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+/* $NetBSD: vmparam.h,v 1.9 1995/08/22 04:28:20 ragge Exp $ */
+
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * William Jolitz.
+ *
+ * Slightly modified for the VAX port /IC
+ *
+ * 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. 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
+ * SUCH DAMAGE.
+ *
+ * @(#)vmparam.h 5.9 (Berkeley) 5/12/91
+ */
+#ifndef ASSEMBLER
+#include <vm/vm_param.h>
+#endif
+
+/*
+ * Machine dependent constants for VAX.
+ */
+
+/*
+ * Virtual address space arrangement. On 386, both user and kernel
+ * share the address space, not unlike the vax.
+ * USRTEXT is the start of the user text/data space, while USRSTACK
+ * is the top (end) of the user stack. Immediately above the user stack
+ * resides the user structure, which is UPAGES long and contains the
+ * kernel stack.
+ *
+ */
+
+#define USRTEXT 0x400
+#define USRSTACK 0x7fffe000 /* XXX */
+
+/*
+ * Virtual memory related constants, all in bytes
+ */
+
+#ifndef MAXTSIZ
+#define MAXTSIZ (6*1024*1024) /* max text size */
+#endif
+#ifndef MAXDSIZ
+#define MAXDSIZ (16*1024*1024) /* max data size */
+#endif
+#ifndef MAXSSIZ
+#define MAXSSIZ (16*1024*1024) /* max stack size */
+#endif
+#ifndef DFLDSIZ
+#define DFLDSIZ (6*1024*1024) /* initial data size limit */
+#endif
+#ifndef DFLSSIZ
+#define DFLSSIZ (512*1024) /* initial stack size limit */
+#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.
+ */
+
+#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 64 /* XXXX should be 1024 */
+#endif
+
+/*
+ * Sizes of the system and user portions of the system page table.
+ * USRPTSIZE is maximum possible user virtual memory to be used.
+ * KALLOCMEM is kernel malloc area size. How much needed for each process?
+ * SYSPTSIZE is total size of statically allocated pte. (in physmem)
+ * Ptsizes are in PTEs.
+ */
+
+#define USRPTSIZE ((MAXDSIZ >> PG_SHIFT) * maxproc)
+#define KALLOCMEM (((1*1024*1024*maxproc)>>PG_SHIFT)/4)
+#define SYSPTSIZE (((USRPTSIZE * 4) >> PG_SHIFT) + UPAGES * maxproc + \
+ KALLOCMEM)
+
+/*
+ * 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.
+ * 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
+ * $30/mb or about $0.75.
+ */
+
+#define SAFERSS 8 /* nominal ``small'' resident set size
+ protected against replacement */
+
+/*
+ * There are two clock hands, initially separated by HANDSPREAD bytes
+ * (but at most all of user memory). The amount of time to reclaim
+ * a page once the pageout process examines it increases with this
+ * distance and decreases as the scan rate rises.
+ */
+
+#define HANDSPREAD (2 * 1024 * 1024)
+
+/*
+ * The number of times per second to recompute the desired paging rate
+ * and poke the pagedaemon.
+ */
+
+#define RATETOSCHEDPAGING 4
+
+/*
+ * Believed threshold (in megabytes) for which interleaved
+ * swapping area is desirable.
+ */
+
+#define LOTSOFMEM 2
+
+#define mapin(pte, v, pfnum, prot) \
+ {(*(int *)(pte) = ((pfnum)<<PGSHIFT) | (prot)) ; }
+
+/*
+ * Mach derived constants
+ */
+
+/* user/kernel map constants */
+#define VM_MIN_ADDRESS ((vm_offset_t)0)
+#define VM_MAXUSER_ADDRESS ((vm_offset_t)0x7FFFE000)
+#define VM_MAX_ADDRESS ((vm_offset_t)0xC0000000)
+#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0x80000000)
+#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)(VM_MIN_KERNEL_ADDRESS+\
+ (VM_KERNEL_PT_PAGES*0x10000)))
+
+/* virtual sizes (bytes) for various kernel submaps */
+#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
+#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)
+#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
+
+/* pcb base */
+#define pcbb(p) ((u_int)(p)->p_addr)
+