/* $NetBSD: vmparam.h,v 1.2 1998/08/28 23:05:54 dbj Exp $ */ /* * This file was taken from from mvme68k/include/vmparam.h and * should probably be re-synced when needed. * Darrin B Jewell Fri Aug 28 03:22:07 1998 * original cvs id: NetBSD: vmparam.h,v 1.9 1998/08/22 10:55:34 scw Exp */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1986, 1990, 1993 * 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. 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. * * from: Utah $Hdr: vmparam.h 1.16 91/01/18$ * * @(#)vmparam.h 8.2 (Berkeley) 4/19/94 */ #ifndef _NEXT68K_VMPARAM_H_ #define _NEXT68K_VMPARAM_H_ /* * Machine dependent constants for NEXT68K */ /* * 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 /* Must equal __LDPGSZ */ #define USRSTACK (-HIGHPAGES*NBPG) /* Start of user stack */ #define BTOPUSRSTACK (0x100000-HIGHPAGES) /* btop(USRSTACK) */ #define P1PAGES 0x100000 #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 (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 /* * Sizes of the system and user portions of the system page table. */ /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */ #define SYSPTSIZE (2 * NPTEPG) /* 8mb */ #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 /* * Boundary at which to place first MAPMEM segment if not explicitly * specified. Should be a power of two. This allows some slop for * the data segment to grow underneath the first mapped segment. */ #define MMSEG 0x200000 /* * The size of the clock loop. */ #define LOOPPAGES (maxfree - firstfree) /* * 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. * Update: memory prices have changed recently (9/96). At the current * value of $6 per megabyte, we lend each swapped in process memory worth * $0.15, or just admit that we don't consider it worthwhile and swap it out * to disk which costs $0.20/MB, or just under half a cent. */ #define SAFERSS 4 /* nominal ``small'' resident set size protected against replacement */ /* * DISKRPM is used to estimate the number of paging i/o operations * which one can expect from a single disk controller. */ #define DISKRPM 60 /* * Klustering constants. Klustering is the gathering * of pages together for pagein/pageout, while clustering * is the treatment of hardware page size as though it were * larger than it really is. * * KLMAX gives maximum cluster size in CLSIZE page (cluster-page) * units. Note that ctod(KLMAX*CLSIZE) must be <= DMMIN in dmap.h. * ctob(KLMAX) should also be less than MAXPHYS (in vm_swp.c) * unless you like "big push" panics. */ #define KLMAX (4/CLSIZE) #define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */ #define KLIN (4/CLSIZE) /* default data/stack in klust */ #define KLTXT (4/CLSIZE) /* default text in klust */ #define KLOUT (4/CLSIZE) /* * KLSDIST is the advance or retard of the fifo reclaim for sequential * processes data space. */ #define KLSDIST 3 /* klusters advance/retard for seq. fifo */ /* * Paging thresholds (see vm_sched.c). * Strategy of 1/19/85: * lotsfree is 512k bytes, but at most 1/4 of memory * desfree is 200k bytes, but at most 1/8 of memory */ #define LOTSFREE (512 * 1024) #define LOTSFREEFRACT 4 #define DESFREE (200 * 1024) #define DESFREEFRACT 8 /* * 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 /* * Mach derived constants */ /* user/kernel map constants */ #define VM_MIN_ADDRESS ((vaddr_t)0) #define VM_MAXUSER_ADDRESS ((vaddr_t)0xFFF00000) #define VM_MAX_ADDRESS ((vaddr_t)0xFFF00000) #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0) #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0xFFFFF000) /* 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) /* # of kernel PT pages (initial only, can grow dynamically) */ #define VM_KERNEL_PT_PAGES ((vsize_t)2) /* XXX: SYSPTSIZE */ /* pcb base */ #define pcbb(p) ((u_int)(p)->p_addr) /* Use new VM page bootstrap interface. */ #define MACHINE_NEW_NONCONTIG #if 0 /* * Constants which control the way the VM system deals with memory segments. * The mvme68k port has two physical memory segments: 1 for onboard RAM * and another for contiguous VMEbus RAM. */ #define VM_PHYSSEG_MAX 2 #define VM_PHYSSEG_STRAT VM_PSTRAT_RANDOM #define VM_PHYSSEG_NOADD #define VM_NFREELIST 2 #define VM_FREELIST_DEFAULT 0 #define VM_FREELIST_VMEMEM 1 #else /* @@@ check and verify these, also get values from seglist.h */ #define VM_PHYSSEG_MAX 5 #define VM_PHYSSEG_STRAT VM_PSTRAT_RANDOM #define VM_PHYSSEG_NOADD #endif /* * pmap-specific data stored in the vm_physmem[] array. */ struct pmap_physseg { struct pv_entry *pvent; /* pv table for this seg */ char *attrs; /* page attributes for this seg */ }; #endif /* _MVME68K_VMPARAM_H_ */