vmparam.h revision 1.65
1 /* $NetBSD: vmparam.h,v 1.65 2008/01/06 20:53:06 ad 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91 35 */ 36 37 #ifndef _VMPARAM_H_ 38 #define _VMPARAM_H_ 39 40 #include <sys/tree.h> 41 #include <sys/mutex.h> 42 43 /* 44 * Machine dependent constants for 386. 45 */ 46 47 /* 48 * Page size on the IA-32 is not variable in the traditional sense. 49 * We override the PAGE_* definitions to compile-time constants. 50 */ 51 #define PAGE_SHIFT 12 52 #define PAGE_SIZE (1 << PAGE_SHIFT) 53 #define PAGE_MASK (PAGE_SIZE - 1) 54 55 /* 56 * Virtual address space arrangement. On 386, both user and kernel 57 * share the address space, not unlike the vax. 58 * USRSTACK is the top (end) of the user stack. Immediately above the 59 * user stack is the page table map, and then kernel address space. 60 */ 61 #define USRSTACK VM_MAXUSER_ADDRESS 62 63 /* 64 * Virtual memory related constants, all in bytes 65 */ 66 #define MAXTSIZ (64*1024*1024) /* max text size */ 67 #ifndef DFLDSIZ 68 #define DFLDSIZ (256*1024*1024) /* initial data size limit */ 69 #endif 70 #ifndef MAXDSIZ 71 #define MAXDSIZ (3U*1024*1024*1024) /* max data size */ 72 #endif 73 #ifndef DFLSSIZ 74 #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ 75 #endif 76 #ifndef MAXSSIZ 77 #define MAXSSIZ (64*1024*1024) /* max stack size */ 78 #endif 79 80 /* 81 * IA-32 can't do per-page execute permission, so instead we implement 82 * two executable segments for %cs, one that covers everything and one 83 * that excludes some of the address space (currently just the stack). 84 * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment. 85 */ 86 #define I386_MAX_EXE_ADDR (USRSTACK - MAXSSIZ) 87 88 /* 89 * Size of shared memory map 90 */ 91 #ifndef SHMMAXPGS 92 #define SHMMAXPGS 2048 93 #endif 94 95 /* 96 * Size of User Raw I/O map 97 */ 98 #define USRIOSIZE 300 99 100 /* 101 * Mach derived constants 102 */ 103 104 /* user/kernel map constants */ 105 #define VM_MIN_ADDRESS ((vaddr_t)0) 106 #define VM_MAXUSER_ADDRESS ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT)) 107 #define VM_MAX_ADDRESS \ 108 ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT))) 109 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT)) 110 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_APTE << L2_SHIFT)) 111 112 /* 113 * The address to which unspecified mapping requests default 114 */ 115 #ifdef _KERNEL_OPT 116 #include "opt_uvm.h" 117 #endif 118 #define __USE_TOPDOWN_VM 119 #define VM_DEFAULT_ADDRESS(da, sz) \ 120 trunc_page(USRSTACK - MAXSSIZ - (sz)) 121 122 /* XXX max. amount of KVM to be used by buffers. */ 123 #ifndef VM_MAX_KERNEL_BUF 124 #define VM_MAX_KERNEL_BUF (384 * 1024 * 1024) 125 #endif 126 127 /* virtual sizes (bytes) for various kernel submaps */ 128 #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 129 130 #define VM_PHYSSEG_MAX 10 /* 1 "hole" + 9 free lists */ 131 #define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST 132 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 133 134 #define VM_NFREELIST 2 135 #define VM_FREELIST_DEFAULT 0 136 #define VM_FREELIST_FIRST16 1 137 138 #define __HAVE_VM_PAGE_MD 139 #define VM_MDPAGE_INIT(pg) \ 140 memset(&(pg)->mdpage, 0, sizeof((pg)->mdpage)); \ 141 mutex_init(&(pg)->mdpage.mp_pvhead.pvh_lock, MUTEX_NODEBUG, IPL_VM); \ 142 SPLAY_INIT(&(pg)->mdpage.mp_pvhead.pvh_root); 143 144 struct pv_entry; 145 146 struct pv_head { 147 kmutex_t pvh_lock; /* locks every pv in this tree */ 148 SPLAY_HEAD(pvtree, pv_entry) pvh_root; 149 /* head of tree (locked by pvh_lock) */ 150 }; 151 152 struct vm_page_md { 153 struct pv_head mp_pvhead; 154 struct vm_page *mp_link; 155 int mp_attrs; /* only 2 bits (PG_U and PG_M) are actually used. */ 156 }; 157 158 #endif /* _VMPARAM_H_ */ 159
Indexes created Fri Sep 26 20:09:58 GMT 2025