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reactos/ntoskrnl/mm/i386/pagepae.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/mm/i386/pagepae.c
* PURPOSE: Low level memory managment manipulation
*
* PROGRAMMERS: David Welch (welch@cwcom.net)
*/
/* INCLUDES ***************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#if defined (ALLOC_PRAGMA)
#pragma alloc_text(INIT, MmInitGlobalKernelPageDirectory)
#endif
/* GLOBALS *****************************************************************/
#define PA_BIT_PRESENT (0)
#define PA_BIT_READWRITE (1)
#define PA_BIT_USER (2)
#define PA_BIT_WT (3)
#define PA_BIT_CD (4)
#define PA_BIT_ACCESSED (5)
#define PA_BIT_DIRTY (6)
#define PA_BIT_GLOBAL (8)
#define PA_PRESENT (1 << PA_BIT_PRESENT)
#define PA_READWRITE (1 << PA_BIT_READWRITE)
#define PA_USER (1 << PA_BIT_USER)
#define PA_DIRTY (1 << PA_BIT_DIRTY)
#define PA_WT (1 << PA_BIT_WT)
#define PA_CD (1 << PA_BIT_CD)
#define PA_ACCESSED (1 << PA_BIT_ACCESSED)
#define PA_GLOBAL (1 << PA_BIT_GLOBAL)
#define PAGEDIRECTORY_MAP (0xc0000000 + (PTE_BASE / (1024)))
#define PAE_PAGEDIRECTORY_MAP (0xc0000000 + (PTE_BASE / (512)))
#define HYPERSPACE (Ke386Pae ? 0xc0800000 : 0xc0400000)
#define IS_HYPERSPACE(v) (((ULONG)(v) >= HYPERSPACE && (ULONG)(v) < HYPERSPACE + 0x400000))
static ULONG MmGlobalKernelPageDirectory[1024];
static ULONGLONG MmGlobalKernelPageDirectoryForPAE[2048];
#define PTE_TO_PFN(X) ((X) >> PAGE_SHIFT)
#define PFN_TO_PTE(X) ((X) << PAGE_SHIFT)
#define PAE_PTE_TO_PFN(X) (PAE_PAGE_MASK(X) >> PAGE_SHIFT)
#define PAE_PFN_TO_PTE(X) ((X) << PAGE_SHIFT)
#define PAGE_MASK(x) ((x)&(~0xfff))
#define PAE_PAGE_MASK(x) ((x)&(~0xfffLL))
extern BOOLEAN Ke386Pae;
extern BOOLEAN Ke386NoExecute;
/* FUNCTIONS ***************************************************************/
BOOLEAN MmUnmapPageTable(PULONG Pt);
ULONG_PTR
NTAPI
MiFlushTlbIpiRoutine(ULONG_PTR Address)
{
if (Address == (ULONGLONG)-1)
{
KeFlushCurrentTb();
}
else if (Address == (ULONGLONG)-2)
{
KeFlushCurrentTb();
}
else
{
__invlpg((PVOID)Address);
}
return 0;
}
VOID
MiFlushTlb(PULONG Pt, PVOID Address)
{
#ifdef CONFIG_SMP
if (Pt)
{
MmUnmapPageTable(Pt);
}
if (KeNumberProcessors > 1)
{
KeIpiGenericCall(MiFlushTlbIpiRoutine, (ULONG_PTR)Address);
}
else
{
MiFlushTlbIpiRoutine((ULONG_PTR)Address);
}
#else
if ((Pt && MmUnmapPageTable(Pt)) || Address >= MmSystemRangeStart)
{
__invlpg(Address);
}
#endif
}
static ULONG
ProtectToPTE(ULONG flProtect)
{
ULONG Attributes = 0;
if (flProtect & (PAGE_NOACCESS|PAGE_GUARD))
{
Attributes = 0;
}
else if (flProtect & PAGE_IS_WRITABLE)
