1 /* 2 * Copyright (c) 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * the Systems Programming Group of the University of Utah Computer 7 * Science Department and William Jolitz of UUNET Technologies Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * Derived from hp300 version by Mike Hibler, this version by William 38 * Jolitz uses a recursive map [a pde points to the page directory] to 39 * map the page tables using the pagetables themselves. This is done to 40 * reduce the impact on kernel virtual memory for lots of sparse address 41 * space, and to reduce the cost of memory to each process. 42 * 43 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90 44 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91 45 * $Id: pmap.h,v 1.11 1994/03/07 11:38:48 davidg Exp $ 46 */ 47 48 #ifndef _PMAP_MACHINE_ 49 #define _PMAP_MACHINE_ 1 50 51 #include "vm/vm_prot.h" 52 /* 53 * 386 page table entry and page table directory 54 * W.Jolitz, 8/89 55 */ 56 struct pde 57 { 58 unsigned int 59 pd_v:1, /* valid bit */ 60 pd_prot:2, /* access control */ 61 pd_mbz1:2, /* reserved, must be zero */ 62 pd_u:1, /* hardware maintained 'used' bit */ 63 :1, /* not used */ 64 pd_mbz2:2, /* reserved, must be zero */ 65 :3, /* reserved for software */ 66 pd_pfnum:20; /* physical page frame number of pte's*/ 67 }; 68 69 #define PD_MASK 0xffc00000UL /* page directory address bits */ 70 #define PT_MASK 0x003ff000UL /* page table address bits */ 71 #define PD_SHIFT 22 /* page directory address shift */ 72 #define PG_SHIFT 12 /* page table address shift */ 73 74 struct pte 75 { 76 unsigned int 77 pg_v:1, /* valid bit */ 78 pg_prot:2, /* access control */ 79 pg_mbz1:2, /* reserved, must be zero */ 80 pg_u:1, /* hardware maintained 'used' bit */ 81 pg_m:1, /* hardware maintained modified bit */ 82 pg_mbz2:2, /* reserved, must be zero */ 83 pg_w:1, /* software, wired down page */ 84 :1, /* software (unused) */ 85 pg_nc:1, /* 'uncacheable page' bit */ 86 pg_pfnum:20; /* physical page frame number */ 87 }; 88 89 #define PG_V 0x00000001 90 #define PG_RO 0x00000000 91 #define PG_RW 0x00000002 92 #define PG_u 0x00000004 93 #define PG_PROT 0x00000006 /* all protection bits . */ 94 #define PG_W 0x00000200 95 #define PG_N 0x00000800 /* Non-cacheable */ 96 #define PG_M 0x00000040 97 #define PG_U 0x00000020 98 #define PG_FRAME 0xfffff000UL 99 100 #define PG_NOACC 0 101 #define PG_KR 0x00000000 102 #define PG_KW 0x00000002 103 #define PG_URKR 0x00000004 104 #define PG_URKW 0x00000004 105 #define PG_UW 0x00000006 106 107 /* Garbage for current bastardized pager that assumes a hp300 */ 108 #define PG_NV 0 109 #define PG_CI 0 110 111 /* 112 * Page Protection Exception bits 113 */ 114 #define PGEX_P 0x01 /* Protection violation vs. not present */ 115 #define PGEX_W 0x02 /* during a Write cycle */ 116 #define PGEX_U 0x04 /* access from User mode (UPL) */ 117 118 /* typedef struct pde pd_entry_t; */ /* page directory entry */ 119 /* typedef struct pte pt_entry_t; */ /* Mach page table entry */ 120 typedef unsigned int *pd_entry_t; 121 typedef unsigned int *pt_entry_t; 122 123 /* 124 * NKPDE controls the virtual space of the kernel, what ever is left, minus 125 * the alternate page table area is given to the user (NUPDE) 126 */ 127 /* 128 * NKPDE controls the virtual space of the kernel, what ever is left is 129 * given to the user (NUPDE) 130 */ 131 #ifndef NKPT 132 #define NKPT 15 /* actual number of kernel pte's */ 133 #endif 134 #ifndef NKPDE 135 #define NKPDE 63 /* addressable number of kpte's */ 136 #endif 137 138 #define NUPDE (NPTEPG-NKPDE) /* number of user pde's */ 139 140 /* 141 * The *PTDI values control the layout of virtual memory 142 * 143 * XXX This works for now, but I am not real happy with it, I'll fix it 144 * right after I fix locore.s and the magic 28K hole 145 */ 146 #define APTDPTDI (NPTEPG-1) /* alt ptd entry that points to APTD */ 147 #define KPTDI (APTDPTDI-NKPDE)/* start of kernel virtual pde's */ 148 #define PTDPTDI (KPTDI-1) /* ptd entry that points to ptd! */ 149 #define KSTKPTDI (PTDPTDI-1) /* ptd entry for u./kernel&user stack */ 150 #define KSTKPTEOFF (NBPG/sizeof(pd_entry_t)-UPAGES) /* pte entry for kernel stack */ 151 152 #define PDESIZE sizeof(pd_entry_t) /* for assembly files */ 153 #define PTESIZE sizeof(pt_entry_t) /* for assembly files */ 154 155 /* 156 * Address of current and alternate address space page table maps 157 * and directories. 