1 /* $OpenBSD: vmparam.h,v 1.7 2001/06/27 06:19:42 art Exp $ */ 2 /* $NetBSD: vmparam.h,v 1.18 2000/05/22 17:13:54 thorpej Exp $ */ 3 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 #ifndef _ALPHA_VMPARAM_H_ 47 #define _ALPHA_VMPARAM_H_ 48 49 /* 50 * Machine dependent constants for Alpha. 51 */ 52 53 /* 54 * USRTEXT is the start of the user text/data space, while USRSTACK 55 * is the top (end) of the user stack. Immediately above the user stack 56 * resides the user structure, which is UPAGES long and contains the 57 * kernel stack. 58 * 59 * Digital UNIX (formerly DEC OSF/1) places the stack below the 60 * text segment (i.e. growing downward from 4G). We may want to 61 * consider doing that at some point, but it might require changes 62 * to the exec code. 63 */ 64 #define USRTEXT NBPG 65 #define USRSTACK ((vaddr_t)0x0000000200000000) /* 8G */ 66 67 /* 68 * Virtual memory related constants, all in bytes 69 */ 70 #ifndef MAXTSIZ 71 #define MAXTSIZ (1<<30) /* max text size (1G) */ 72 #endif 73 #ifndef DFLDSIZ 74 #define DFLDSIZ (1<<27) /* initial data size (128M) */ 75 #endif 76 #ifndef MAXDSIZ 77 #define MAXDSIZ (1<<30) /* max data size (1G) */ 78 #endif 79 #ifndef DFLSSIZ 80 #define DFLSSIZ (1<<21) /* initial stack size (2M) */ 81 #endif 82 #ifndef MAXSSIZ 83 #define MAXSSIZ (1<<25) /* max stack size (32M) */ 84 #endif 85 86 /* 87 * PTEs for mapping user space into the kernel for phyio operations. 88 * 64 pte's are enough to cover 8 disks * MAXBSIZE. 89 */ 90 #ifndef USRIOSIZE 91 #define USRIOSIZE 64 92 #endif 93 94 /* 95 * PTEs for system V style shared memory. 96 * This is basically slop for kmempt which we actually allocate (malloc) from. 97 */ 98 #ifndef SHMMAXPGS 99 #define SHMMAXPGS 1024 /* 8mb */ 100 #endif 101 102 /* 103 * The time for a process to be blocked before being very swappable. 104 * This is a number of seconds which the system takes as being a non-trivial 105 * amount of real time. You probably shouldn't change this; 106 * it is used in subtle ways (fractions and multiples of it are, that is, like 107 * half of a ``long time'', almost a long time, etc.) 108 * It is related to human patience and other factors which don't really 109 * change over time. 110 */ 111 #define MAXSLP 20 112 113 /* 114 * Mach derived constants 115 */ 116 117 /* user/kernel map constants */ 118 #define VM_MIN_ADDRESS ((vaddr_t)ALPHA_USEG_BASE) /* 0 */ 119 #define VM_MAXUSER_ADDRESS ((vaddr_t)(ALPHA_USEG_END + 1L)) /* 4T */ 120 #define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS 121 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)ALPHA_K1SEG_BASE) 122 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)ALPHA_K1SEG_END) 123 124 /* virtual sizes (bytes) for various kernel submaps */ 125 #define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) 126 #define VM_KMEM_SIZE (NKMEMCLUSTERS*NBPG) 127 #define VM_PHYS_SIZE (USRIOSIZE*NBPG) 128 129 /* some Alpha-specific constants */ 130 #define VPTBASE ((vaddr_t)0xfffffffc00000000) /* Virt. pg table */ 131 132 #define VM_PHYSSEG_MAX 16 /* XXX */ 133 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 134 #define VM_PHYSSEG_NOADD /* no more after vm_mem_init */ 135 136 #define VM_NFREELIST 1 137 #define VM_FREELIST_DEFAULT 0 138 139 /* 140 * pmap-specific data stored in the vm_physmem[] array. 141 */ 142 struct pmap_physseg { 143 struct pv_head *pvhead; /* pv list of this seg */ 144 }; 145 146 #endif /* ! _ALPHA_VMPARAM_H_ */ 147