reactos/ntoskrnl/mm/i386/page.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id: page.c,v 1.60 2003/10/12 17:05:48 hbirr Exp $
  20  *
  21  * PROJECT:     ReactOS kernel
  22  * FILE:        ntoskrnl/mm/i386/page.c
  23  * PURPOSE:     low level memory managment manipulation
  24  * PROGRAMER:   David Welch (welch@cwcom.net)
  25  * UPDATE HISTORY:
  26  *              9/3/98: Created
  27  */
  28
  29 /* INCLUDES ***************************************************************/
  30
  31 #include <ddk/ntddk.h>
  32 #include <internal/mm.h>
  33 #include <internal/i386/mm.h>
  34 #include <internal/ex.h>
  35 #include <internal/ps.h>
  36
  37 #define NDEBUG
  38 #include <internal/debug.h>
  39
  40 /* GLOBALS *****************************************************************/
  41
  42 #define PA_BIT_PRESENT   (0)
  43 #define PA_BIT_READWRITE (1)
  44 #define PA_BIT_USER      (2)
  45 #define PA_BIT_WT        (3)
  46 #define PA_BIT_CD        (4)
  47 #define PA_BIT_ACCESSED  (5)
  48 #define PA_BIT_DIRTY     (6)
  49
  50 #define PA_PRESENT   (1 << PA_BIT_PRESENT)
  51 #define PA_READWRITE (1 << PA_BIT_READWRITE)
  52 #define PA_USER      (1 << PA_BIT_USER)
  53 #define PA_DIRTY     (1 << PA_BIT_DIRTY)
  54 #define PA_WT        (1 << PA_BIT_WT)
  55 #define PA_CD        (1 << PA_BIT_CD)
  56 #define PA_ACCESSED  (1 << PA_BIT_ACCESSED)
  57 #define PA_DIRTY     (1 << PA_BIT_DIRTY)
  58
  59 #define PAGETABLE_MAP     (0xf0000000)
  60 #define PAGEDIRECTORY_MAP (0xf0000000 + (PAGETABLE_MAP / (1024)))
  61
  62 ULONG MmGlobalKernelPageDirectory[1024] = {0, };
  63
  64 #define PTE_TO_PAGE(X) ((LARGE_INTEGER)(LONGLONG)(PAGE_MASK(X)))
  65
  66 /* FUNCTIONS ***************************************************************/
  67
  68 PULONG
  69 MmGetPageDirectory(VOID)
  70 {
  71    unsigned int page_dir=0;
  72    __asm__("movl %%cr3,%0\n\t"
  73                 : "=r" (page_dir));
  74    return((PULONG)page_dir);
  75 }
  76
  77 static ULONG
  78 ProtectToPTE(ULONG flProtect)
  79 {
  80   ULONG Attributes = 0;
  81
  82   if (flProtect & PAGE_NOACCESS || flProtect & PAGE_GUARD)
  83     {
  84       Attributes = 0;
  85     }
  86   else if (flProtect & PAGE_READWRITE || flProtect & PAGE_EXECUTE_READWRITE)
  87     {
  88       Attributes = PA_PRESENT | PA_READWRITE;
  89     }
  90   else if (flProtect & PAGE_READONLY || flProtect & PAGE_EXECUTE ||
  91            flProtect & PAGE_EXECUTE_READ)
  92     {
  93       Attributes = PA_PRESENT;
  94     }
  95   else
  96     {
  97       DPRINT1("Unknown main protection type.\n");
  98       KEBUGCHECK(0);
  99     }
 100   if (!(flProtect & PAGE_SYSTEM))
 101     {
 102       Attributes = Attributes | PA_USER;
 103     }
 104   if (flProtect & PAGE_NOCACHE)
 105     {
 106       Attributes = Attributes | PA_CD;
 107     }
 108   if (flProtect & PAGE_WRITETHROUGH)
 109     {
 110       Attributes = Attributes | PA_WT;
 111     }
 112   return(Attributes);
 113 }
 114
 115 #define ADDR_TO_PAGE_TABLE(v) (((ULONG)(v)) / (4 * 1024 * 1024))
 116
 117 #define ADDR_TO_PDE(v) (PULONG)(PAGEDIRECTORY_MAP + \
 118                                 ((((ULONG)(v)) / (1024 * 1024))&(~0x3)))
 119 #define ADDR_TO_PTE(v) (PULONG)(PAGETABLE_MAP + ((((ULONG)v / 1024))&(~0x3)))
 120
 121 #define ADDR_TO_PDE_OFFSET(v) ((((ULONG)(v)) / (4 * 1024 * 1024)))
 122
 123 NTSTATUS Mmi386ReleaseMmInfo(PEPROCESS Process)
 124 {
 125    PUSHORT LdtDescriptor;
 126    ULONG LdtBase;
 127
 128    DPRINT("Mmi386ReleaseMmInfo(Process %x)\n",Process);
 129
 130    LdtDescriptor = (PUSHORT) &Process->Pcb.LdtDescriptor[0];
 131    LdtBase = LdtDescriptor[1] |
 132                    ((LdtDescriptor[2] & 0xff) << 16) |
 133                    ((LdtDescriptor[3] & ~0xff) << 16);
 134
 135    DPRINT("LdtBase: %x\n", LdtBase);
 136
 137    if (LdtBase)
 138      {
 139        ExFreePool((PVOID) LdtBase);
 140      }
 141
 142    MmReleasePageMemoryConsumer(MC_NPPOOL, Process->Pcb.DirectoryTableBase);
 143    Process->Pcb.DirectoryTableBase.QuadPart = 0LL;
 144
 145    DPRINT("Finished Mmi386ReleaseMmInfo()\n");
 146    return(STATUS_SUCCESS);
 147 }
 148
 149 NTSTATUS MmCopyMmInfo(PEPROCESS Src, PEPROCESS Dest)
 150 {
 151    PHYSICAL_ADDRESS PhysPageDirectory;
 152    PULONG PageDirectory;
 153    PKPROCESS KProcess = &Dest->Pcb;
 154
 155    DPRINT("MmCopyMmInfo(Src %x, Dest %x)\n", Src, Dest);
 156
 157    PageDirectory = ExAllocatePage();
 158    if (PageDirectory == NULL)
