vmparam.h revision 282065
1131554Stjr/*- 2131554Stjr * Copyright (c) 1990 The Regents of the University of California. 3131554Stjr * All rights reserved. 4131554Stjr * Copyright (c) 1994 John S. Dyson 5131554Stjr * All rights reserved. 6131554Stjr * 7131554Stjr * This code is derived from software contributed to Berkeley by 8131554Stjr * William Jolitz. 9131554Stjr * 10131554Stjr * Redistribution and use in source and binary forms, with or without 11131554Stjr * modification, are permitted provided that the following conditions 12131554Stjr * are met: 13131554Stjr * 1. Redistributions of source code must retain the above copyright 14131554Stjr * notice, this list of conditions and the following disclaimer. 15131554Stjr * 2. Redistributions in binary form must reproduce the above copyright 16131554Stjr * notice, this list of conditions and the following disclaimer in the 17131554Stjr * documentation and/or other materials provided with the distribution. 18131554Stjr * 4. Neither the name of the University nor the names of its contributors 19131554Stjr * may be used to endorse or promote products derived from this software 20131554Stjr * without specific prior written permission. 21131554Stjr * 22131554Stjr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23131554Stjr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24131554Stjr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25131554Stjr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26131554Stjr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27131554Stjr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28131554Stjr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29131554Stjr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30131554Stjr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31131554Stjr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32131554Stjr * SUCH DAMAGE. 33131554Stjr * 34131554Stjr * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 35131554Stjr * $FreeBSD: stable/10/sys/i386/include/vmparam.h 282065 2015-04-27 08:02:12Z kib $ 36131554Stjr */ 37131554Stjr 38131554Stjr 39131554Stjr#ifndef _MACHINE_VMPARAM_H_ 40131554Stjr#define _MACHINE_VMPARAM_H_ 1 41131554Stjr 42131554Stjr/* 43131554Stjr * Machine dependent constants for 386. 44131554Stjr */ 45131554Stjr 46131554Stjr/* 47131554Stjr * Virtual memory related constants, all in bytes 48131554Stjr */ 49131554Stjr#define MAXTSIZ (128UL*1024*1024) /* max text size */ 50131554Stjr#ifndef DFLDSIZ 51131554Stjr#define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ 52131554Stjr#endif 53131554Stjr#ifndef MAXDSIZ 54131554Stjr#define MAXDSIZ (512UL*1024*1024) /* max data size */ 55131554Stjr#endif 56131554Stjr#ifndef DFLSSIZ 57131554Stjr#define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 58131554Stjr#endif 59131554Stjr#ifndef MAXSSIZ 60131554Stjr#define MAXSSIZ (64UL*1024*1024) /* max stack size */ 61131554Stjr#endif 62131554Stjr#ifndef SGROWSIZ 63131554Stjr#define SGROWSIZ (128UL*1024) /* amount to grow stack */ 64131554Stjr#endif 65131554Stjr 66131554Stjr/* 67131554Stjr * Choose between DENSE and SPARSE based on whether lower execution time or 68131554Stjr * lower kernel address space consumption is desired. Under PAE, kernel 69131554Stjr * address space is often in short supply. 70131554Stjr */ 71131554Stjr#ifdef PAE 72131554Stjr#define VM_PHYSSEG_SPARSE 73131554Stjr#else 74131554Stjr#define VM_PHYSSEG_DENSE 75131554Stjr#endif 76131554Stjr 77131554Stjr/* 78131554Stjr * The number of PHYSSEG entries must be one greater than the number 79131554Stjr * of phys_avail entries because the phys_avail entry that spans the 80131554Stjr * largest physical address that is accessible by ISA DMA is split 81131554Stjr * into two PHYSSEG entries. 82131554Stjr */ 83131554Stjr#define VM_PHYSSEG_MAX 17 84131554Stjr 85131554Stjr/* 86131554Stjr * Create two free page pools. Since the i386 kernel virtual address 87131554Stjr * space does not include a mapping onto the machine's entire physical 88131554Stjr * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 89131554Stjr * pool, VM_FREEPOOL_DEFAULT. 