{
Attributes = PA_PRESENT | PA_READWRITE;
}
else if (flProtect & (PAGE_IS_READABLE | PAGE_IS_EXECUTABLE))
{
Attributes = PA_PRESENT;
}
else
{
DPRINT1("Unknown main protection type.\n");
ASSERT(FALSE);
}
if (Ke386NoExecute &&
!(flProtect & PAGE_IS_EXECUTABLE))
{
Attributes = Attributes | 0x80000000;
}
if (flProtect & PAGE_SYSTEM)
{
}
else
{
Attributes = Attributes | PA_USER;
}
if (flProtect & PAGE_NOCACHE)
{
Attributes = Attributes | PA_CD;
}
if (flProtect & PAGE_WRITETHROUGH)
{
Attributes = Attributes | PA_WT;
}
return(Attributes);
}
#define ADDR_TO_PAGE_TABLE(v) (((ULONG)(v)) / (1024 * PAGE_SIZE))
#define ADDR_TO_PDE(v) (PULONG)(PAGEDIRECTORY_MAP + \
((((ULONG)(v)) / (1024 * 1024))&(~0x3)))
#define ADDR_TO_PTE(v) (PULONG)(PTE_BASE + ((((ULONG)(v) / 1024))&(~0x3)))
#define ADDR_TO_PDE_OFFSET(v) ((((ULONG)(v)) / (1024 * PAGE_SIZE)))
#define ADDR_TO_PTE_OFFSET(v) ((((ULONG)(v)) % (1024 * PAGE_SIZE)) / PAGE_SIZE)
#define PAE_ADDR_TO_PAGE_TABLE(v) (((ULONG)(v)) / (512 * PAGE_SIZE))
#define PAE_ADDR_TO_PDE(v) (PULONGLONG) (PAE_PAGEDIRECTORY_MAP + \
((((ULONG_PTR)(v)) / (512 * 512))&(~0x7)))
#define PAE_ADDR_TO_PTE(v) (PULONGLONG) (PTE_BASE + ((((ULONG_PTR)(v) / 512))&(~0x7)))
#define PAE_ADDR_TO_PDTE_OFFSET(v) (((ULONG_PTR)(v)) / (512 * 512 * PAGE_SIZE))
#define PAE_ADDR_TO_PDE_PAGE_OFFSET(v) ((((ULONG_PTR)(v)) % (512 * 512 * PAGE_SIZE)) / (512 * PAGE_SIZE))
#define PAE_ADDR_TO_PDE_OFFSET(v) (((ULONG_PTR)(v))/ (512 * PAGE_SIZE))
#define PAE_ADDR_TO_PTE_OFFSET(v) ((((ULONG_PTR)(v)) % (512 * PAGE_SIZE)) / PAGE_SIZE)
BOOLEAN
NTAPI
MmCreateProcessAddressSpace(IN ULONG MinWs,
IN PEPROCESS Process,
IN PLARGE_INTEGER DirectoryTableBase)
{
NTSTATUS Status;
ULONG i, j;
PFN_NUMBER Pfn[7];
ULONG Count;
DPRINT("MmCopyMmInfo(Src %x, Dest %x)\n", MinWs, Process);
Count = Ke386Pae ? 7 : 2;
for (i = 0; i < Count; i++)
{
Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &Pfn[i]);
if (!NT_SUCCESS(Status))
{
for (j = 0; j < i; j++)
{
MmReleasePageMemoryConsumer(MC_NPPOOL, Pfn[j]);
}
return FALSE;
}
}
if (Ke386Pae)
{
PULONGLONG PageDirTable;
PULONGLONG PageDir;
PageDirTable = MmCreateHyperspaceMapping(Pfn[0]);
for (i = 0; i < 4; i++)
{
PageDirTable[i] = PAE_PFN_TO_PTE(Pfn[1+i]) | PA_PRESENT;
}
MmDeleteHyperspaceMapping(PageDirTable);
for (i = PAE_ADDR_TO_PDTE_OFFSET(MmSystemRangeStart); i < 4; i++)
{
PageDir = (PULONGLONG)MmCreateHyperspaceMapping(Pfn[i+1]);
memcpy(PageDir, &MmGlobalKernelPageDirectoryForPAE[i * 512], 512 * sizeof(ULONGLONG));
if (PAE_ADDR_TO_PDTE_OFFSET(PTE_BASE) == i)
{
for (j = 0; j < 4; j++)
{
