/* $NetBSD: vmparam.h,v 1.41 2026/04/30 13:16:32 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 * MAXPHYS.
 */
#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_ */