vmparam.h revision 1.5
1/* $NetBSD: vmparam.h,v 1.5 2000/12/01 17:57:44 tsutsui Exp $ */ 2 3/* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1986, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: Utah $Hdr: vmparam.h 1.16 91/01/18$ 41 * 42 * @(#)vmparam.h 8.2 (Berkeley) 4/19/94 43 */ 44 45#ifndef _NEWS68K_VMPARAM_H_ 46#define _NEWS68K_VMPARAM_H_ 47 48/* 49 * Machine dependent constants for news68k 50 */ 51 52/* 53 * We use 4K pages on the news68k. Override the PAGE_* definitions 54 * to be compile time constants. 55 */ 56#define PAGE_SHIFT 12 57#define PAGE_SIZE (1 << PAGE_SHIFT) 58#define PAGE_MASK (PAGE_SIZE - 1) 59 60/* 61 * USRTEXT is the start of the user text/data space, while USRSTACK 62 * is the top (end) of the user stack. LOWPAGES and HIGHPAGES are 63 * the number of pages from the beginning of the P0 region to the 64 * beginning of the text and from the beginning of the P1 region to the 65 * beginning of the stack respectively. 66 * 67 * NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3) 68 * is for HPUX compatibility. Why?? Because HPUX's debuggers 69 * have the user's stack hard-wired at FFF00000 for post-mortems, 70 * and we must be compatible... 71 */ 72#define USRTEXT 8192 /* Must equal __LDPGSZ */ 73#define USRSTACK (-HIGHPAGES*NBPG) /* Start of user stack */ 74#define BTOPUSRSTACK (0x100000-HIGHPAGES) /* btop(USRSTACK) */ 75#define P1PAGES 0x100000 76#define LOWPAGES 0 77#define HIGHPAGES (0x100000/NBPG) 78 79/* 80 * Virtual memory related constants, all in bytes 81 */ 82#ifndef MAXTSIZ 83#define MAXTSIZ (8*1024*1024) /* max text size */ 84#endif 85#ifndef DFLDSIZ 86#define DFLDSIZ (16*1024*1024) /* initial data size limit */ 87#endif 88#ifndef MAXDSIZ 89#define MAXDSIZ (64*1024*1024) /* max data size */ 90#endif 91#ifndef DFLSSIZ 92#define DFLSSIZ (512*1024) /* initial stack size limit */ 93#endif 94#ifndef MAXSSIZ 95#define MAXSSIZ MAXDSIZ /* max stack size */ 96#endif 97 98/* 99 * Sizes of the system and user portions of the system page table. 100 */ 101/* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */ 102#define SYSPTSIZE (2 * NPTEPG) /* 8mb */ 103#define USRPTSIZE (1 * NPTEPG) /* 4mb */ 104 105/* 106 * PTEs for mapping user space into the kernel for phyio operations. 107 * One page is enough to handle 4Mb of simultaneous raw IO operations. 108 */ 109#ifndef USRIOSIZE 110#define USRIOSIZE (1 * NPTEPG) /* 4mb */ 111#endif 112 113/* 114 * PTEs for system V style shared memory. 115 * This is basically slop for kmempt which we actually allocate (malloc) from. 116 */ 117#ifndef SHMMAXPGS 118#define SHMMAXPGS 1024 /* 4mb */ 119#endif 120 121/* 122 * The time for a process to be blocked before being very swappable. 123 * This is a number of seconds which the system takes as being a non-trivial 124 * amount of real time. You probably shouldn't change this; 125 * it is used in subtle ways (fractions and multiples of it are, that is, like 126 * half of a ``long time'', almost a long time, etc.) 127 * It is related to human patience and other factors which don't really 128 * change over time. 129 */ 130#define MAXSLP 20 131 132/* 133 * Mach derived constants 134 */ 135 136/* user/kernel map constants */ 137#define VM_MIN_ADDRESS ((vaddr_t)0) 138#define VM_MAXUSER_ADDRESS ((vaddr_t)0xFFF00000) 139#define VM_MAX_ADDRESS ((vaddr_t)0xFFF00000) 140#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0) 141#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0xFFFFF000) 142 143/* virtual sizes (bytes) for various kernel submaps */ 144#define VM_PHYS_SIZE (USRIOSIZE*NBPG) 145 146/* # of kernel PT pages (initial only, can grow dynamically) */ 147#define VM_KERNEL_PT_PAGES ((vsize_t)2) /* XXX: SYSPTSIZE */ 148 149/* 150 * Constants which control the way the VM system deals with memory segments. 151 * The news68k only has one physical memory segment? 152 */ 153#define VM_PHYSSEG_MAX 1 154#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 155#define VM_PHYSSEG_NOADD 156 157#define VM_NFREELIST 1 158#define VM_FREELIST_DEFAULT 0 159 160/* 161 * pmap-specific data stored in the vm_physmem[] array. 162 */ 163struct pmap_physseg { 164 struct pv_entry *pvent; /* pv table for this seg */ 165 char *attrs; /* page attributes for this seg */ 166}; 167 168#endif /* _NEWS68K_VMPARAM_H_ */ 169