vmparam.h revision 228398
1238405Sjkim/*- 2299389Sjkim * Copyright (c) 1990 The Regents of the University of California. 3299389Sjkim * All rights reserved. 4238405Sjkim * Copyright (c) 1994 John S. Dyson 5238405Sjkim * All rights reserved. 6238405Sjkim * 7238405Sjkim * This code is derived from software contributed to Berkeley by 8238405Sjkim * William Jolitz. 9238405Sjkim * 10238405Sjkim * Redistribution and use in source and binary forms, with or without 11238405Sjkim * modification, are permitted provided that the following conditions 12238405Sjkim * are met: 13238405Sjkim * 1. Redistributions of source code must retain the above copyright 14238405Sjkim * notice, this list of conditions and the following disclaimer. 15238405Sjkim * 2. Redistributions in binary form must reproduce the above copyright 16238405Sjkim * notice, this list of conditions and the following disclaimer in the 17238405Sjkim * documentation and/or other materials provided with the distribution. 18238405Sjkim * 4. Neither the name of the University nor the names of its contributors 19238405Sjkim * may be used to endorse or promote products derived from this software 20238405Sjkim * without specific prior written permission. 21238405Sjkim * 22238405Sjkim * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23238405Sjkim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24238405Sjkim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25238405Sjkim * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26238405Sjkim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27238405Sjkim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28238405Sjkim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29238405Sjkim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30238405Sjkim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31238405Sjkim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32238405Sjkim * SUCH DAMAGE. 33238405Sjkim * 34238405Sjkim * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91 35238405Sjkim * $FreeBSD: head/sys/i386/include/vmparam.h 228398 2011-12-10 18:42:00Z alc $ 36238405Sjkim */ 37238405Sjkim 38238405Sjkim 39238405Sjkim#ifndef _MACHINE_VMPARAM_H_ 40238405Sjkim#define _MACHINE_VMPARAM_H_ 1 41238405Sjkim 42238405Sjkim/* 43238405Sjkim * Machine dependent constants for 386. 44238405Sjkim */ 45238405Sjkim 46238405Sjkim/* 47238405Sjkim * Virtual memory related constants, all in bytes 48238405Sjkim */ 49238405Sjkim#define MAXTSIZ (128UL*1024*1024) /* max text size */ 50238405Sjkim#ifndef DFLDSIZ 51238405Sjkim#define DFLDSIZ (128UL*1024*1024) /* initial data size limit */ 52238405Sjkim#endif 53238405Sjkim#ifndef MAXDSIZ 54238405Sjkim#define MAXDSIZ (512UL*1024*1024) /* max data size */ 55238405Sjkim#endif 56238405Sjkim#ifndef DFLSSIZ 57238405Sjkim#define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */ 58238405Sjkim#endif 59238405Sjkim#ifndef MAXSSIZ 60238405Sjkim#define MAXSSIZ (64UL*1024*1024) /* max stack size */ 61238405Sjkim#endif 62238405Sjkim#ifndef SGROWSIZ 63238405Sjkim#define SGROWSIZ (128UL*1024) /* amount to grow stack */ 64238405Sjkim#endif 65238405Sjkim 66238405Sjkim/* 67238405Sjkim * The physical address space is densely populated. 68238405Sjkim */ 69238405Sjkim#define VM_PHYSSEG_DENSE 70238405Sjkim 71238405Sjkim/* 72238405Sjkim * The number of PHYSSEG entries must be one greater than the number 73238405Sjkim * of phys_avail entries because the phys_avail entry that spans the 74238405Sjkim * largest physical address that is accessible by ISA DMA is split 75238405Sjkim * into two PHYSSEG entries. 76238405Sjkim */ 77238405Sjkim#define VM_PHYSSEG_MAX 17 78290207Sjkim 79238405Sjkim/* 80238405Sjkim * Create two free page pools. Since the i386 kernel virtual address 81238405Sjkim * space does not include a mapping onto the machine's entire physical 82238405Sjkim * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default 83290207Sjkim * pool, VM_FREEPOOL_DEFAULT. 84238405Sjkim */ 85290207Sjkim#define VM_NFREEPOOL 2 86238405Sjkim#define VM_FREEPOOL_CACHE 1 87290207Sjkim#define VM_FREEPOOL_DEFAULT 0 88238405Sjkim#define VM_FREEPOOL_DIRECT 0 89238405Sjkim 90238405Sjkim/* 91238405Sjkim * Create two free page lists: VM_FREELIST_DEFAULT is for physical 92290207Sjkim * pages that are above the largest physical address that is 93238405Sjkim * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages 94290207Sjkim * that are below that address. 