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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 35 * $FreeBSD$ 36 */ 37 38 39 #ifndef _MACHINE_VMPARAM_H_ 40 #define _MACHINE_VMPARAM_H_ 1 41 42 /* 43 * Machine dependent constants for 386. 44 */ 45 46 #define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */ 47 48 /* 49 * Virtual memory related constants, all in bytes 50 */ 51 #define MAXTSIZ (128UL*1024*1024) /* max text size */ 52 #ifndef DFLDSIZ 53 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ 54 #endif 55 #ifndef MAXDSIZ 56 #define MAXDSIZ (512UL*1024*1024) /* max data size */ 57 #endif 58 #ifndef DFLSSIZ 59 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 60 #endif 61 #ifndef MAXSSIZ 62 #define MAXSSIZ (64UL*1024*1024) /* max stack size */ 63 #endif 64 #ifndef SGROWSIZ 65 #define SGROWSIZ (128UL*1024) /* amount to grow stack */ 66 #endif 67 68 #define USRTEXT (1*PAGE_SIZE) /* base of user text XXX bogus */ 69 70 /* 71 * The time for a process to be blocked before being very swappable. 72 * This is a number of seconds which the system takes as being a non-trivial 73 * amount of real time. You probably shouldn't change this; 74 * it is used in subtle ways (fractions and multiples of it are, that is, like 75 * half of a ``long time'', almost a long time, etc.) 76 * It is related to human patience and other factors which don't really 77 * change over time. 78 */ 79 #define MAXSLP 20 80 81 82 /* 83 * Kernel physical load address. 84 */ 85 #ifndef KERNLOAD 86 #define KERNLOAD (1 << PDRSHIFT) 87 #endif 88 89 /* 90 * Virtual addresses of things. Derived from the page directory and 91 * page table indexes from pmap.h for precision. 92 * Because of the page that is both a PD and PT, it looks a little 93 * messy at times, but hey, we'll do anything to save a page :-) 94 */ 95 96 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1) 97 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 98 99 #define KERNBASE VADDR(KPTDI, 0) 100 101 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 102 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 103 104 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0) 105 106 #define USRSTACK VM_MAXUSER_ADDRESS 107 108 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 109 #define VM_MIN_ADDRESS ((vm_offset_t)0) 110 111 /* virtual sizes (bytes) for various kernel submaps */ 112 #ifndef VM_KMEM_SIZE 113 #define VM_KMEM_SIZE (12 * 1024 * 1024) 114 #endif 115 116 /* 117 * How many physical pages per KVA page allocated. 118 * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX) 119 * is the total KVA space allocated for kmem_map. 120 */ 121 #ifndef VM_KMEM_SIZE_SCALE 122 #define VM_KMEM_SIZE_SCALE (3) 123 #endif 124 125 /* 126 * Ceiling on amount of kmem_map kva space. 127 */ 128 #ifndef VM_KMEM_SIZE_MAX 129 #define VM_KMEM_SIZE_MAX (320 * 1024 * 1024) 130 #endif 131 132 /* initial pagein size of beginning of executable file */ 133 #ifndef VM_INITIAL_PAGEIN 134 #define VM_INITIAL_PAGEIN 16 135 #endif 136 137 #endif /* _MACHINE_VMPARAM_H_ */ 138