ifndef MAXTSIZ
#define	MAXTSIZ		(1<<30)			/* max text size (1G) */
#endif
#ifndef DFLDSIZ
#define	DFLDSIZ		(1<<28)			/* initial data size (256M) */
#endif
#ifndef MAXDSIZ
#define	MAXDSIZ		(1<<30)			/* max data size (1G) */
#endif
#ifndef	DFLSSIZ
#define	DFLSSIZ		(1<<21)			/* initial stack size (2M) */
#endif
#ifndef	MAXSSIZ
#define	MAXSSIZ		(1<<25)			/* max stack size (32M) */
#endif

/*
 * PTEs for mapping user space into the kernel for phyio operations.
 * 64 pte's are enough to cover 8 disks * MAXBSIZE.
 */
#ifndef USRIOSIZE
#define USRIOSIZE	64
#endif

/*
 * Mach derived constants
 */

/* user/kernel map constants */
#define VM_MIN_ADDRESS		((vaddr_t)ALPHA_USEG_BASE)	    /* 0 */
#define VM_MAXUSER_ADDRESS	((vaddr_t)(ALPHA_USEG_END + 1L))    /* 4T */
#define VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)ALPHA_K1SEG_BASE)
#define VM_MAX_KERNEL_ADDRESS	trunc_page((vaddr_t)ALPHA_K1SEG_END)

/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)

/* some Alpha-specific constants */
#define	VPTBASE		((vaddr_t)0xfffffffc00000000)	/* Virt. pg table */

#define	VM_PHYSSEG_MAX		16		/* XXX */
#define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH

#define	VM_NFREELIST		2
#define	VM_FREELIST_DEFAULT	0
#define	VM_FREELIST_SHELTERED	1

#endif	/* ! _ALPHA_VMPARAM_H_ */