 159      {
 160         return(STATUS_UNSUCCESSFUL);
 161      }
 162    PhysPageDirectory = MmGetPhysicalAddress(PageDirectory);
 163    KProcess->DirectoryTableBase = PhysPageDirectory;
 164
 165    memset(PageDirectory,0, ADDR_TO_PDE_OFFSET(KERNEL_BASE) * sizeof(ULONG));
 166    memcpy(PageDirectory + ADDR_TO_PDE_OFFSET(KERNEL_BASE),
 167           MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(KERNEL_BASE),
 168           (1024 - ADDR_TO_PDE_OFFSET(KERNEL_BASE)) * sizeof(ULONG));
 169
 170    DPRINT("Addr %x\n",PAGETABLE_MAP / (4*1024*1024));
 171    PageDirectory[PAGETABLE_MAP / (4*1024*1024)] =
 172      PhysPageDirectory.u.LowPart | PA_PRESENT | PA_READWRITE;
 173
 174    ExUnmapPage(PageDirectory);
 175
 176    DPRINT("Finished MmCopyMmInfo()\n");
 177    return(STATUS_SUCCESS);
 178 }
 179
 180 VOID MmDeletePageTable(PEPROCESS Process, PVOID Address)
 181 {
 182    PEPROCESS CurrentProcess = PsGetCurrentProcess();
 183
 184    if (Process != NULL && Process != CurrentProcess)
 185      {
 186         KeAttachProcess(Process);
 187      }
 188    *(ADDR_TO_PDE(Address)) = 0;
 189    if (Address >= (PVOID)KERNEL_BASE)
 190      {
 191          KEBUGCHECK(0);
 192 //       MmGlobalKernelPageDirectory[ADDR_TO_PDE_OFFSET(Address)] = 0;
 193      }
 194    FLUSH_TLB;
 195    if (Process != NULL && Process != CurrentProcess)
 196      {
 197         KeDetachProcess();
 198      }
 199 }
 200
 201 VOID MmFreePageTable(PEPROCESS Process, PVOID Address)
 202 {
 203    PEPROCESS CurrentProcess = PsGetCurrentProcess();
 204    PULONG PageTable;
 205    ULONG i;
 206    ULONG npage;
 207
 208    if (Process != NULL && Process != CurrentProcess)
 209    {
 210       KeAttachProcess(Process);
 211    }
 212
 213    PageTable = (PULONG)PAGE_ROUND_DOWN((PVOID)ADDR_TO_PTE(Address));
 214    for (i = 0; i < 1024; i++)
 215    {
 216       if (PageTable[i] != 0)
 217       {
 218          DbgPrint("Page table entry not clear at %x/%x (is %x)\n",
 219                   ((ULONG)Address / 4*1024*1024), i, PageTable[i]);
 220          KEBUGCHECK(0);
 221       }
 222    }
 223    npage = *(ADDR_TO_PDE(Address));
 224    *(ADDR_TO_PDE(Address)) = 0;
 225    FLUSH_TLB;
 226
 227    if (Address >= (PVOID)KERNEL_BASE)
 228    {
 229 //    MmGlobalKernelPageDirectory[ADDR_TO_PDE_OFFSET(Address)] = 0;
 230       KEBUGCHECK(0);
 231    }
 232    else
 233    {
 234       MmReleasePageMemoryConsumer(MC_NPPOOL, PTE_TO_PAGE(npage));
 235    }
 236    if (Process != NULL && Process != CurrentProcess)
 237    {
 238       KeDetachProcess();
 239    }
 240 }
 241
 242 NTSTATUS MmGetPageEntry2(PVOID PAddress, PULONG* Pte, BOOLEAN MayWait)
 243 /*
 244  * FUNCTION: Get a pointer to the page table entry for a virtual address
 245  */
 246 {
 247    PULONG Pde, kePde;
 248    PHYSICAL_ADDRESS npage;
 249    BOOLEAN Free = FALSE;
 250    NTSTATUS Status;
 251    KIRQL oldIrql;
 252
 253    DPRINT("MmGetPageEntry(Address %x)\n", PAddress);
 254
 255    Pde = ADDR_TO_PDE(PAddress);
 256    if (*Pde == 0)
 257    {
 258       if (PAddress >= (PVOID)KERNEL_BASE)
 259       {
 260          kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(PAddress);
 261          oldIrql = KeRaiseIrqlToSynchLevel();
 262          if (*kePde != 0)
 263          {
 264             *Pde = *kePde;
 265             FLUSH_TLB;
 266          }
 267          else
 268          {
 269             KeLowerIrql(oldIrql);
 270             Status = MmRequestPageMemoryConsumer(MC_NPPOOL, MayWait, &npage);
 271             if (!NT_SUCCESS(Status))
 272             {
 273                KEBUGCHECK(0);
 274             }
 275             oldIrql = KeRaiseIrqlToSynchLevel();
 276             /* An other thread can set this pde entry, we must check again */
 277             if (*kePde == 0)
 278             {
 279                *kePde = npage.u.LowPart | PA_PRESENT | PA_READWRITE;
 280             }
 281             else
 282             {
 283                Free = TRUE;
 284             }
 285             *Pde = *kePde;
 286             FLUSH_TLB;
 287          }
 288          KeLowerIrql(oldIrql);
 289       }
 290       else
 291       {
 292          Status = MmRequestPageMemoryConsumer(MC_NPPOOL, MayWait, &npage);
 293          if (!NT_SUCCESS(Status))
 294          {
 295             return(Status);
 296          }
 297          *Pde = npage.u.LowPart | PA_PRESENT | PA_READWRITE | PA_USER;
 298          FLUSH_TLB;
 299       }
