/* $NetBSD: vmparam.h,v 1.16 2020/08/10 10:59:33 rin Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#define __USE_TOPDOWN_VM
/*
* Machine dependent constants for Sun2
*
* The Sun2 has limited total kernel virtual space (14MB) and
* can not use main memory for page tables. (All active PTEs
* must be installed in special translation RAM in the MMU).
* Therefore, parameters that would normally configure the
* size of various page tables are irrelevant. Only things
* that consume portions of kernel virtual (KV) space matter,
* and those things should be chosen to conserve KV space.
*/
/*
* The Sun2 has 2K pages. Override PAGE_* to be compile-time constants.
*/
#define PAGE_SHIFT 11
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_MASK (PAGE_SIZE - 1)
/*
* We definitely need a small pager map.
*/
#define PAGER_MAP_DEFAULT_SIZE (1 * 1024 * 1024)
/*
* USRSTACK is the top (end) of the user stack.
*/
#define USRSTACK 0x1000000 /* High end of user stack */
/*
* Virtual memory related constants, all in bytes.
* The Sun2 has only 16 MB of user-virtual space,
* so we need to be conservative with these limits.
*/
#ifndef MAXTSIZ
#define MAXTSIZ (5*1024*1024) /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ (4*1024*1024) /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ (6*1024*1024) /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ (512*1024) /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ (4*1024*1024) /* max stack size */
#endif
/*
* PTEs for mapping user space into the kernel for phyio operations.
* The actual limitation for physio requests will be the DVMA space,
* and that is fixed by hardware design at 256K. We could make the
* physio map larger than that, but it would not buy us much.
*/
#ifndef USRIOSIZE
#define USRIOSIZE 128 /* 256K */
#endif
