1 /* $NetBSD: vmparam.h,v 1.86 2019/02/11 14:59:32 cherry 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 _I386_VMPARAM_H_ 38 #define _I386_VMPARAM_H_ 39 40 #include <sys/mutex.h> 41 42 /* 43 * Machine dependent constants for 386. 44 */ 45 46 /* 47 * Page size on the IA-32 is not variable in the traditional sense. 48 * We override the PAGE_* definitions to compile-time constants. 49 */ 50 #define PAGE_SHIFT 12 51 #define PAGE_SIZE (1 << PAGE_SHIFT) 52 #define PAGE_MASK (PAGE_SIZE - 1) 53 54 /* 55 * Virtual address space arrangement. On 386, both user and kernel 56 * share the address space, not unlike the vax. 57 * USRSTACK is the top (end) of the user stack. Immediately above the 58 * user stack is the page table map, and then kernel address space. 59 */ 60 #define USRSTACK VM_MAXUSER_ADDRESS 61 62 /* 63 * Virtual memory related constants, all in bytes 64 */ 65 #define MAXTSIZ (256*1024*1024) /* max text size */ 66 #ifndef DFLDSIZ 67 #define DFLDSIZ (256*1024*1024) /* initial data size limit */ 68 #endif 69 #ifndef MAXDSIZ 70 #define MAXDSIZ (3U*1024*1024*1024) /* 3G max data size */ 71 #endif 72 #ifndef MAXDSIZ_BU 73 #define MAXDSIZ_BU (2U*1024*1024*1024 + /* 2.5G max data size for */ \ 74 1U* 512*1024*1024) /* bottom-up allocation */ \ 75 /* could be a bit more */ 76 #endif 77 #ifndef DFLSSIZ 78 #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ 79 #endif 80 #ifndef MAXSSIZ 81 #define MAXSSIZ (64*1024*1024) /* max stack size */ 82 #endif 83 84 /* 85 * IA-32 can't do per-page execute permission, so instead we implement 86 * two executable segments for %cs, one that covers everything and one 87 * that excludes some of the address space (currently just the stack). 88 * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment. 89 */ 90 #define I386_MAX_EXE_ADDR (USRSTACK - MAXSSIZ) 91 92 /* 93 * Size of User Raw I/O map 94 */ 95 #define USRIOSIZE 300 96 97 /* 98 * Mach derived constants 99 */ 100 101 /* user/kernel map constants */ 102 #define VM_MIN_ADDRESS ((vaddr_t)0) 103 #define VM_MAXUSER_ADDRESS ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT) - PAGE_SIZE) 104 #define VM_MAX_ADDRESS \ 105 ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT))) 106 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT)) 107 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT)) 108 109 /* 110 * The address to which unspecified mapping requests default 111 */ 112 #ifdef _KERNEL_OPT 113 #include "opt_uvm.h" 114 #include "opt_xen.h" 115 #endif 116 #define __USE_TOPDOWN_VM 117 #define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \ 118 round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU)) 119 120 /* virtual sizes (bytes) for various kernel submaps */ 121 #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 122 123 #define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST 124 125 #ifdef XENPV 126 #define VM_PHYSSEG_MAX 1 127 #define VM_NFREELIST 1 128 #else 129 #define VM_PHYSSEG_MAX 32 /* 1 "hole" + 31 free lists */ 130 #define VM_NFREELIST 4 131 #define VM_FREELIST_FIRST16 3 132 #define VM_FREELIST_FIRST1G 2 133 #define VM_FREELIST_FIRST4G 1 134 #endif /* XENPV */ 135 #define VM_FREELIST_DEFAULT 0 136 137 #endif /* _I386_VMPARAM_H_ */ 138