 300    }
 301    *Pte = (PULONG)ADDR_TO_PTE(PAddress);
 302    if (Free)
 303    {
 304       MmReleasePageMemoryConsumer(MC_NPPOOL, npage);
 305    }
 306    return STATUS_SUCCESS;
 307 }
 308
 309 ULONG MmGetPageEntryForProcess(PEPROCESS Process, PVOID Address)
 310 {
 311    ULONG Entry;
 312    PEPROCESS CurrentProcess = PsGetCurrentProcess();
 313
 314    if (Process != NULL && Process != CurrentProcess)
 315      {
 316         KeAttachProcess(Process);
 317      }
 318    Entry = *MmGetPageEntry(Address);
 319    if (Process != NULL && Process != CurrentProcess)
 320      {
 321         KeDetachProcess();
 322      }
 323    return(Entry);
 324 }
 325
 326 ULONG MmGetPageEntry1(PVOID PAddress)
 327 /*
 328  * FUNCTION: Get a pointer to the page table entry for a virtual address
 329  */
 330 {
 331    PULONG Pde, kePde;
 332    ULONG Entry = 0;
 333
 334    DPRINT("MmGetPageEntry(Address %x)\n", PAddress);
 335
 336    Pde = ADDR_TO_PDE(PAddress);
 337    if (*Pde == 0)
 338    {
 339        if (PAddress >= (PVOID)KERNEL_BASE)
 340        {
 341           kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(PAddress);
 342           if (*kePde != 0)
 343           {
 344              *Pde = *kePde;
 345              FLUSH_TLB;
 346              Entry = *(PULONG)ADDR_TO_PTE(PAddress);
 347           }
 348        }
 349    }
 350    else
 351    {
 352       Entry = *(PULONG)ADDR_TO_PTE(PAddress);
 353    }
 354    return Entry;
 355 }
 356
 357 ULONG MmGetPageEntryForProcess1(PEPROCESS Process, PVOID Address)
 358 {
 359    ULONG Entry;
 360    PEPROCESS CurrentProcess = PsGetCurrentProcess();
 361
 362    if (Process != NULL && Process != CurrentProcess)
 363      {
 364         KeAttachProcess(Process);
 365      }
 366    Entry = MmGetPageEntry1(Address);
 367    if (Process != NULL && Process != CurrentProcess)
 368      {
 369         KeDetachProcess();
 370      }
 371    return(Entry);
 372 }
 373
 374
 375 PHYSICAL_ADDRESS
 376 MmGetPhysicalAddressForProcess(PEPROCESS Process,
 377                                PVOID Address)
 378 {
 379    ULONG PageEntry;
 380
 381    PageEntry = MmGetPageEntryForProcess(Process, Address);
 382
 383    if (!(PageEntry & PA_PRESENT))
 384      {
 385         return((LARGE_INTEGER)0LL);
 386      }
 387    return(PTE_TO_PAGE(PageEntry));
 388 }
 389
 390 VOID
 391 MmDisableVirtualMapping(PEPROCESS Process, PVOID Address, BOOL* WasDirty, PHYSICAL_ADDRESS* PhysicalAddr)
 392 /*
 393  * FUNCTION: Delete a virtual mapping
 394  */
 395 {
 396    ULONG Pte;
 397    PULONG Pde;
 398    PEPROCESS CurrentProcess = PsGetCurrentProcess();
 399    BOOLEAN WasValid;
 400
 401    /*
 402     * If we are setting a page in another process we need to be in its
 403     * context.
 404     */
 405    if (Process != NULL && Process != CurrentProcess)
 406      {
 407         KeAttachProcess(Process);
 408      }
 409
 410    /*
 411     * Set the page directory entry, we may have to copy the entry from
 412     * the global page directory.
 413     */
 414    Pde = ADDR_TO_PDE(Address);
 415    if ((*Pde) == 0 &&
 416        MmGlobalKernelPageDirectory[ADDR_TO_PDE_OFFSET(Address)] != 0)
 417      {
 418        (*Pde) = MmGlobalKernelPageDirectory[ADDR_TO_PDE_OFFSET(Address)];
 419        FLUSH_TLB;
 420      }
 421    if ((*Pde) == 0)
 422      {
 423        KEBUGCHECK(0);
 424      }
 425
 426    /*
 427     * Atomically set the entry to zero and get the old value.
 428     */
 429    Pte = *ADDR_TO_PTE(Address);
 430    *ADDR_TO_PTE(Address) = Pte & (~PA_PRESENT);
 431    FLUSH_TLB;
 432    WasValid = (PAGE_MASK(Pte) != 0);
 433    if (!WasValid)
 434      {
 435        KEBUGCHECK(0);
 436      }
 437
 438    /*
 439     * If necessary go back to the original context
 440     */
 441    if (Process != NULL && Process != CurrentProcess)
 442      {
 443         KeDetachProcess();
 444      }
 445
 446    /*
 447     * Return some information to the caller
 448     */
 449    if (WasDirty != NULL)
 450      {
 451        *WasDirty = Pte & PA_DIRTY;
 452      }
 453    if (PhysicalAddr != NULL)
 454      {
 455        PhysicalAddr->u.HighPart = 0;
 456        PhysicalAddr->u.LowPart = PAGE_MASK(Pte);
 457      }
 458 }
 459
 460 VOID
 461 MmRawDeleteVirtualMapping(PVOID Address)
 462 {
 463    PULONG Pde, kePde;
 464
 465    /*
 466     * Set the page directory entry, we may have to copy the entry from
 467     * the global page directory.
