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/* $OpenBSD: vmparam.h,v 1.15 2001/08/12 19:30:19 miod Exp $ */
/*
* Mach Operating System
* Copyright (c) 1992 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* machine dependent virtual memory parameters.
*/
#ifndef _MACHINE_VM_PARAM_
#define _MACHINE_VM_PARAM_
/*
* USRTEXT is the start of the user text/data space, while USRSTACK
* is the top (end) of the user stack.
*/
#define USRTEXT 0x1000 /* Start of user text */
#define USRSTACK 0x80000000 /* Start of user stack */
/*
* Virtual memory related constants, all in bytes
*/
#ifndef MAXTSIZ
#define MAXTSIZ (8*1024*1024) /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ (16*1024*1024) /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ (64*1024*1024) /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ (512*1024) /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ MAXDSIZ /* max stack size */
#endif
/*
* 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.
* vminit() insures this.
*/
#define DMMIN 32 /* smallest swap allocation */
#define DMMAX 4096 /* largest potential swap allocation */
#define DMTEXT 1024 /* swap allocation for text */
/*
* Size of shared memory map
*/
#ifndef SHMMAXPGS
#define SHMMAXPGS 1024
#endif
/*
* 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
* change over time.
*/
#define MAXSLP 20
/*
* 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.
*/
#define SAFERSS 4 /* nominal ``small'' resident set size
protected against replacement */
/*
* Mach derived constants
*/
#define VM_MIN_ADDRESS ((vm_offset_t) 0)
#define VM_MAX_ADDRESS ((vm_offset_t) 0xffc00000U)
#define VM_MAXUSER_ADDRESS VM_MAX_ADDRESS
/* on vme188, max = 0xf0000000 */
#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t) 0)
#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t) 0x1fffffff)
#define KERNEL_STACK_SIZE (3 * PAGE_SIZE) /* kernel stack size */
#define INTSTACK_SIZE (3 * PAGE_SIZE) /* interrupt stack size */
/* virtual sizes (bytes) for various kernel submaps */
#define VM_MBUF_SIZE (NMBCLUSTERS * MCLBYTES)
#define VM_KMEM_SIZE (NKMEMCLUSTERS * PAGE_SIZE)
#define VM_PHYS_SIZE (1 * NPTEPG * PAGE_SIZE)
/*
* Constants which control the way the VM system deals with memory segments.
* The mvme88k only has one physical memory segment.
*/
#define VM_PHYSSEG_MAX 1
#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
#define VM_PHYSSEG_NOADD
#define VM_NFREELIST 1
#define VM_FREELIST_DEFAULT 0
#ifndef _LOCORE
/*
* pmap-specific data stored in the vm_physmem[] array.
*/
struct pmap_physseg {
struct pv_entry *pvent; /* pv table for this seg */
char *attrs; /* page modify list for this seg */
struct simplelock *plock; /* page lock for this seg */
};
#endif /* _LOCORE */
#endif /* _MACHINE_VM_PARAM_ */
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