1 /* $NetBSD: vmparam.h,v 1.88 2022/08/21 13:15:15 riastradh 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 #include <machine/pte.h> 43 44 /* 45 * Machine dependent constants for 386. 46 */ 47 48 /* 49 * Page size on the IA-32 is not variable in the traditional sense. 50 * We override the PAGE_* definitions to compile-time constants. 51 */ 52 #define PAGE_SHIFT 12 53 #define PAGE_SIZE (1 << PAGE_SHIFT) 54 #define PAGE_MASK (PAGE_SIZE - 1) 55 56 /* 57 * Virtual address space arrangement. On 386, both user and kernel 58 * share the address space, not unlike the vax. 59 * USRSTACK is the top (end) of the user stack. Immediately above the 60 * user stack is the page table map, and then kernel address space. 61 */ 62 #define USRSTACK VM_MAXUSER_ADDRESS 63 64 /* 65 * Virtual memory related constants, all in bytes 66 */ 67 #define MAXTSIZ (256*1024*1024) /* max text size */ 68 #ifndef DFLDSIZ 69 #define DFLDSIZ (256*1024*1024) /* initial data size limit */ 70 #endif 71 #ifndef MAXDSIZ 72 #define MAXDSIZ (3U*1024*1024*1024) /* 3G max data size */ 73 #endif 74 #ifndef MAXDSIZ_BU 75 #define MAXDSIZ_BU (2U*1024*1024*1024 + /* 2.5G max data size for */ \ 76 1U* 512*1024*1024) /* bottom-up allocation */ \ 77 /* could be a bit more */ 78 #endif 79 #ifndef DFLSSIZ 80 #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ 81 #endif 82 #ifndef MAXSSIZ 83 #define MAXSSIZ (64*1024*1024) /* max stack size */ 84 #endif 85 86 /* 87 * IA-32 can't do per-page execute permission, so instead we implement 88 * two executable segments for %cs, one that covers everything and one 89 * that excludes some of the address space (currently just the stack). 90 * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment. 91 */ 92 #define I386_MAX_EXE_ADDR (USRSTACK - MAXSSIZ) 93 94 /* 95 * Size of User Raw I/O map 96 */ 97 #define USRIOSIZE 300 98 99 /* 100 * See pmap_private.h for details. 101 */ 102 #ifdef PAE 103 #define L2_SLOT_PTE (KERNBASE/NBPD_L2-4) /* 1532: for recursive PDP map */ 104 #define L2_SLOT_KERN (KERNBASE/NBPD_L2) /* 1536: start of kernel space */ 105 #else /* PAE */ 106 #define L2_SLOT_PTE (KERNBASE/NBPD_L2-1) /* 767: for recursive PDP map */ 107 #define L2_SLOT_KERN (KERNBASE/NBPD_L2) /* 768: start of kernel space */ 108 #endif /* PAE */ 109 110 #define L2_SLOT_KERNBASE L2_SLOT_KERN 111 112 #define PDIR_SLOT_KERN L2_SLOT_KERN 113 #define PDIR_SLOT_PTE L2_SLOT_PTE 114 115 /* size of a PDP: usually one page, except for PAE */ 116 #ifdef PAE 117 #define PDP_SIZE 4 118 #else 119 #define PDP_SIZE 1 120 #endif 121 122 /* largest value (-1 for APTP space) */ 123 #define NKL2_MAX_ENTRIES (NTOPLEVEL_PDES - (KERNBASE/NBPD_L2) - 1) 124 #define NKL1_MAX_ENTRIES (unsigned long)(NKL2_MAX_ENTRIES * NPDPG) 125 126 #define NKL2_KIMG_ENTRIES 0 /* XXX unused */ 127 128 #define NKL2_START_ENTRIES 0 /* XXX computed on runtime */ 129 #define NKL1_START_ENTRIES 0 /* XXX unused */ 130 131 #ifndef XENPV 132 #define NTOPLEVEL_PDES (PAGE_SIZE * PDP_SIZE / (sizeof (pd_entry_t))) 133 #else /* !XENPV */ 134 #ifdef PAE 135 #define NTOPLEVEL_PDES 1964 /* 1964-2047 reserved by Xen */ 136 #else /* PAE */ 137 #define NTOPLEVEL_PDES 1008 /* 1008-1023 reserved by Xen */ 138 #endif /* PAE */ 139 #endif /* !XENPV */ 140 141 /* 142 * Mach derived constants 143 */ 144 145 /* user/kernel map constants */ 146 #define VM_MIN_ADDRESS ((vaddr_t)0) 147 #define VM_MAXUSER_ADDRESS ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT) - PAGE_SIZE) 148 #define VM_MAX_ADDRESS \ 149 ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT))) 150 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT)) 151 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT)) 152 153 /* 154 * The address to which unspecified mapping requests default 155 */ 156 #ifdef _KERNEL_OPT 157 #include "opt_uvm.h" 158 #include "opt_xen.h" 159 #endif 160 #define __USE_TOPDOWN_VM 161 #define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \ 162 round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU)) 163 164 /* virtual sizes (bytes) for various kernel submaps */ 165 #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 166 167 #define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST 168 169 #ifdef XENPV 170 #define VM_PHYSSEG_MAX 1 171 #define VM_NFREELIST 1 172 #else 173 #define VM_PHYSSEG_MAX 32 /* 1 "hole" + 31 free lists */ 174 #define VM_NFREELIST 4 175 #define VM_FREELIST_FIRST16 3 176 #define VM_FREELIST_FIRST1G 2 177 #define VM_FREELIST_FIRST4G 1 178 #endif /* XENPV */ 179 #define VM_FREELIST_DEFAULT 0 180 181 #endif /* _I386_VMPARAM_H_ */ 182
Indexes created Tue Sep 23 14:10:03 GMT 2025