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/* $OpenBSD: vmparam.h,v 1.8 2006/06/04 17:20:39 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 VM_MAXUSER_ADDRESS /* 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 (32*1024*1024) /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ (64*1024*1024) /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ (2*1024*1024) /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ MAXDSIZ /* max stack size */
#endif
#define STACKGAP_RANDOM 256*1024
/*
* Size of shared memory map
*/
#ifndef SHMMAXPGS
#define SHMMAXPGS 1024
#endif
#define VM_MIN_ADDRESS ((vaddr_t)0)
#define VM_MAX_ADDRESS ((vaddr_t)0xfffff000)
#define VM_MAXUSER_ADDRESS VM_MAX_ADDRESS
/*
* Although user and supervisor address spaces are separate, we limit
* ourselves to 512KB KVM because the kernel page table is statically
* allocated.
*/
#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0)
#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0x20000000)
/* virtual sizes (bytes) for various kernel submaps */
#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_RANDOM
#define VM_PHYSSEG_NOADD
#define VM_NFREELIST 1
#define VM_FREELIST_DEFAULT 0
#ifndef _LOCORE
/*
* pmap-specific data stored in the vm_physmem[] array.
*/
/* XXX - belongs in pmap.h, but put here because of ordering issues */
struct pv_entry {
struct pv_entry *pv_next; /* next pv_entry */
struct pmap *pv_pmap; /* pmap where mapping lies */
vaddr_t pv_va; /* virtual address for mapping */
int pv_flags;
};
#define __HAVE_VM_PAGE_MD
struct vm_page_md {
struct pv_entry pvent;
};
#define VM_MDPAGE_INIT(pg) do { \
(pg)->mdpage.pvent.pv_next = NULL; \
(pg)->mdpage.pvent.pv_pmap = NULL; \
(pg)->mdpage.pvent.pv_va = 0; \
(pg)->mdpage.pvent.pv_flags = 0; \
} while (0)
#endif /* _LOCORE */
#endif /* _MACHINE_VM_PARAM_ */
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