90131554Stjr */ 91131554Stjr#define VM_NFREEPOOL 2 92131554Stjr#define VM_FREEPOOL_CACHE 1 93131554Stjr#define VM_FREEPOOL_DEFAULT 0 94131554Stjr#define VM_FREEPOOL_DIRECT 0 95131554Stjr 96131554Stjr/* 97131554Stjr * Create two free page lists: VM_FREELIST_DEFAULT is for physical 98131554Stjr * pages that are above the largest physical address that is 99131554Stjr * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 100131554Stjr * that are below that address. 101131554Stjr */ 102131554Stjr#define VM_NFREELIST 2 103131554Stjr#define VM_FREELIST_DEFAULT 0 104131554Stjr#define VM_FREELIST_ISADMA 1 105131554Stjr 106131554Stjr/* 107131554Stjr * The largest allocation size is 2MB under PAE and 4MB otherwise. 108131554Stjr */ 109131554Stjr#ifdef PAE 110131554Stjr#define VM_NFREEORDER 10 111131554Stjr#else 112131554Stjr#define VM_NFREEORDER 11 113131554Stjr#endif 114131554Stjr 115131554Stjr/* 116131554Stjr * Enable superpage reservations: 1 level. 117131554Stjr */ 118131554Stjr#ifndef VM_NRESERVLEVEL 119131554Stjr#define VM_NRESERVLEVEL 1 120131554Stjr#endif 121131554Stjr 122131554Stjr/* 123131554Stjr * Level 0 reservations consist of 512 pages when PAE pagetables are 124131554Stjr * used, and 1024 pages otherwise. 125131554Stjr */ 126131554Stjr#ifndef VM_LEVEL_0_ORDER 127131554Stjr#if defined(PAE) || defined(PAE_TABLES) 128131554Stjr#define VM_LEVEL_0_ORDER 9 129131554Stjr#else 130131554Stjr#define VM_LEVEL_0_ORDER 10 131131554Stjr#endif 132131554Stjr#endif 133131554Stjr 134131554Stjr/* 135131554Stjr * Kernel physical load address. 136131554Stjr */ 137131554Stjr#ifndef KERNLOAD 138131554Stjr#if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST) 139131554Stjr#define KERNLOAD 0 140131554Stjr#else 141131554Stjr#define KERNLOAD (1 << PDRSHIFT) 142131554Stjr#endif 143131554Stjr#endif /* !defined(KERNLOAD) */ 144131554Stjr 145131554Stjr/* 146131554Stjr * Virtual addresses of things. Derived from the page directory and 147131554Stjr * page table indexes from pmap.h for precision. 148131554Stjr * Because of the page that is both a PD and PT, it looks a little 149131554Stjr * messy at times, but hey, we'll do anything to save a page :-) 150131554Stjr */ 151131554Stjr 152131554Stjr#ifdef XEN 153131554Stjr#define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START 154131554Stjr#else 155131554Stjr#define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1) 156131554Stjr#endif 157131554Stjr 158131554Stjr#define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 159131554Stjr 160131554Stjr#define KERNBASE VADDR(KPTDI, 0) 161131554Stjr 162131554Stjr#define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 163131554Stjr#define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 164131554Stjr 165131554Stjr#define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0) 166131554Stjr 167131554Stjr#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE) 168131554Stjr#define USRSTACK SHAREDPAGE 169131554Stjr 170131554Stjr#define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 171131554Stjr#define VM_MIN_ADDRESS ((vm_offset_t)0) 172131554Stjr 173131554Stjr/* 174131554Stjr * How many physical pages per kmem arena virtual page. 175131554Stjr */ 176131554Stjr#ifndef VM_KMEM_SIZE_SCALE 177131554Stjr#define VM_KMEM_SIZE_SCALE (3) 178131554Stjr#endif 179131554Stjr 180131554Stjr/* 181131554Stjr * Optional floor (in bytes) on the size of the kmem arena. 182131554Stjr */ 183131554Stjr#ifndef VM_KMEM_SIZE_MIN 184131554Stjr#define VM_KMEM_SIZE_MIN (12 * 1024 * 1024) 185131554Stjr#endif 186131554Stjr 187131554Stjr/* 188131554Stjr * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the 189131554Stjr * kernel map rounded to the nearest multiple of the superpage size. 190131554Stjr */ 191131554Stjr#ifndef VM_KMEM_SIZE_MAX 192131554Stjr#define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 193131554Stjr VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 194131554Stjr#endif 195131554Stjr 196131554Stjr/* initial pagein size of beginning of executable file */ 197131554Stjr#ifndef VM_INITIAL_PAGEIN 198131554Stjr#define VM_INITIAL_PAGEIN 16 199131554Stjr#endif 200131554Stjr 201131554Stjr#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 202131554Stjr 203131554Stjr#ifndef VM_MAX_AUTOTUNE_MAXUSERS 204131554Stjr#define VM_MAX_AUTOTUNE_MAXUSERS 384 205131554Stjr#endif 206131554Stjr 207131554Stjr#endif /* _MACHINE_VMPARAM_H_ */ 208131554Stjr