1 /* $NetBSD: vmparam.h,v 1.51 2003/04/02 07:35:59 thorpej 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 * USRSTACK is the top (end) of the user stack. Immediately above the 60 * user stack is the page table map, and then kernel address space. 61 */ 62 #define USRSTACK VM_MAXUSER_ADDRESS 63 64 /* 65 * Virtual memory related constants, all in bytes 66 */ 67 #define MAXTSIZ (64*1024*1024) /* max text size */ 68 #ifndef DFLDSIZ 69 #define DFLDSIZ (128*1024*1024) /* initial data size limit */ 70 #endif 71 #ifndef MAXDSIZ 72 #define MAXDSIZ (1*1024*1024*1024) /* max data size */ 73 #endif 74 #ifndef DFLSSIZ 75 #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ 76 #endif 77 #ifndef MAXSSIZ 78 #define MAXSSIZ (32*1024*1024) /* max stack size */ 79 #endif 80 81 /* 82 * Size of shared memory map 83 */ 84 #ifndef SHMMAXPGS 85 #define SHMMAXPGS 2048 86 #endif 87 88 /* 89 * Size of User Raw I/O map 90 */ 91 #define USRIOSIZE 300 92 93 /* 94 * Mach derived constants 95 */ 96 97 /* user/kernel map constants */ 98 #define VM_MIN_ADDRESS ((vaddr_t)0) 99 #define VM_MAXUSER_ADDRESS ((vaddr_t)(PDSLOT_PTE << PDSHIFT)) 100 #define VM_MAX_ADDRESS \ 101 ((vaddr_t)((PDSLOT_PTE << PDSHIFT) + (PDSLOT_PTE << PGSHIFT))) 102 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDSLOT_KERN << PDSHIFT)) 103 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(PDSLOT_APTE << PDSHIFT)) 104 105 /* 106 * The address to which unspecified mapping requests default 107 */ 108 #ifdef _KERNEL_OPT 109 #include "opt_uvm.h" 110 #endif 111 #define __HAVE_TOPDOWN_VM 112 #ifdef USE_TOPDOWN_VM 113 #define VM_DEFAULT_ADDRESS(da, sz) \ 114 trunc_page(VM_MAXUSER_ADDRESS - MAXSSIZ - (sz)) 115 #endif 116 117 /* XXX max. amount of KVM to be used by buffers. */ 118 #ifndef VM_MAX_KERNEL_BUF 119 #define VM_MAX_KERNEL_BUF (384 * 1024 * 1024) 120 #endif 121 122 /* virtual sizes (bytes) for various kernel submaps */ 123 #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 124 125 #define VM_PHYSSEG_MAX 5 /* 1 "hole" + 4 free lists */ 126 #define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST 127 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 128 129 #define VM_NFREELIST 2 130 #define VM_FREELIST_DEFAULT 0 131 #define VM_FREELIST_FIRST16 1 132 133 #define __HAVE_PMAP_PHYSSEG 134 135 /* 136 * pmap specific data stored in the vm_physmem[] array 137 */ 138 struct pmap_physseg { 139 struct pv_head *pvhead; /* pv_head array */ 140 char *attrs; /* attrs array */ 141 }; 142 143 #endif /* _VMPARAM_H_ */ 144