 468     */
 469    Pde = ADDR_TO_PDE(Address);
 470    if (*Pde == 0 && Address >= (PVOID)KERNEL_BASE)
 471    {
 472       kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(Address);
 473       if (*kePde != 0)
 474       {
 475          *Pde = *kePde;
 476          FLUSH_TLB;
 477       }
 478    }
 479
 480    if (*Pde == 0)
 481      {
 482         return;
 483      }
 484
 485    /*
 486     * Set the entry to zero
 487     */
 488    *ADDR_TO_PTE(Address) = 0;
 489    FLUSH_TLB;
 490 }
 491
 492 VOID
 493 MmDeleteVirtualMapping(PEPROCESS Process, PVOID Address, BOOL FreePage,
 494                        BOOL* WasDirty, PHYSICAL_ADDRESS* PhysicalAddr)
 495 /*
 496  * FUNCTION: Delete a virtual mapping
 497  */
 498 {
 499    ULONG Pte;
 500    PULONG Pde, kePde;
 501    PEPROCESS CurrentProcess = PsGetCurrentProcess();
 502    BOOLEAN WasValid;
 503
 504    /*
 505     * If we are setting a page in another process we need to be in its
 506     * context.
 507     */
 508    if (Process != NULL && Process != CurrentProcess)
 509      {
 510         KeAttachProcess(Process);
 511      }
 512
 513    /*
 514     * Set the page directory entry, we may have to copy the entry from
 515     * the global page directory.
 516     */
 517    Pde = ADDR_TO_PDE(Address);
 518    if (*Pde == 0 && Address >= (PVOID)KERNEL_BASE)
 519    {
 520       kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(Address);
 521       if (*kePde != 0)
 522       {
 523          *Pde = *kePde;
 524          FLUSH_TLB;
 525       }
 526    }
 527
 528    if (*Pde == 0)
 529      {
 530         if (Process != NULL && Process != CurrentProcess)
 531           {
 532              KeDetachProcess();
 533           }
 534         if (WasDirty != NULL)
 535           {
 536             *WasDirty = FALSE;
 537           }
 538         if (PhysicalAddr != NULL)
 539           {
 540             *PhysicalAddr = (LARGE_INTEGER)0LL;
 541           }
 542         return;
 543      }
 544
 545    /*
 546     * Atomically set the entry to zero and get the old value.
 547     */
 548    Pte = (ULONG)InterlockedExchange((PLONG)ADDR_TO_PTE(Address), 0);
 549    FLUSH_TLB;
 550    WasValid = (PAGE_MASK(Pte) != 0);
 551    if (WasValid)
 552      {
 553        MmMarkPageUnmapped(PTE_TO_PAGE(Pte));
 554      }
 555    if (FreePage && WasValid)
 556      {
 557        MmReleasePageMemoryConsumer(MC_NPPOOL, PTE_TO_PAGE(Pte));
 558      }
 559
 560    /*
 561     * Decrement the reference count for this page table.
 562     */
 563    if (Process != NULL && WasValid &&
 564        Process->AddressSpace.PageTableRefCountTable != NULL &&
 565        Address < (PVOID)KERNEL_BASE)
 566      {
 567         PUSHORT Ptrc;
 568
 569         Ptrc = Process->AddressSpace.PageTableRefCountTable;
 570
 571         Ptrc[ADDR_TO_PAGE_TABLE(Address)]--;
 572         if (Ptrc[ADDR_TO_PAGE_TABLE(Address)] == 0)
 573           {
 574              MmFreePageTable(Process, Address);
 575           }
 576      }
 577
 578    /*
 579     * If necessary go back to the original context
 580     */
 581    if (Process != NULL && Process != CurrentProcess)
 582      {
 583         KeDetachProcess();
 584      }
 585
 586    /*
 587     * Return some information to the caller
 588     */
 589    if (WasDirty != NULL)
 590      {
 591        if (Pte & PA_DIRTY)
 592          {
 593            *WasDirty = TRUE;
 594          }
 595        else
 596          {
 597            *WasDirty = FALSE;
 598          }
 599      }
 600    if (PhysicalAddr != NULL)
 601      {
 602        *PhysicalAddr = PTE_TO_PAGE(Pte);
 603      }
 604 }
 605
 606 VOID
 607 MmDeletePageFileMapping(PEPROCESS Process, PVOID Address,
 608                         SWAPENTRY* SwapEntry)
 609 /*
 610  * FUNCTION: Delete a virtual mapping
 611  */
 612 {
 613    ULONG Pte;
 614    PULONG Pde, kePde;
 615    PEPROCESS CurrentProcess = PsGetCurrentProcess();
 616    BOOLEAN WasValid = FALSE;
 617
 618    /*
 619     * If we are setting a page in another process we need to be in its
 620     * context.
 621     */
 622    if (Process != NULL && Process != CurrentProcess)
 623      {
 624         KeAttachProcess(Process);
 625      }
 626
 627    /*
 628     * Set the page directory entry, we may have to copy the entry from
 629     * the global page directory.
 630     */
 631    Pde = ADDR_TO_PDE(Address);
 632    if (*Pde == 0)
 633    {
 634       if (Address >= (PVOID)KERNEL_BASE)
 635       {
 636          kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(Address);
 637          if (*kePde != 0)
 638          {
 639             *Pde = *kePde;
 640             FLUSH_TLB;
 641          }
 642       }
 643    }
 644    if (*Pde == 0)
 645      {
 646         if (Process != NULL && Process != CurrentProcess)
 647           {
 648              KeDetachProcess();
 649           }
 650         *SwapEntry = 0;
 651         return;
 652      }
 653
 654    /*
 655     * Atomically set the entry to zero and get the old value.
 656     */
 657    Pte = (ULONG)InterlockedExchange((PLONG)ADDR_TO_PTE(Address), 0);
 658    FLUSH_TLB;
 659
 660    WasValid = PAGE_MASK(Pte) == 0 ? FALSE : TRUE;
 661
 662    /*
 663     * Decrement the reference count for this page table.
