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/* $OpenBSD: vmparam.h,v 1.2 2003/06/02 23:27:48 millert Exp $ */
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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.
* 3. 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
* SUCH DAMAGE.
*/
/*
* Machine dependent constants for m68k-based platforms.
*/
#ifndef _M68K_VMPARAM_H_
#define _M68K_VMPARAM_H_
/*
* USRTEXT is the start of the user text/data space, while USRSTACK
* is the top (end) of the user stack. LOWPAGES and HIGHPAGES are
* the number of pages from the beginning of the P0 region to the
* beginning of the text and from the beginning of the P1 region to the
* beginning of the stack respectively.
*
* NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3)
* is for HPUX compatibility. Why?? Because HPUX's debuggers
* have the user's stack hard-wired at FFF00000 for post-mortems,
* and we must be compatible...
*/
#define USRTEXT 8192
#define USRSTACK (-HIGHPAGES*NBPG) /* Start of user stack */
#define LOWPAGES 0
#define HIGHPAGES (0x100000/NBPG)
/*
* 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
/*
* Sizes of the system and user portions of the system page table.
*/
#define USRPTSIZE (1 * NPTEPG) /* 4mb */
/*
* PTEs for mapping user space into the kernel for phyio operations.
* One page is enough to handle 4Mb of simultaneous raw IO operations.
*/
#ifndef USRIOSIZE
#define USRIOSIZE (1 * NPTEPG) /* 4mb */
#endif
/*
* PTEs for system V style shared memory.
* This is basically slop for kmempt which we actually allocate (malloc) from.
*/
#ifndef SHMMAXPGS
#define SHMMAXPGS 1024 /* 4mb */
#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
/* user/kernel map constants */
#define VM_MIN_ADDRESS ((vaddr_t)0)
#define VM_MAXUSER_ADDRESS ((vaddr_t)(USRSTACK))
#define VM_MAX_ADDRESS ((vaddr_t)(0-(UPAGES*NBPG)))
#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0)
#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(0-NBPG))
/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
/* # of kernel PT pages (initial only, can grow dynamically) */
#define VM_KERNEL_PT_PAGES ((vsize_t)2)
/* pcb base */
#define pcbb(p) ((u_int)(p)->p_addr)
/*
* Constants which control the way the VM system deals with memory segments.
*/
#define VM_PHYSSEG_NOADD
#define VM_NFREELIST 1
#define VM_FREELIST_DEFAULT 0
#ifndef _LOCORE
#include <machine/pte.h> /* st_entry_t */
/* 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 */
st_entry_t *pv_ptste; /* non-zero if VA maps a PT page */
struct pmap *pv_ptpmap; /* if pv_ptste, pmap for PT page */
int pv_flags; /* flags */
};
/*
* pv_flags carries some PTE permission bits as well - make sure extra flags
* values are > (1 << PG_SHIFT)
*/
/* header: all entries are cache inhibited */
#define PV_CI (0x01 << PG_SHIFT)
/* header: entry maps a page table page */
#define PV_PTPAGE (0x02 << PG_SHIFT)
#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_ptste = NULL; \
(pg)->mdpage.pvent.pv_ptpmap = NULL; \
(pg)->mdpage.pvent.pv_flags = 0; \
} while (0)
#endif /* _LOCORE */
#endif /* !_M68K_VMPARAM_H_ */
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