140 lines
4.9 KiB
C
140 lines
4.9 KiB
C
/* $NetBSD: vmparam.h,v 1.1 2001/04/06 13:13:05 fredette Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Machine dependent constants for Sun2
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*
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* The Sun2 has limited total kernel virtual space (14MB) and
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* can not use main memory for page tables. (All active PTEs
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* must be installed in special translation RAM in the MMU).
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* Therefore, parameters that would normally configure the
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* size of various page tables are irrelevant. Only things
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* that consume portions of kernel virtual (KV) space matter,
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* and those things should be chosen to conserve KV space.
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*/
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/*
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* We definitely need a small pager map.
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*/
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#define PAGER_MAP_SIZE (1 * 1024 * 1024)
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/*
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* USRTEXT is the start of the user text/data space, while
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* USRSTACK is the top (end) of the user stack.
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*/
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#define USRTEXT NBPG /* Start of user text */
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#define USRSTACK 0x1000000 /* High end of user stack */
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/*
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* Virtual memory related constants, all in bytes.
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* The Sun2 has only 16 MB of user-virtual space,
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* so we need to be conservative with these limits.
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*/
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#ifndef MAXTSIZ
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#define MAXTSIZ (5*1024*1024) /* max text size */
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#endif
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#ifndef DFLDSIZ
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#define DFLDSIZ (4*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (6*1024*1024) /* max data size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (512*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ (4*1024*1024) /* max stack size */
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#endif
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/*
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* PTEs for mapping user space into the kernel for phyio operations.
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* The actual limitation for physio requests will be the DVMA space,
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* and that is fixed by hardware design at 256K. We could make the
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* physio map larger than that, but it would not buy us much.
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*/
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#ifndef USRIOSIZE
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#define USRIOSIZE 128 /* 256K */
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#endif
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/*
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* PTEs for system V style shared memory.
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* This is basically slop for kmempt which we actually allocate (malloc) from.
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*/
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#ifndef SHMMAXPGS
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#define SHMMAXPGS 512 /* 4 MB */
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#endif
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/*
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* Mach-derived constants:
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*/
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/* user/kernel map constants */
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#define VM_MIN_ADDRESS ((vm_offset_t)0)
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#define VM_MAX_ADDRESS ((vm_offset_t)USRSTACK)
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#define VM_MAXUSER_ADDRESS ((vm_offset_t)USRSTACK)
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#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE)
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#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)KERN_END)
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/* virtual sizes (bytes) for various kernel submaps */
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#define VM_PHYS_SIZE (USRIOSIZE*NBPG)
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#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
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#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
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#define VM_NFREELIST 1
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#define VM_FREELIST_DEFAULT 0
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#ifdef _LKM
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#define USRSTACK KERNBASE
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extern char KERNBASE[];
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#endif /* _LKM */
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/* This is needed by some LKMs. */
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#define VM_PHYSSEG_MAX 4
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struct pmap_physseg {
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/* NULL */
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};
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/*
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* The time for a process to be blocked before being very swappable.
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* This is a number of seconds which the system takes as being a non-trivial
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* amount of real time. You probably shouldn't change this;
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* it is used in subtle ways (fractions and multiples of it are, that is, like
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* half of a ``long time'', almost a long time, etc.)
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* It is related to human patience and other factors which don't really
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* change over time.
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*/
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#define MAXSLP 20
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