 664     */
 665    if (Process != NULL && WasValid &&
 666        Process->AddressSpace.PageTableRefCountTable != NULL &&
 667        Address < (PVOID)KERNEL_BASE)
 668      {
 669         PUSHORT Ptrc;
 670
 671         Ptrc = Process->AddressSpace.PageTableRefCountTable;
 672
 673         Ptrc[ADDR_TO_PAGE_TABLE(Address)]--;
 674         if (Ptrc[ADDR_TO_PAGE_TABLE(Address)] == 0)
 675           {
 676              MmFreePageTable(Process, Address);
 677           }
 678      }
 679
 680    /*
 681     * If necessary go back to the original context
 682     */
 683    if (Process != NULL && Process != CurrentProcess)
 684      {
 685         KeDetachProcess();
 686      }
 687
 688    /*
 689     * Return some information to the caller
 690     */
 691    *SwapEntry = Pte >> 1;
 692 }
 693
 694 BOOLEAN
 695 Mmi386MakeKernelPageTableGlobal(PVOID PAddress)
 696 {
 697    PULONG kePde, Pde;
 698
 699    Pde = ADDR_TO_PDE(PAddress);
 700    if (*Pde == 0)
 701    {
 702       kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(PAddress);
 703       if (*kePde != 0)
 704       {
 705          *Pde = *kePde;
 706          FLUSH_TLB;
 707          return(TRUE);
 708       }
 709    }
 710    return(FALSE);
 711 }
 712
 713 BOOLEAN MmIsPageTablePresent(PVOID PAddress)
 714 {
 715    PULONG Pde, kePde;
 716
 717    Pde = ADDR_TO_PDE(PAddress);
 718    if (*Pde == 0)
 719    {
 720       kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(PAddress);
 721       if (*kePde != 0)
 722       {
 723          *Pde = *kePde;
 724          FLUSH_TLB;
 725          return TRUE;
 726       }
 727    }
 728    return FALSE;
 729 }
 730
 731 NTSTATUS MmCreatePageTable(PVOID PAddress)
 732 {
 733    PULONG Pde, kePde;
 734    PHYSICAL_ADDRESS npage;
 735    NTSTATUS Status;
 736
 737    DPRINT("MmGetPageEntry(Address %x)\n", PAddress);
 738
 739    Pde = ADDR_TO_PDE(PAddress);
 740    DPRINT("page_dir %x *page_dir %x\n", Pde, *Pde);
 741    if (*Pde == 0 && PAddress >= (PVOID)KERNEL_BASE)
 742    {
 743       kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(PAddress);
 744       if (*kePde != 0)
 745       {
 746          *Pde = *kePde;
 747          FLUSH_TLB;
 748          return STATUS_SUCCESS;
 749       }
 750       /* Should we create a kernel page table? */
 751       DPRINT1("!!!!!!!!!!!!!!!!!!\n");
 752       return STATUS_UNSUCCESSFUL;
 753    }
 754
 755    if (*Pde == 0)
 756    {
 757       Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &npage);
 758       if (!NT_SUCCESS(Status))
 759       {
 760          return(Status);
 761       }
 762       MiZeroPage(npage);
 763       *Pde = npage.u.LowPart | PA_PRESENT | PA_READWRITE | PA_USER;
 764       FLUSH_TLB;
 765    }
 766    return(STATUS_SUCCESS);
 767 }
 768
 769 PULONG MmGetPageEntry(PVOID PAddress)
 770 /*
 771  * FUNCTION: Get a pointer to the page table entry for a virtual address
 772  */
 773 {
 774    PULONG Pde, kePde;
 775    PHYSICAL_ADDRESS npage;
 776    KIRQL oldIrql;
 777    BOOLEAN Free = FALSE;
 778    NTSTATUS Status;
 779
 780    DPRINT("MmGetPageEntry(Address %x)\n", PAddress);
 781
 782    Pde = ADDR_TO_PDE(PAddress);
 783    DPRINT("page_dir %x *page_dir %x\n",Pde,*Pde);
 784    if (*Pde == 0)
 785    {
 786       if (PAddress >= (PVOID)KERNEL_BASE)
 787       {
 788          oldIrql = KeRaiseIrqlToSynchLevel();
 789          kePde = MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(PAddress);
 790          if (*kePde != 0)
 791          {
 792             *Pde = *kePde;
 793             FLUSH_TLB;
 794          }
 795          else
 796          {
 797             KeLowerIrql(oldIrql);
 798             Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &npage);
 799             if (!NT_SUCCESS(Status))
 800             {
 801                KEBUGCHECK(0);
 802             }
 803             MiZeroPage(npage);
 804             oldIrql = KeRaiseIrqlToSynchLevel();
 805             if (*kePde != 0)
 806             {
 807                *Pde = *kePde;
 808                FLUSH_TLB;
 809                Free = TRUE;
 810             }
 811             else
 812             {
 813                *Pde = *kePde = npage.u.LowPart | PA_PRESENT | PA_READWRITE;
 814                FLUSH_TLB;
 815             }
 816          }
 817          KeLowerIrql(oldIrql);
 818       }
 819       else
 820       {
 821          Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &npage);
 822          if (!NT_SUCCESS(Status))
 823          {
 824             KEBUGCHECK(0);
 825          }
 826          MiZeroPage(npage);
 827          *Pde = npage.u.LowPart | PA_PRESENT | PA_READWRITE | PA_USER;
 828          FLUSH_TLB;
 829       }
 830       if (Free)
 831       {
 832          MmReleasePageMemoryConsumer(MC_NPPOOL, npage);
 833       }
 834    }
 835
 836    return ADDR_TO_PTE(PAddress);
 837 }
 838
 839 BOOLEAN MmIsDirtyPage(PEPROCESS Process, PVOID Address)
 840 {