PageDir[PAE_ADDR_TO_PDE_PAGE_OFFSET(PTE_BASE) + j] = PAE_PFN_TO_PTE(Pfn[1+j]) | PA_PRESENT | PA_READWRITE;
}
}
if (PAE_ADDR_TO_PDTE_OFFSET(HYPERSPACE) == i)
{
PageDir[PAE_ADDR_TO_PDE_PAGE_OFFSET(HYPERSPACE)] = PAE_PFN_TO_PTE(Pfn[5]) | PA_PRESENT | PA_READWRITE;
PageDir[PAE_ADDR_TO_PDE_PAGE_OFFSET(HYPERSPACE)+1] = PAE_PFN_TO_PTE(Pfn[6]) | PA_PRESENT | PA_READWRITE;
}
MmDeleteHyperspaceMapping(PageDir);
}
}
else
{
PULONG PageDirectory;
PageDirectory = MmCreateHyperspaceMapping(Pfn[0]);
memcpy(PageDirectory + ADDR_TO_PDE_OFFSET(MmSystemRangeStart),
MmGlobalKernelPageDirectory + ADDR_TO_PDE_OFFSET(MmSystemRangeStart),
(1024 - ADDR_TO_PDE_OFFSET(MmSystemRangeStart)) * sizeof(ULONG));
DPRINT("Addr %x\n",ADDR_TO_PDE_OFFSET(PTE_BASE));
PageDirectory[ADDR_TO_PDE_OFFSET(PTE_BASE)] = PFN_TO_PTE(Pfn[0]) | PA_PRESENT | PA_READWRITE;
PageDirectory[ADDR_TO_PDE_OFFSET(HYPERSPACE)] = PFN_TO_PTE(Pfn[1]) | PA_PRESENT | PA_READWRITE;
MmDeleteHyperspaceMapping(PageDirectory);
}
DirectoryTableBase->QuadPart = PFN_TO_PTE(Pfn[0]);
DPRINT("Finished MmCopyMmInfo(): %I64x\n", DirectoryTableBase->QuadPart);
return TRUE;
}
VOID
NTAPI
MmFreePageTable(PEPROCESS Process, PVOID Address)
{
PEPROCESS CurrentProcess = PsGetCurrentProcess();
ULONG i;
PFN_NUMBER Pfn;
DPRINT("ProcessId %d, Address %x\n", Process->UniqueProcessId, Address);
if (Process != NULL && Process != CurrentProcess)
{
KeAttachProcess(&Process->Pcb);
}
if (Ke386Pae)
{
PULONGLONG PageTable;
ULONGLONG ZeroPte = 0LL;
PageTable = (PULONGLONG)PAGE_ROUND_DOWN((PVOID)PAE_ADDR_TO_PTE(Address));
for (i = 0; i < 512; i++)
{
if (PageTable[i] != 0LL)
{
DbgPrint("Page table entry not clear at %x/%x (is %I64x)\n",
((ULONG)Address / (4*1024*1024)), i, PageTable[i]);
ASSERT(FALSE);
}
}
Pfn = PAE_PTE_TO_PFN(*(PAE_ADDR_TO_PDE(Address)));
(void)ExfpInterlockedExchange64UL(PAE_ADDR_TO_PDE(Address), &ZeroPte);
MiFlushTlb((PULONG)PAE_ADDR_TO_PDE(Address), PAE_ADDR_TO_PTE(Address));
}
else
{
PULONG PageTable;
PageTable = (PULONG)PAGE_ROUND_DOWN((PVOID)ADDR_TO_PTE(Address));
for (i = 0; i < 1024; i++)
{
if (PageTable[i] != 0)
{
DbgPrint("Page table entry not clear at %x/%x (is %x)\n",
((ULONG)Address / (4*1024*1024)), i, PageTable[i]);
ASSERT(FALSE);
}
}
Pfn = PTE_TO_PFN(*(ADDR_TO_PDE(Address)));
*(ADDR_TO_PDE(Address)) = 0;
MiFlushTlb(ADDR_TO_PDE(Address), ADDR_TO_PTE(Address));
}
if (Address >= MmSystemRangeStart)
{
// MmGlobalKernelPageDirectory[ADDR_TO_PDE_OFFSET(Address)] = 0;
ASSERT(FALSE);
}
else
{
MmReleasePageMemoryConsumer(MC_NPPOOL, Pfn);
}
if (Process != NULL && Process != CurrentProcess)
{
KeDetachProcess();
}
}
