1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * Copyright (c) 1994 John S. Dyson 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 39 * $Id: vmparam.h,v 1.25 1997/04/07 09:30:22 peter Exp $ 40 */ 41 42 43 #ifndef _MACHINE_VMPARAM_H_ 44 #define _MACHINE_VMPARAM_H_ 1 45 46 /* 47 * Machine dependent constants for 386. 48 */ 49 50 #define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */ 51 52 /* 53 * Virtual memory related constants, all in bytes 54 */ 55 #define MAXTSIZ (16UL*1024*1024) /* max text size */ 56 #ifndef DFLDSIZ 57 #define DFLDSIZ (64UL*1024*1024) /* initial data size limit */ 58 #endif 59 #ifndef MAXDSIZ 60 #define MAXDSIZ (128UL*1024*1024) /* max data size */ 61 #endif 62 #ifndef DFLSSIZ 63 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 64 #endif 65 #ifndef MAXSSIZ 66 #define MAXSSIZ (64UL*1024*1024) /* max stack size */ 67 #endif 68 #ifndef SGROWSIZ 69 #define SGROWSIZ (128UL*1024) /* amount to grow stack */ 70 #endif 71 72 #define USRTEXT (1*PAGE_SIZE) /* base of user text XXX bogus */ 73 74 /* 75 * Size of the Shared Memory Pages page table. 76 */ 77 #ifndef SHMMAXPGS 78 #define SHMMAXPGS 1024 /* XXX until we have more kmap space */ 79 #endif 80 81 /* 82 * The time for a process to be blocked before being very swappable. 83 * This is a number of seconds which the system takes as being a non-trivial 84 * amount of real time. You probably shouldn't change this; 85 * it is used in subtle ways (fractions and multiples of it are, that is, like 86 * half of a ``long time'', almost a long time, etc.) 87 * It is related to human patience and other factors which don't really 88 * change over time. 89 */ 90 #define MAXSLP 20 91 92 93 /* 94 * Virtual addresses of things. Derived from the page directory and 95 * page table indexes from pmap.h for precision. 96 * Because of the page that is both a PD and PT, it looks a little 97 * messy at times, but hey, we'll do anything to save a page :-) 98 */ 99 100 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE, 0) 101 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 102 103 #define KERNBASE VADDR(KPTDI, 0) 104 105 #define KPT_MAX_ADDRESS VADDR(PTDPTDI, KPTDI+NKPT) 106 #define KPT_MIN_ADDRESS VADDR(PTDPTDI, KPTDI) 107 108 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 109 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 110 111 #define VM_MAXUSER_ADDRESS VADDR(UMAXPTDI, UMAXPTEOFF) 112 113 #define USRSTACK VM_MAXUSER_ADDRESS 114 115 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 116 #define VM_MIN_ADDRESS ((vm_offset_t)0) 117 118 /* virtual sizes (bytes) for various kernel submaps */ 119 #ifndef VM_KMEM_SIZE 120 #define VM_KMEM_SIZE (32 * 1024 * 1024) 121 #endif 122 123 #endif /* _MACHINE_VMPARAM_H_ */ 124