1 /* $NetBSD: vmparam.h,v 1.45 2001/11/15 18:06:14 soren Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 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 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91 39 */ 40 41 #ifndef _VMPARAM_H_ 42 #define _VMPARAM_H_ 43 44 /* 45 * Machine dependent constants for 386. 46 */ 47 48 /* 49 * Page size on the IA-32 is not variable in the traditional sense. 50 * We override the PAGE_* definitions to compile-time constants. 51 */ 52 #define PAGE_SHIFT 12 53 #define PAGE_SIZE (1 << PAGE_SHIFT) 54 #define PAGE_MASK (PAGE_SIZE - 1) 55 56 /* 57 * Virtual address space arrangement. On 386, both user and kernel 58 * share the address space, not unlike the vax. 59 * USRTEXT is the start of the user text/data space, while USRSTACK 60 * is the top (end) of the user stack. Immediately above the user stack 61 * resides the user structure, which is UPAGES long and contains the 62 * kernel stack. 63 * 64 * Immediately after the user structure is the page table map, and then 65 * kernal address space. 66 */ 67 #define USRTEXT NBPG 68 #define USRSTACK VM_MAXUSER_ADDRESS 69 70 /* 71 * Virtual memory related constants, all in bytes 72 */ 73 #define MAXTSIZ (64*1024*1024) /* max text size */ 74 #ifndef DFLDSIZ 75 #define DFLDSIZ (128*1024*1024) /* initial data size limit */ 76 #endif 77 #ifndef MAXDSIZ 78 #define MAXDSIZ (1*1024*1024*1024) /* max data size */ 79 #endif 80 #ifndef DFLSSIZ 81 #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ 82 #endif 83 #ifndef MAXSSIZ 84 #define MAXSSIZ (32*1024*1024) /* max stack size */ 85 #endif 86 87 /* 88 * Size of shared memory map 89 */ 90 #ifndef SHMMAXPGS 91 #define SHMMAXPGS 2048 92 #endif 93 94 /* 95 * Size of User Raw I/O map 96 */ 97 #define USRIOSIZE 300 98 99 /* 100 * Mach derived constants 101 */ 102 103 /* user/kernel map constants */ 104 #define VM_MIN_ADDRESS ((vaddr_t)0) 105 #define VM_MAXUSER_ADDRESS \ 106 ((vaddr_t)((PDSLOT_PTE << PDSHIFT) - (UPAGES * NBPG))) 107 #define VM_MAX_ADDRESS \ 108 ((vaddr_t)((PDSLOT_PTE << PDSHIFT) + (PDSLOT_PTE << PGSHIFT))) 109 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDSLOT_KERN << PDSHIFT)) 110 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(PDSLOT_APTE << PDSHIFT)) 111 112 /* XXX max. amount of KVM to be used by buffers. */ 113 #ifndef VM_MAX_KERNEL_BUF 114 #define VM_MAX_KERNEL_BUF (384 * 1024 * 1024) 115 #endif 116 117 /* virtual sizes (bytes) for various kernel submaps */ 118 #define VM_PHYS_SIZE (USRIOSIZE*NBPG) 119 120 #define VM_PHYSSEG_MAX 5 /* 1 "hole" + 4 free lists */ 121 #define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST 122 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 123 124 #define VM_NFREELIST 2 125 #define VM_FREELIST_DEFAULT 0 126 #define VM_FREELIST_FIRST16 1 127 128 #define __HAVE_PMAP_PHYSSEG 129 130 /* 131 * pmap specific data stored in the vm_physmem[] array 132 */ 133 struct pmap_physseg { 134 struct pv_head *pvhead; /* pv_head array */ 135 char *attrs; /* attrs array */ 136 }; 137 138 #endif /* _VMPARAM_H_ */ 139