vmparam.h revision 1.6
1 /* $NetBSD: vmparam.h,v 1.6 1997/09/23 23:23:23 mjacob Exp $ */ 2 #ifndef _ALPHA_VMPARAM_H 3 #define _ALPHA_VMPARAM_H 4 /* 5 * Copyright (c) 1988 University of Utah. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * the Systems Programming Group of the University of Utah Computer 11 * Science Department and Ralph Campbell. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * from: Utah $Hdr: vmparam.h 1.16 91/01/18$ 42 * 43 * @(#)vmparam.h 8.2 (Berkeley) 4/22/94 44 */ 45 46 /* 47 * Machine dependent constants for Alpha. 48 */ 49 /* 50 * USRTEXT is the start of the user text/data space, while USRSTACK 51 * is the top (end) of the user stack. Immediately above the user stack 52 * resides the user structure, which is UPAGES long and contains the 53 * kernel stack. 54 */ 55 #define USRTEXT CLBYTES 56 #define USRSTACK VM_MAXUSER_ADDRESS 57 58 /* 59 * Virtual memory related constants, all in bytes 60 */ 61 #ifndef MAXTSIZ 62 #define MAXTSIZ (1<<30) /* max text size (1G) */ 63 #endif 64 #ifndef DFLDSIZ 65 #define DFLDSIZ (1<<27) /* initial data size (128M) */ 66 #endif 67 #ifndef MAXDSIZ 68 #define MAXDSIZ (1<<30) /* max data size (1G) */ 69 #endif 70 #ifndef DFLSSIZ 71 #define DFLSSIZ (1<<21) /* initial stack size (2M) */ 72 #endif 73 #ifndef MAXSSIZ 74 #define MAXSSIZ (1<<25) /* max stack size (32M) */ 75 #endif 76 77 /* 78 * PTEs for mapping user space into the kernel for phyio operations. 79 * 64 pte's are enough to cover 8 disks * MAXBSIZE. 80 */ 81 #ifndef USRIOSIZE 82 #define USRIOSIZE 64 83 #endif 84 85 /* 86 * PTEs for system V style shared memory. 87 * This is basically slop for kmempt which we actually allocate (malloc) from. 88 */ 89 #ifndef SHMMAXPGS 90 #define SHMMAXPGS 1024 /* 8mb */ 91 #endif 92 93 /* 94 * Boundary at which to place first MAPMEM segment if not explicitly 95 * specified. Should be a power of two. This allows some slop for 96 * the data segment to grow underneath the first mapped segment. 97 */ 98 #define MMSEG 0x200000 99 100 /* 101 * The size of the clock loop. 102 */ 103 #define LOOPPAGES (maxfree - firstfree) 104 105 /* 106 * The time for a process to be blocked before being very swappable. 107 * This is a number of seconds which the system takes as being a non-trivial 108 * amount of real time. You probably shouldn't change this; 109 * it is used in subtle ways (fractions and multiples of it are, that is, like 110 * half of a ``long time'', almost a long time, etc.) 111 * It is related to human patience and other factors which don't really 112 * change over time. 113 */ 114 #define MAXSLP 20 115 116 /* 117 * A swapped in process is given a small amount of core without being bothered 118 * by the page replacement algorithm. Basically this says that if you are 119 * swapped in you deserve some resources. We protect the last SAFERSS 120 * pages against paging and will just swap you out rather than paging you. 121 * Note that each process has at least UPAGES+CLSIZE pages which are not 122 * paged anyways, in addition to SAFERSS. 123 */ 124 #define SAFERSS 10 /* nominal ``small'' resident set size 125 protected against replacement */ 126 127 /* 128 * Mach derived constants 129 */ 130 131 /* user/kernel map constants */ 132 #define VM_MIN_ADDRESS ((vm_offset_t)ALPHA_USEG_BASE) /* 0 */ 133 #define VM_MAXUSER_ADDRESS ((vm_offset_t)0x0000000200000000) /* 8G XXX */ 134 #define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS 135 #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)ALPHA_K1SEG_BASE) 136 #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)ALPHA_K1SEG_END) 137 138 /* virtual sizes (bytes) for various kernel submaps */ 139 #ifndef _KERNEL 140 #define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) 141 #define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES) 142 #define VM_PHYS_SIZE (USRIOSIZE*CLBYTES) 143 #else 144 extern u_int32_t vm_mbuf_size, vm_kmem_size, vm_phys_size; 145 #define VM_MBUF_SIZE vm_mbuf_size 146 #define VM_KMEM_SIZE vm_kmem_size 147 #define VM_PHYS_SIZE vm_phys_size 148 #endif 149 150 /* some Alpha-specific constants */ 151 #define VPTBASE ((vm_offset_t)0xfffffffc00000000) /* Virt. pg table */ 152 #endif /* !_ALPHA_VMPARAM_H */ 153
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