 841    return((MmGetPageEntryForProcess(Process, Address)) & PA_DIRTY);
 842 }
 843
 844 BOOLEAN
 845 MmIsAccessedAndResetAccessPage(PEPROCESS Process, PVOID Address)
 846 {
 847    PULONG PageEntry;
 848    PEPROCESS CurrentProcess;
 849    BOOLEAN Accessed;
 850
 851    if (Process)
 852      {
 853        CurrentProcess = PsGetCurrentProcess();
 854        if (Process != CurrentProcess)
 855          {
 856            KeAttachProcess(Process);
 857          }
 858      }
 859    else
 860      {
 861        if (((ULONG)Address & ~0xFFF) < KERNEL_BASE)
 862          {
 863            DPRINT1("MmIsAccessedAndResetAccessPage is called for user space without a process.\n");
 864            KEBUGCHECK(0);
 865          }
 866        CurrentProcess = NULL;
 867      }
 868
 869    PageEntry = MmGetPageEntry(Address);
 870    Accessed = (*PageEntry) & PA_ACCESSED;
 871    if (Accessed)
 872      {
 873        (*PageEntry) = (*PageEntry) & (~PA_ACCESSED);
 874        FLUSH_TLB;
 875      }
 876    if (Process != CurrentProcess)
 877      {
 878         KeDetachProcess();
 879      }
 880
 881    return(Accessed);
 882 }
 883
 884 VOID MmSetCleanPage(PEPROCESS Process, PVOID Address)
 885 {
 886    PULONG PageEntry;
 887    PEPROCESS CurrentProcess;
 888
 889    if (Process)
 890      {
 891        CurrentProcess = PsGetCurrentProcess();
 892        if (Process != CurrentProcess)
 893          {
 894            KeAttachProcess(Process);
 895          }
 896      }
 897    else
 898      {
 899        if (((ULONG)Address & ~0xFFF) < KERNEL_BASE)
 900          {
 901            DPRINT1("MmSetCleanPage is called for user space without a process.\n");
 902            KEBUGCHECK(0);
 903          }
 904        CurrentProcess = NULL;
 905      }
 906    PageEntry = MmGetPageEntry(Address);
 907    (*PageEntry) = (*PageEntry) & (~PA_DIRTY);
 908    FLUSH_TLB;
 909    if (Process != CurrentProcess)
 910      {
 911         KeDetachProcess();
 912      }
 913 }
 914
 915 VOID MmSetDirtyPage(PEPROCESS Process, PVOID Address)
 916 {
 917    PULONG PageEntry;
 918    PEPROCESS CurrentProcess = NULL;
 919
 920    if (Process)
 921      {
 922        CurrentProcess = PsGetCurrentProcess();
 923        if (Process != CurrentProcess)
 924          {
 925            KeAttachProcess(Process);
 926          }
 927      }
 928    else
 929      {
 930        if (((ULONG)Address & ~0xFFF) < KERNEL_BASE)
 931          {
 932            DPRINT1("MmSetDirtyPage is called for user space without a process.\n");
 933            KEBUGCHECK(0);
 934          }
 935        CurrentProcess = NULL;
 936      }
 937    PageEntry = MmGetPageEntry(Address);
 938    (*PageEntry) = (*PageEntry) | PA_DIRTY;
 939    FLUSH_TLB;
 940    if (Process != CurrentProcess)
 941      {
 942         KeDetachProcess();
 943      }
 944 }
 945
 946 VOID MmEnableVirtualMapping(PEPROCESS Process, PVOID Address)
 947 {
 948    PULONG PageEntry;
 949    PEPROCESS CurrentProcess = PsGetCurrentProcess();
 950
 951    if (Process != CurrentProcess)
 952      {
 953         KeAttachProcess(Process);
 954      }
 955    PageEntry = MmGetPageEntry(Address);
 956    (*PageEntry) = (*PageEntry) | PA_PRESENT;
 957    FLUSH_TLB;
 958    if (Process != CurrentProcess)
 959      {
 960         KeDetachProcess();
 961      }
 962 }
 963
 964 BOOLEAN MmIsPagePresent(PEPROCESS Process, PVOID Address)
 965 {
 966    return((MmGetPageEntryForProcess1(Process, Address)) & PA_PRESENT);
 967 }
 968
 969 BOOLEAN MmIsPageSwapEntry(PEPROCESS Process, PVOID Address)
 970 {
 971   ULONG Pte;
 972   Pte = MmGetPageEntryForProcess1(Process, Address);
 973   return((!(Pte & PA_PRESENT)) && Pte != 0);
 974 }
 975
 976 NTSTATUS
 977 MmCreateVirtualMappingDump(PVOID Address,
 978                            ULONG flProtect,
 979                            PHYSICAL_ADDRESS PhysicalAddress)
 980 {
 981    ULONG Attributes;
 982    PULONG Pte;
 983    NTSTATUS Status;
 984
 985    if (Address < (PVOID)KERNEL_BASE)
 986      {
 987        DPRINT1("No process\n");
 988        KEBUGCHECK(0);
 989      }
 990
 991    Attributes = ProtectToPTE(flProtect);
 992    if (!(Attributes & PA_PRESENT) && PhysicalAddress.QuadPart != 0)
 993      {
 994        DPRINT1("Setting physical address but not allowing access at address "
 995                "0x%.8X with attributes %x/%x.\n",
 996                Address, Attributes, flProtect);
 997        KEBUGCHECK(0);
 998      }
 999
1000    Status = MmGetPageEntry2(Address, &Pte, FALSE);
1001    if (!NT_SUCCESS(Status))
1002      {
1003         return(Status);
1004      }
1005    if (PAGE_MASK((*Pte)) != 0 && !((*Pte) & PA_PRESENT))
1006      {
1007        KEBUGCHECK(0);
1008      }
1009    *Pte = PhysicalAddress.QuadPart | Attributes;
1010    FLUSH_TLB;
1011    return(STATUS_SUCCESS);
1012 }
1013
1014
1015 NTSTATUS
1016 MmCreateVirtualMappingForKernel(PVOID Address,
1017                                 ULONG flProtect,
1018                                 PHYSICAL_ADDRESS PhysicalAddress)
