1 /* $NetBSD: vmparam3.h,v 1.30 2001/07/03 05:17:13 chs Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Gordon W. Ross 5 * Copyright (c) 1993 Adam Glass 6 * Copyright (c) 1988 University of Utah. 7 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * the Systems Programming Group of the University of Utah Computer 12 * Science Department. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * from: Utah $Hdr: vmparam.h 1.16 91/01/18$ 43 * from: @(#)vmparam.h 7.3 (Berkeley) 5/7/91 44 * vmparam.h,v 1.2 1993/05/22 07:58:38 cgd Exp 45 */ 46 47 /* 48 * Machine dependent constants for Sun3 49 * 50 * The Sun3 has limited total kernel virtual space (32MB) and 51 * can not use main memory for page tables. (All active PTEs 52 * must be installed in special translation RAM in the MMU). 53 * Therefore, parameters that would normally configure the 54 * size of various page tables are irrelevant. Only things 55 * that consume portions of kernel virtual (KV) space matter, 56 * and those things should be chosen to conserve KV space. 57 */ 58 59 /* 60 * USRTEXT is the start of the user text/data space, while 61 * USRSTACK is the top (end) of the user stack. 62 */ 63 #define USRTEXT NBPG /* Start of user text */ 64 #define USRSTACK KERNBASE /* High end of user stack */ 65 66 /* 67 * Virtual memory related constants, all in bytes. 68 * The Sun3 has only 224 MB of user-virtual space, 69 * so we need to be conservative with these limits. 70 */ 71 #ifndef MAXTSIZ 72 #define MAXTSIZ (8*1024*1024) /* max text size */ 73 #endif 74 #ifndef DFLDSIZ 75 #define DFLDSIZ (16*1024*1024) /* initial data size limit */ 76 #endif 77 #ifndef MAXDSIZ 78 #define MAXDSIZ (32*1024*1024) /* max data size */ 79 #endif 80 #ifndef DFLSSIZ 81 #define DFLSSIZ (512*1024) /* initial stack size limit */ 82 #endif 83 #ifndef MAXSSIZ 84 #define MAXSSIZ MAXDSIZ /* max stack size */ 85 #endif 86 87 /* 88 * PTEs for mapping user space into the kernel for phyio operations. 89 * The actual limitation for physio requests will be the DVMA space, 90 * and that is fixed by hardware design at 1MB. We could make the 91 * physio map larger than that, but it would not buy us much. 92 */ 93 #ifndef USRIOSIZE 94 #define USRIOSIZE 128 /* 1 MB */ 95 #endif 96 97 /* 98 * PTEs for system V style shared memory. 99 * This is basically slop for kmempt which we actually allocate (malloc) from. 100 */ 101 #ifndef SHMMAXPGS 102 #define SHMMAXPGS 512 /* 4 MB */ 103 #endif 104 105 #define PAGER_MAP_SIZE (4 * 1024 * 1024) 106