/* $OpenBSD: vmparam.h,v 1.3 1996/07/29 22:59:31 niklas Exp $ */ /* $NetBSD: vmparam.h,v 1.2 1995/11/23 02:36:46 cgd Exp $ */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1992, 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 and Ralph Campbell. * * 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) 4/22/94 */ /* * Machine dependent constants for Alpha. */ /* * 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 CLBYTES #define USRSTACK VM_MAXUSER_ADDRESS /* * Virtual memory related constants, all in bytes */ #ifndef MAXTSIZ #define MAXTSIZ (1<<30) /* max text size (1G) */ #endif #ifndef DFLDSIZ #define DFLDSIZ (1<<27) /* initial data size (128M) */ #endif #ifndef MAXDSIZ #define MAXDSIZ (1<<30) /* max data size (1G) */ #endif #ifndef DFLSSIZ #define DFLSSIZ (1<<21) /* initial stack size (2M) */ #endif #ifndef MAXSSIZ #define MAXSSIZ (1<<25) /* max stack size (32M) */ #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 */ #ifdef THESE_ARE_WRONG /* * Sizes of the system and user portions of the system page table. */ /* SYSPTSIZE IS SILLY; (really number of buffers for I/O) */ #define SYSPTSIZE 1228 #define USRPTSIZE 1024 #endif /* WRONG */ /* * PTEs for mapping user space into the kernel for phyio operations. * 64 pte's are enough to cover 8 disks * MAXBSIZE. */ #ifndef USRIOSIZE #define USRIOSIZE 64 #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 /* 8mb */ #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. */ #define SAFERSS 4 /* nominal ``small'' resident set size protected against replacement */ #ifdef THESE_ARE_WRONG #define mapin(pte, v, pfnum, prot) \ (*(int *)(pte) = ((pfnum) << PG_SHIFT) | (prot), MachTLBFlushAddr(v)) #endif /* WRONG */ /* * Mach derived constants */ /* user/kernel map constants */ #define VM_MIN_ADDRESS ((vm_offset_t)0x0000000000000000) /* 0 */ #define VM_MAXUSER_ADDRESS ((vm_offset_t)0x0000000200000000) /* 8G */ #define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xfffffe0000000000) #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xffffffffffffffff) /* 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) /* some Alpha-specific constants */ #define VPTBASE ((vm_offset_t)0xfffffffc00000000) /* Virt. pg table */ #ifdef THESE_ARE_WRONG /* pcb base */ #define pcbb(p) ((u_int)(p)->p_addr) #endif /* WRONG */