vmparam.h revision 1.11
1 /* $NetBSD: vmparam.h,v 1.11 1998/07/08 04:35:24 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1992, 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 and Ralph Campbell. 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) 4/22/94 43 */ 44 45 #ifndef _ALPHA_VMPARAM_H_ 46 #define _ALPHA_VMPARAM_H_ 47 48 /* 49 * Machine dependent constants for Alpha. 50 */ 51 52 /* 53 * USRTEXT is the start of the user text/data space, while USRSTACK 54 * is the top (end) of the user stack. Immediately above the user stack 55 * resides the user structure, which is UPAGES long and contains the 56 * kernel stack. 57 * 58 * Digital UNIX (formerly DEC OSF/1) places the stack below the 59 * text segment (i.e. growing downward from 4G). We may want to 60 * consider doing that at some point, but it might require changes 61 * to the exec code. 62 */ 63 #define USRTEXT CLBYTES 64 #define USRSTACK ((vm_offset_t)0x0000000200000000) /* 8G */ 65 66 /* 67 * Virtual memory related constants, all in bytes 68 */ 69 #ifndef MAXTSIZ 70 #define MAXTSIZ (1<<30) /* max text size (1G) */ 71 #endif 72 #ifndef DFLDSIZ 73 #define DFLDSIZ (1<<27) /* initial data size (128M) */ 74 #endif 75 #ifndef MAXDSIZ 76 #define MAXDSIZ (1<<30) /* max data size (1G) */ 77 #endif 78 #ifndef DFLSSIZ 79 #define DFLSSIZ (1<<21) /* initial stack size (2M) */ 80 #endif 81 #ifndef MAXSSIZ 82 #define MAXSSIZ (1<<25) /* max stack size (32M) */ 83 #endif 84 85 /* 86 * PTEs for mapping user space into the kernel for phyio operations. 87 * 64 pte's are enough to cover 8 disks * MAXBSIZE. 88 */ 89 #ifndef USRIOSIZE 90 #define USRIOSIZE 64 91 #endif 92 93 /* 94 * PTEs for system V style shared memory. 95 * This is basically slop for kmempt which we actually allocate (malloc) from. 96 */ 97 #ifndef SHMMAXPGS 98 #define SHMMAXPGS 1024 /* 8mb */ 99 #endif 100 101 /* 102 * Boundary at which to place first MAPMEM segment if not explicitly 103 * specified. Should be a power of two. This allows some slop for 104 * the data segment to grow underneath the first mapped segment. 105 */ 106 #define MMSEG 0x200000 107 108 /* 109 * The size of the clock loop. 110 */ 111 #define LOOPPAGES (maxfree - firstfree) 112 113 /* 114 * The time for a process to be blocked before being very swappable. 115 * This is a number of seconds which the system takes as being a non-trivial 116 * amount of real time. You probably shouldn't change this; 117 * it is used in subtle ways (fractions and multiples of it are, that is, like 118 * half of a ``long time'', almost a long time, etc.) 119 * It is related to human patience and other factors which don't really 120 * change over time. 121 */ 122 #define MAXSLP 20 123 124 /* 125 * A swapped in process is given a small amount of core without being bothered 126 * by the page replacement algorithm. Basically this says that if you are 127 * swapped in you deserve some resources. We protect the last SAFERSS 128 * pages against paging and will just swap you out rather than paging you. 129 * Note that each process has at least UPAGES+CLSIZE pages which are not 130 * paged anyways, in addition to SAFERSS. 131 */ 132 #define SAFERSS 10 /* nominal ``small'' resident set size 133 protected against replacement */ 134 135 /* 136 * Mach derived constants 137 */ 138 139 /* user/kernel map constants */ 140 #define VM_MIN_ADDRESS ((vm_offset_t)ALPHA_USEG_BASE) /* 0 */ 141 #define VM_MAXUSER_ADDRESS ((vm_offset_t)(ALPHA_USEG_END + 1L)) /* 4T */ 142 #define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS 143 #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)ALPHA_K1SEG_BASE) 144 #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)ALPHA_K1SEG_END) 145 146 /* virtual sizes (bytes) for various kernel submaps */ 147 #define _VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) 148 #define _VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES) 149 #define _VM_PHYS_SIZE (USRIOSIZE*CLBYTES) 150 151 #ifndef _KERNEL 152 #define VM_MBUF_SIZE _VM_MBUF_SIZE 153 #define VM_KMEM_SIZE _VM_KMEM_SIZE 154 #define VM_PHYS_SIZE _VM_PHYS_SIZE 155 #else 156 extern u_int32_t vm_mbuf_size, vm_kmem_size, vm_phys_size; 157 #define VM_MBUF_SIZE vm_mbuf_size 158 #define VM_KMEM_SIZE vm_kmem_size 159 #define VM_PHYS_SIZE vm_phys_size 160 #endif /* _KERNEL */ 161 162 /* some Alpha-specific constants */ 163 #define VPTBASE ((vm_offset_t)0xfffffffc00000000) /* Virt. pg table */ 164 165 /* Use new non-contiguous physical memory code. */ 166 #define MACHINE_NEW_NONCONTIG 167 168 #define VM_PHYSSEG_MAX 16 /* XXX */ 169 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 170 #define VM_PHYSSEG_NOADD /* no more after vm_mem_init */ 171 172 #define VM_NFREELIST 1 173 #define VM_FREELIST_DEFAULT 0 174 175 /* 176 * pmap-specific data stored in the vm_physmem[] array. 177 */ 178 struct pmap_physseg { 179 struct pv_head *pvhead; /* pv list of this seg */ 180 }; 181 182 #endif /* ! _ALPHA_VMPARAM_H_ */ 183
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