95238405Sjkim */ 96290207Sjkim#define VM_NFREELIST 2 97238405Sjkim#define VM_FREELIST_DEFAULT 0 98290207Sjkim#define VM_FREELIST_ISADMA 1 99238405Sjkim 100238405Sjkim/* 101290207Sjkim * The largest allocation size is 2MB under PAE and 4MB otherwise. 102238405Sjkim */ 103290207Sjkim#ifdef PAE 104238405Sjkim#define VM_NFREEORDER 10 105238405Sjkim#else 106238405Sjkim#define VM_NFREEORDER 11 107238405Sjkim#endif 108238405Sjkim 109238405Sjkim/* 110238405Sjkim * Only one memory domain. 111238405Sjkim */ 112238405Sjkim#ifndef VM_NDOMAIN 113290207Sjkim#define VM_NDOMAIN 1 114238405Sjkim#endif 115238405Sjkim 116238405Sjkim/* 117290207Sjkim * Enable superpage reservations: 1 level. 118238405Sjkim */ 119238405Sjkim#ifndef VM_NRESERVLEVEL 120238405Sjkim#define VM_NRESERVLEVEL 1 121238405Sjkim#endif 122290207Sjkim 123238405Sjkim/* 124238405Sjkim * Level 0 reservations consist of 512 pages under PAE and 1024 pages 125290207Sjkim * otherwise. 126238405Sjkim */ 127238405Sjkim#ifndef VM_LEVEL_0_ORDER 128290207Sjkim#ifdef PAE 129238405Sjkim#define VM_LEVEL_0_ORDER 9 130238405Sjkim#else 131290207Sjkim#define VM_LEVEL_0_ORDER 10 132238405Sjkim#endif 133290207Sjkim#endif 134238405Sjkim 135238405Sjkim/* 136238405Sjkim * Kernel physical load address. 137238405Sjkim */ 138238405Sjkim#ifndef KERNLOAD 139238405Sjkim#if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST) 140238405Sjkim#define KERNLOAD 0 141238405Sjkim#else 142238405Sjkim#define KERNLOAD (1 << PDRSHIFT) 143238405Sjkim#endif 144238405Sjkim#endif /* !defined(KERNLOAD) */ 145238405Sjkim 146238405Sjkim/* 147238405Sjkim * Virtual addresses of things. Derived from the page directory and 148238405Sjkim * page table indexes from pmap.h for precision. 149238405Sjkim * Because of the page that is both a PD and PT, it looks a little 150290207Sjkim * messy at times, but hey, we'll do anything to save a page :-) 151238405Sjkim */ 152238405Sjkim 153238405Sjkim#ifdef XEN 154238405Sjkim#define VM_MAX_KERNEL_ADDRESS HYPERVISOR_VIRT_START 155238405Sjkim#else 156238405Sjkim#define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1) 157238405Sjkim#endif 158238405Sjkim 159238405Sjkim#define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI) 160238405Sjkim 161238405Sjkim#define KERNBASE VADDR(KPTDI, 0) 162238405Sjkim 163238405Sjkim#define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 164238405Sjkim#define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0) 165238405Sjkim 166238405Sjkim#define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0) 167238405Sjkim 168238405Sjkim#define USRSTACK VM_MAXUSER_ADDRESS 169238405Sjkim 170238405Sjkim#define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI) 171238405Sjkim#define VM_MIN_ADDRESS ((vm_offset_t)0) 172238405Sjkim 173238405Sjkim/* virtual sizes (bytes) for various kernel submaps */ 174290207Sjkim#ifndef VM_KMEM_SIZE 175238405Sjkim#define VM_KMEM_SIZE (12 * 1024 * 1024) 176290207Sjkim#endif 177238405Sjkim 178238405Sjkim/* 179290207Sjkim * How many physical pages per KVA page allocated. 180290207Sjkim * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), 181238405Sjkim * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX) 182290207Sjkim * is the total KVA space allocated for kmem_map. 183290207Sjkim */ 184238405Sjkim#ifndef VM_KMEM_SIZE_SCALE 185238405Sjkim#define VM_KMEM_SIZE_SCALE (3) 186290207Sjkim#endif 187290207Sjkim 188238405Sjkim/* 189290207Sjkim * Ceiling on the amount of kmem_map KVA space: 40% of the entire KVA space 190290207Sjkim * rounded to the nearest multiple of the superpage size. 191238405Sjkim */ 192238405Sjkim#ifndef VM_KMEM_SIZE_MAX 193290207Sjkim#define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \ 194290207Sjkim VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT) 195238405Sjkim#endif 196290207Sjkim 197290207Sjkim/* initial pagein size of beginning of executable file */ 198238405Sjkim#ifndef VM_INITIAL_PAGEIN 199290207Sjkim#define VM_INITIAL_PAGEIN 16 200238405Sjkim#endif 201290207Sjkim 202290207Sjkim#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */ 203238405Sjkim 204238405Sjkim#endif /* _MACHINE_VMPARAM_H_ */ 205290207Sjkim