1019 {
1020   PEPROCESS CurrentProcess;
1021   ULONG Attributes;
1022   PULONG Pte;
1023   NTSTATUS Status;
1024   PEPROCESS Process = NULL;
1025
1026   if (Process != NULL)
1027     {
1028       CurrentProcess = PsGetCurrentProcess();
1029     }
1030   else
1031     {
1032       CurrentProcess = NULL;
1033     }
1034
1035    if (Process == NULL && Address < (PVOID)KERNEL_BASE)
1036      {
1037        DPRINT1("No process\n");
1038        KEBUGCHECK(0);
1039      }
1040    if (Process != NULL && Address >= (PVOID)KERNEL_BASE)
1041      {
1042        DPRINT1("Setting kernel address with process context\n");
1043        KEBUGCHECK(0);
1044      }
1045    Attributes = ProtectToPTE(flProtect);
1046
1047    if (Process != NULL && Process != CurrentProcess)
1048      {
1049         KeAttachProcess(Process);
1050      }
1051
1052    Status = MmGetPageEntry2(Address, &Pte, FALSE);
1053    if (!NT_SUCCESS(Status))
1054      {
1055         if (Process != NULL && Process != CurrentProcess)
1056           {
1057              KeDetachProcess();
1058           }
1059         return(Status);
1060      }
1061    if (PAGE_MASK((*Pte)) != 0 && !((*Pte) & PA_PRESENT))
1062      {
1063        KEBUGCHECK(0);
1064      }
1065    if (PAGE_MASK((*Pte)) != 0)
1066      {
1067        MmMarkPageUnmapped(PTE_TO_PAGE((*Pte)));
1068      }
1069    *Pte = PhysicalAddress.QuadPart | Attributes;
1070    if (Process != NULL &&
1071        Process->AddressSpace.PageTableRefCountTable != NULL &&
1072        Address < (PVOID)KERNEL_BASE &&
1073        Attributes & PA_PRESENT)
1074      {
1075         PUSHORT Ptrc;
1076
1077         Ptrc = Process->AddressSpace.PageTableRefCountTable;
1078
1079         Ptrc[ADDR_TO_PAGE_TABLE(Address)]++;
1080      }
1081    FLUSH_TLB;
1082    if (Process != NULL && Process != CurrentProcess)
1083      {
1084         KeDetachProcess();
1085      }
1086    return(STATUS_SUCCESS);
1087 }
1088
1089 NTSTATUS
1090 MmCreatePageFileMapping(PEPROCESS Process,
1091                         PVOID Address,
1092                         SWAPENTRY SwapEntry)
1093 {
1094   PEPROCESS CurrentProcess;
1095   PULONG Pte;
1096   NTSTATUS Status;
1097
1098   if (Process != NULL)
1099     {
1100       CurrentProcess = PsGetCurrentProcess();
1101     }
1102   else
1103     {
1104       CurrentProcess = NULL;
1105     }
1106
1107   if (Process == NULL && Address < (PVOID)KERNEL_BASE)
1108     {
1109       DPRINT1("No process\n");
1110       KEBUGCHECK(0);
1111      }
1112   if (Process != NULL && Address >= (PVOID)KERNEL_BASE)
1113     {
1114       DPRINT1("Setting kernel address with process context\n");
1115       KEBUGCHECK(0);
1116     }
1117   if (SwapEntry & (1 << 31))
1118     {
1119       KEBUGCHECK(0);
1120     }
1121
1122   if (Process != NULL && Process != CurrentProcess)
1123     {
1124         KeAttachProcess(Process);
1125     }
1126
1127   Status = MmGetPageEntry2(Address, &Pte, FALSE);
1128   if (!NT_SUCCESS(Status))
1129     {
1130         if (Process != NULL && Process != CurrentProcess)
1131           {
1132             KeDetachProcess();
1133           }
1134         return(Status);
1135     }
1136   if (PAGE_MASK((*Pte)) != 0)
1137     {
1138       MmMarkPageUnmapped(PTE_TO_PAGE((*Pte)));
1139     }
1140   *Pte = SwapEntry << 1;
1141   if (Process != NULL &&
1142       Process->AddressSpace.PageTableRefCountTable != NULL &&
1143       Address < (PVOID)KERNEL_BASE)
1144     {
1145       PUSHORT Ptrc;
1146
1147       Ptrc = Process->AddressSpace.PageTableRefCountTable;
1148
1149       Ptrc[ADDR_TO_PAGE_TABLE(Address)]++;
1150     }
1151   FLUSH_TLB;
1152   if (Process != NULL && Process != CurrentProcess)
1153     {
1154       KeDetachProcess();
1155     }
1156   return(STATUS_SUCCESS);
1157 }
1158
1159
1160
1161 NTSTATUS
1162 MmCreateVirtualMappingUnsafe(PEPROCESS Process,
1163                              PVOID Address,
1164                              ULONG flProtect,
1165                              PHYSICAL_ADDRESS PhysicalAddress,
1166                              BOOLEAN MayWait)
1167 {
1168    PEPROCESS CurrentProcess;
1169    ULONG Attributes;
1170    PULONG Pte;
1171    NTSTATUS Status;
1172
1173   if (Process != NULL)
1174     {
1175       CurrentProcess = PsGetCurrentProcess();
1176     }
1177   else
1178     {
1179       CurrentProcess = NULL;
1180     }
1181
1182    if (Process == NULL && Address < (PVOID)KERNEL_BASE)
1183      {
1184        DPRINT1("No process\n");
1185        KEBUGCHECK(0);
1186      }
1187    if (Process != NULL && Address >= (PVOID)KERNEL_BASE)
1188      {
1189        DPRINT1("Setting kernel address with process context\n");
1190        KEBUGCHECK(0);
1191      }
1192    MmMarkPageMapped(PhysicalAddress);
1193
1194    Attributes = ProtectToPTE(flProtect);
1195    if (!(Attributes & PA_PRESENT) && PhysicalAddress.QuadPart != 0)
1196      {
1197        DPRINT1("Setting physical address but not allowing access at address "
