* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
* @(#)vmparam.h 8.1 (Berkeley) 6/11/93
* from: $Header: vmparam.h,v 1.8 93/05/25 09:52:16 torek Exp $
* Machine dependent constants for Sun-4c SPARC
* USRTEXT is the start of the user text/data space, while USRSTACK
* is the top (end) of the user stack.
#define USRTEXT 0x2000 /* Start of user text */
#define USRSTACK KERNBASE /* Start of user stack */
* Virtual memory related constants, all in bytes
#define MAXTSIZ (8*1024*1024) /* max text size */
#define DFLDSIZ (16*1024*1024) /* initial data size limit */
#define MAXDSIZ (64*1024*1024) /* max data size */
#define DFLSSIZ (512*1024) /* initial stack size limit */
#define MAXSSIZ MAXDSIZ /* max stack size */
* Default sizes of swap allocation chunks (see dmap.h).
* The actual values may be changed in vminit() based on MAXDSIZ.
* With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
* DMMIN should be at least ctod(1) so that vtod() works.
#define DMMIN 32 /* smallest swap allocation */
#define DMMAX 4096 /* largest potential swap allocation */
#define DMTEXT 1024 /* swap allocation for text */
* The time for a process to be blocked before being very swappable.
* This is a number of seconds which the system takes as being a non-trivial
* amount of real time. You probably shouldn't change this;
* it is used in subtle ways (fractions and multiples of it are, that is, like
* half of a ``long time'', almost a long time, etc.)
* It is related to human patience and other factors which don't really
* A swapped in process is given a small amount of core without being bothered
* by the page replacement algorithm. Basically this says that if you are
* swapped in you deserve some resources. We protect the last SAFERSS
* pages against paging and will just swap you out rather than paging you.
* Note that each process has at least UPAGES+CLSIZE pages which are not
* paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
* number just means a swapped in process is given around 25k bytes.
* Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
* so we loan each swapped in process memory worth 100$, or just admit
* that we don't consider it worthwhile and swap it out to disk which costs
#define SAFERSS 4 /* nominal ``small'' resident set size
protected against replacement */
* User/kernel map constants. Note that sparc/vaddrs.h defines the
* IO space virtual base, which must be the same as VM_MAX_KERNEL_ADDRESS:
#define VM_MIN_ADDRESS ((vm_offset_t)0x2000) /* texts start at 8K */
#define VM_MAX_ADDRESS ((vm_offset_t)KERNBASE)
#define VM_MAXUSER_ADDRESS ((vm_offset_t)KERNBASE)
#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNBASE)
#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xfe000000)
/* virtual sizes (bytes) for various kernel submaps */
#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)
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