vmparam.h revision 266204
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * Copyright (c) 1994 John S. Dyson 5 * All rights reserved. 6 * Copyright (c) 2003 Peter Wemm 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * William Jolitz. 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: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 41 * $FreeBSD: stable/10/sys/amd64/include/vmparam.h 266204 2014-05-16 01:30:30Z ian $ 42 */ 43 44 45#ifndef _MACHINE_VMPARAM_H_ 46#define _MACHINE_VMPARAM_H_ 1 47 48/* 49 * Machine dependent constants for AMD64. 50 */ 51 52/* 53 * Virtual memory related constants, all in bytes 54 */ 55#define MAXTSIZ (128UL*1024*1024) /* max text size */ 56#ifndef DFLDSIZ 57#define DFLDSIZ (32768UL*1024*1024) /* initial data size limit */ 58#endif 59#ifndef MAXDSIZ 60#define MAXDSIZ (32768UL*1024*1024) /* max data size */ 61#endif 62#ifndef DFLSSIZ 63#define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 64#endif 65#ifndef MAXSSIZ 66#define MAXSSIZ (512UL*1024*1024) /* max stack size */ 67#endif 68#ifndef SGROWSIZ 69#define SGROWSIZ (128UL*1024) /* amount to grow stack */ 70#endif 71 72/* 73 * We provide a machine specific single page allocator through the use 74 * of the direct mapped segment. This uses 2MB pages for reduced 75 * TLB pressure. 76 */ 77#define UMA_MD_SMALL_ALLOC 78 79/* 80 * The physical address space is densely populated. 81 */ 82#define VM_PHYSSEG_DENSE 83 84/* 85 * The number of PHYSSEG entries must be one greater than the number 86 * of phys_avail entries because the phys_avail entry that spans the 87 * largest physical address that is accessible by ISA DMA is split 88 * into two PHYSSEG entries. 89 */ 90#define VM_PHYSSEG_MAX 31 91 92/* 93 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool 94 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is 95 * the pool from which physical pages for page tables and small UMA 96 * objects are allocated. 97 */ 98#define VM_NFREEPOOL 3 99#define VM_FREEPOOL_CACHE 2 100#define VM_FREEPOOL_DEFAULT 0 101#define VM_FREEPOOL_DIRECT 1 102 103/* 104 * Create two free page lists: VM_FREELIST_DEFAULT is for physical 105 * pages that are above the largest physical address that is 106 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 107 * that are below that address. 108 */ 109#define VM_NFREELIST 2 110#define VM_FREELIST_DEFAULT 0 111#define VM_FREELIST_ISADMA 1 112 113/* 114 * An allocation size of 16MB is supported in order to optimize the 115 * use of the direct map by UMA. Specifically, a cache line contains 116 * at most 8 PDEs, collectively mapping 16MB of physical memory. By 117 * reducing the number of distinct 16MB "pages" that are used by UMA, 118 * the physical memory allocator reduces the likelihood of both 2MB 119 * page TLB misses and cache misses caused by 2MB page TLB misses. 120 */ 121#define VM_NFREEORDER 13 122 123/* 124 * Enable superpage reservations: 1 level. 125 */ 126#ifndef VM_NRESERVLEVEL 127#define VM_NRESERVLEVEL 1 128#endif 129 130/* 131 * Level 0 reservations consist of 512 pages. 132 */ 133#ifndef VM_LEVEL_0_ORDER 134#define VM_LEVEL_0_ORDER 9 135#endif 136 137#ifdef SMP 138#define PA_LOCK_COUNT 256 139#endif 140 141/* 142 * Virtual addresses of things. Derived from the page directory and 143 * page table indexes from pmap.h for precision. 144 * 145 * 0x0000000000000000 - 0x00007fffffffffff user map 146 * 0x0000800000000000 - 0xffff7fffffffffff does not exist (hole) 147 * 0xffff800000000000 - 0xffff804020100fff recursive page table (512GB slot) 148 * 0xffff804020101000 - 0xfffff7ffffffffff unused 149 * 0xfffff80000000000 - 0xfffffbffffffffff 4TB direct map 150 * 0xfffffc0000000000 - 0xfffffdffffffffff unused 151 * 0xfffffe0000000000 - 0xffffffffffffffff 2TB kernel map 152 * 153 * Within the kernel map: 154 * 155 * 0xffffffff80000000 KERNBASE 156 */ 157 158#define VM_MIN_KERNEL_ADDRESS KVADDR(KPML4BASE, 0, 0, 0) 159#define VM_MAX_KERNEL_ADDRESS KVADDR(KPML4BASE + NKPML4E - 1, \ 160 NPDPEPG-1, NPDEPG-1, NPTEPG-1) 161 162#define DMAP_MIN_ADDRESS KVADDR(DMPML4I, 0, 0, 0) 163#define DMAP_MAX_ADDRESS KVADDR(DMPML4I + NDMPML4E, 0, 0, 0) 164 165#define KERNBASE KVADDR(KPML4I, KPDPI, 0, 0) 166 167#define UPT_MAX_ADDRESS KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I) 168#define UPT_MIN_ADDRESS KVADDR(PML4PML4I, 0, 0, 0) 169 170#define VM_MAXUSER_ADDRESS UVADDR(NUPML4E, 0, 0, 0) 171 172#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 173#define USRSTACK SHAREDPAGE 174 175#define VM_MAX_ADDRESS UPT_MAX_ADDRESS 176#define VM_MIN_ADDRESS (0) 177 178#define PHYS_TO_DMAP(x) ((x) | DMAP_MIN_ADDRESS) 179#define DMAP_TO_PHYS(x) ((x) & ~DMAP_MIN_ADDRESS) 180 181/* 182 * How many physical pages per kmem arena virtual page. 183 */ 184#ifndef VM_KMEM_SIZE_SCALE 185#define VM_KMEM_SIZE_SCALE (1) 186#endif 187 188/* 189 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the 190 * kernel map. 191 */ 192#ifndef VM_KMEM_SIZE_MAX 193#define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \ 194 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5) 195#endif 196 197/* initial pagein size of beginning of executable file */ 198#ifndef VM_INITIAL_PAGEIN 199#define VM_INITIAL_PAGEIN 16 200#endif 201 202#define ZERO_REGION_SIZE (2 * 1024 * 1024) /* 2MB */ 203 204#endif /* _MACHINE_VMPARAM_H_ */ 205