158 */ 159 #ifdef KERNEL 160 extern pt_entry_t PTmap[], APTmap[], Upte; 161 extern pd_entry_t PTD[], APTD[], PTDpde, APTDpde, Upde; 162 extern pt_entry_t *Sysmap; 163 164 extern int IdlePTD; /* physical address of "Idle" state directory */ 165 #endif 166 167 /* 168 * virtual address to page table entry and 169 * to physical address. Likewise for alternate address space. 170 * Note: these work recursively, thus vtopte of a pte will give 171 * the corresponding pde that in turn maps it. 172 */ 173 #define vtopte(va) (PTmap + i386_btop(va)) 174 #define kvtopte(va) vtopte(va) 175 #define ptetov(pt) (i386_ptob(pt - PTmap)) 176 #define vtophys(va) (((int) (*vtopte(va))&PG_FRAME) | ((int)(va) & PGOFSET)) 177 #define ispt(va) ((va) >= UPT_MIN_ADDRESS && (va) <= KPT_MAX_ADDRESS) 178 179 #define avtopte(va) (APTmap + i386_btop(va)) 180 #define ptetoav(pt) (i386_ptob(pt - APTmap)) 181 #define avtophys(va) (((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PGOFSET)) 182 183 /* 184 * Routine: pmap_kextract 185 * Function: 186 * Extract the physical page address associated 187 * kernel virtual address. 188 */ 189 static inline vm_offset_t 190 pmap_kextract(va) 191 vm_offset_t va; 192 { 193 vm_offset_t pa = *(int *)vtopte(va); 194 pa = (pa & PG_FRAME) | (va & ~PG_FRAME); 195 return pa; 196 } 197 198 /* 199 * macros to generate page directory/table indicies 200 */ 201 202 #define pdei(va) (((va)&PD_MASK)>>PD_SHIFT) 203 #define ptei(va) (((va)&PT_MASK)>>PG_SHIFT) 204 205 /* 206 * Pmap stuff 207 */ 208 209 struct pmap { 210 pd_entry_t *pm_pdir; /* KVA of page directory */ 211 boolean_t pm_pdchanged; /* pdir changed */ 212 short pm_dref; /* page directory ref count */ 213 short pm_count; /* pmap reference count */ 214 simple_lock_data_t pm_lock; /* lock on pmap */ 215 struct pmap_statistics pm_stats; /* pmap statistics */ 216 long pm_ptpages; /* more stats: PT pages */ 217 }; 218 219 typedef struct pmap *pmap_t; 220 221 #ifdef KERNEL 222 extern pmap_t kernel_pmap; 223 #endif 224 225 /* 226 * Macros for speed 227 */ 228 #define PMAP_ACTIVATE(pmapp, pcbp) \ 229 if ((pmapp) != NULL /*&& (pmapp)->pm_pdchanged */) { \ 230 (pcbp)->pcb_cr3 = \ 231 pmap_extract(kernel_pmap, (vm_offset_t)(pmapp)->pm_pdir); \ 232 if ((pmapp) == &curproc->p_vmspace->vm_pmap) \ 233 load_cr3((pcbp)->pcb_cr3); \ 234 (pmapp)->pm_pdchanged = FALSE; \ 235 } 236 237 #define PMAP_DEACTIVATE(pmapp, pcbp) 238 239 /* 240 * For each vm_page_t, there is a list of all currently valid virtual 241 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 242 */ 243 typedef struct pv_entry { 244 struct pv_entry *pv_next; /* next pv_entry */ 245 pmap_t pv_pmap; /* pmap where mapping lies */ 246 vm_offset_t pv_va; /* virtual address for mapping */ 247 } *pv_entry_t; 248 249 #define PV_ENTRY_NULL ((pv_entry_t) 0) 250 251 #define PV_CI 0x01 /* all entries must be cache inhibited */ 252 #define PV_PTPAGE 0x02 /* entry maps a page table page */ 253 254 #ifdef KERNEL 255 256 pv_entry_t pv_table; /* array of entries, one per page */ 257 258 #define pa_index(pa) atop(pa - vm_first_phys) 259 #define pa_to_pvh(pa) (&pv_table[pa_index(pa)]) 260 261 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 262 263 extern pmap_t pmap_create(vm_size_t); 264 extern void pmap_pinit(struct pmap *); 265 extern void pmap_destroy(pmap_t); 266 extern void pmap_release(struct pmap *); 267 extern void pmap_reference(pmap_t); 268 extern void pmap_remove(struct pmap *, vm_offset_t, vm_offset_t); 269 extern void pmap_protect(struct pmap *, vm_offset_t, vm_offset_t, vm_prot_t); 270 extern void pmap_enter(pmap_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t); 271 extern void pmap_change_wiring(pmap_t, vm_offset_t, boolean_t); 272 extern inline pt_entry_t *pmap_pte(pmap_t, vm_offset_t); 273 extern vm_offset_t pmap_extract(pmap_t, vm_offset_t); 274 extern void pmap_copy(pmap_t, pmap_t, vm_offset_t, vm_size_t, vm_offset_t); 275 extern void pmap_collect(pmap_t); 276 struct pcb; extern void pmap_activate(pmap_t, struct pcb *); 277 extern pmap_t pmap_kernel(void); 278 extern void pmap_pageable(pmap_t, vm_offset_t, vm_offset_t, boolean_t); 279 280 281 #endif /* KERNEL */ 282 283 #endif /* _PMAP_MACHINE_ */ 284