1198                "0x%.8X with attributes %x/%x.\n",
1199                Address, Attributes, flProtect);
1200        KEBUGCHECK(0);
1201      }
1202
1203    if (Process != NULL && Process != CurrentProcess)
1204      {
1205         KeAttachProcess(Process);
1206      }
1207
1208    Status = MmGetPageEntry2(Address, &Pte, MayWait);
1209    if (!NT_SUCCESS(Status))
1210      {
1211         if (Process != NULL && Process != CurrentProcess)
1212           {
1213              KeDetachProcess();
1214           }
1215         return(Status);
1216      }
1217    if (PAGE_MASK((*Pte)) != 0 && !((*Pte) & PA_PRESENT))
1218      {
1219        KEBUGCHECK(0);
1220      }
1221    if (PAGE_MASK((*Pte)) != 0)
1222      {
1223        MmMarkPageUnmapped(PTE_TO_PAGE((*Pte)));
1224      }
1225    *Pte = PhysicalAddress.QuadPart | Attributes;
1226    if (Process != NULL &&
1227        Process->AddressSpace.PageTableRefCountTable != NULL &&
1228        Address < (PVOID)KERNEL_BASE &&
1229        Attributes & PA_PRESENT)
1230      {
1231         PUSHORT Ptrc;
1232
1233         Ptrc = Process->AddressSpace.PageTableRefCountTable;
1234
1235         Ptrc[ADDR_TO_PAGE_TABLE(Address)]++;
1236      }
1237    FLUSH_TLB;
1238    if (Process != NULL && Process != CurrentProcess)
1239      {
1240         KeDetachProcess();
1241      }
1242    return(STATUS_SUCCESS);
1243 }
1244
1245 NTSTATUS
1246 MmCreateVirtualMapping(PEPROCESS Process,
1247                        PVOID Address,
1248                        ULONG flProtect,
1249                        PHYSICAL_ADDRESS PhysicalAddress,
1250                        BOOLEAN MayWait)
1251 {
1252   if (!MmIsUsablePage(PhysicalAddress))
1253     {
1254       DPRINT1("Page at address %x not usable\n", PhysicalAddress);
1255       KEBUGCHECK(0);
1256     }
1257
1258   return(MmCreateVirtualMappingUnsafe(Process,
1259                                       Address,
1260                                       flProtect,
1261                                       PhysicalAddress,
1262                                       MayWait));
1263 }
1264
1265 ULONG
1266 MmGetPageProtect(PEPROCESS Process, PVOID Address)
1267 {
1268   ULONG Entry;
1269   ULONG Protect;
1270
1271   Entry = MmGetPageEntryForProcess1(Process, Address);
1272
1273   if (!(Entry & PA_PRESENT))
1274     {
1275       Protect = PAGE_NOACCESS;
1276     }
1277   else if (Entry & PA_READWRITE)
1278     {
1279       Protect = PAGE_READWRITE;
1280     }
1281   else
1282     {
1283       Protect = PAGE_EXECUTE_READ;
1284     }
1285   return(Protect);
1286 }
1287
1288 VOID
1289 MmSetPageProtect(PEPROCESS Process, PVOID Address, ULONG flProtect)
1290 {
1291    ULONG Attributes = 0;
1292    PULONG PageEntry;
1293    PEPROCESS CurrentProcess = PsGetCurrentProcess();
1294
1295    DPRINT("MmSetPageProtect(Process %x  Address %x  flProtect %x)\n",
1296      Process, Address, flProtect);
1297
1298    Attributes = ProtectToPTE(flProtect);
1299    if (Process != NULL && Process != CurrentProcess)
1300      {
1301         KeAttachProcess(Process);
1302      }
1303    PageEntry = MmGetPageEntry(Address);
1304    (*PageEntry) = PAGE_MASK(*PageEntry) | Attributes;
1305    FLUSH_TLB;
1306    if (Process != NULL && Process != CurrentProcess)
1307      {
1308         KeDetachProcess();
1309      }
1310 }
1311
1312 /*
1313  * @implemented
1314  */
1315 PHYSICAL_ADDRESS STDCALL
1316 MmGetPhysicalAddress(PVOID vaddr)
1317 /*
1318  * FUNCTION: Returns the physical address corresponding to a virtual address
1319  */
1320 {
1321    PHYSICAL_ADDRESS p;
1322    ULONG Pte;
1323
1324    DPRINT("MmGetPhysicalAddress(vaddr %x)\n", vaddr);
1325
1326    Pte = *MmGetPageEntry(vaddr);
1327    if (Pte & PA_PRESENT)
1328      {
1329        p.QuadPart = PAGE_MASK(Pte);
1330      }
1331    else
1332      {
1333        p.QuadPart = 0;
1334      }
1335
1336    return p;
1337 }
1338
1339
1340 VOID
1341 MmUpdateStackPageDir(PULONG LocalPageDir, PKTHREAD PThread)
1342 {
1343   unsigned EntryBase = ADDR_TO_PDE_OFFSET(PThread->StackLimit);
1344   unsigned EntryTop = ADDR_TO_PDE_OFFSET(PThread->InitialStack - PAGE_SIZE);
1345
1346   if (0 == LocalPageDir[EntryBase])
1347     {
1348       LocalPageDir[EntryBase] = MmGlobalKernelPageDirectory[EntryBase];
1349     }
1350   if (EntryBase != EntryTop && 0 == LocalPageDir[EntryTop])
1351     {
1352       LocalPageDir[EntryTop] = MmGlobalKernelPageDirectory[EntryTop];
1353     }
1354 }
1355
1356 VOID INIT_FUNCTION
1357 MmInitGlobalKernelPageDirectory(VOID)
1358 {
1359   ULONG i;
1360   PULONG CurrentPageDirectory = (PULONG)PAGEDIRECTORY_MAP;
1361
1362   for (i = ADDR_TO_PDE_OFFSET(KERNEL_BASE); i < 1024; i++)
1363     {
1364       if (i != ADDR_TO_PDE_OFFSET(PAGETABLE_MAP) &&
1365           0 == MmGlobalKernelPageDirectory[i] && 0 != CurrentPageDirectory[i])
1366         {
1367           MmGlobalKernelPageDirectory[i] = CurrentPageDirectory[i];
1368         }
1369     }
1370 }
1371
1372 /* EOF */