static PULONGLONG
MmGetPageTableForProcessForPAE(PEPROCESS Process, PVOID Address, BOOLEAN Create)
{
NTSTATUS Status;
PFN_NUMBER Pfn;
ULONGLONG Entry;
ULONGLONG ZeroEntry = 0LL;
PULONGLONG Pt;
PULONGLONG PageDir;
PULONGLONG PageDirTable;
DPRINT("MmGetPageTableForProcessForPAE(%x %x %d)\n",
Process, Address, Create);
if (Address >= (PVOID)PTE_BASE && Address < (PVOID)((ULONG_PTR)PTE_BASE + 0x800000))
{
ASSERT(FALSE);
}
if (Address < MmSystemRangeStart && Process && Process != PsGetCurrentProcess())
{
PageDirTable = MmCreateHyperspaceMapping(PAE_PTE_TO_PFN(Process->Pcb.DirectoryTableBase.QuadPart));
if (PageDirTable == NULL)
{
ASSERT(FALSE);
}
PageDir = MmCreateHyperspaceMapping(PAE_PTE_TO_PFN(PageDirTable[PAE_ADDR_TO_PDTE_OFFSET(Address)]));
MmDeleteHyperspaceMapping(PageDirTable);
if (PageDir == NULL)
{
ASSERT(FALSE);
}
PageDir += PAE_ADDR_TO_PDE_PAGE_OFFSET(Address);
Entry = ExfInterlockedCompareExchange64UL(PageDir, &ZeroEntry, &ZeroEntry);
if (Entry == 0LL)
{
if (Create == FALSE)
{
MmDeleteHyperspaceMapping(PageDir);
return NULL;
}
Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &Pfn);
if (!NT_SUCCESS(Status))
{
ASSERT(FALSE);
}
Entry = PFN_TO_PTE(Pfn) | PA_PRESENT | PA_READWRITE | PA_USER;
Entry = ExfInterlockedCompareExchange64UL(PageDir, &Entry, &ZeroEntry);
if (Entry != 0LL)
{
MmReleasePageMemoryConsumer(MC_NPPOOL, Pfn);
Pfn = PAE_PTE_TO_PFN(Entry);
}
}
else
{
Pfn = PAE_PTE_TO_PFN(Entry);
}
MmDeleteHyperspaceMapping(PageDir);
Pt = MmCreateHyperspaceMapping(Pfn);
if (Pt == NULL)
{
ASSERT(FALSE);
}
return Pt + PAE_ADDR_TO_PTE_OFFSET(Address);
}
PageDir = PAE_ADDR_TO_PDE(Address);
if (0LL == ExfInterlockedCompareExchange64UL(PageDir, &ZeroEntry, &ZeroEntry))
{
if (Address >= MmSystemRangeStart)
{
if (MmGlobalKernelPageDirectoryForPAE[PAE_ADDR_TO_PDE_OFFSET(Address)] == 0LL)
{
if (Create == FALSE)
{
return NULL;
}
Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &Pfn);
if (!NT_SUCCESS(Status))
{
ASSERT(FALSE);
}
Entry = PAE_PFN_TO_PTE(Pfn) | PA_PRESENT | PA_READWRITE;
if (Ke386GlobalPagesEnabled)
{
Entry |= PA_GLOBAL;
}
if (0LL != ExfInterlockedCompareExchange64UL(&MmGlobalKernelPageDirectoryForPAE[PAE_ADDR_TO_PDE_OFFSET(Address)], &Entry, &ZeroEntry))
{
MmReleasePageMemoryConsumer(MC_NPPOOL, Pfn);
}
}
(void)ExfInterlockedCompareExchange64UL(PageDir, &MmGlobalKernelPageDirectoryForPAE[PAE_ADDR_TO_PDE_OFFSET(Address)], &ZeroEntry);
}
else
{
if (Create == FALSE)
{
return NULL;
}
Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &Pfn);
if (!NT_SUCCESS(Status))
{
ASSERT(FALSE);
}
Entry = PFN_TO_PTE(Pfn) | PA_PRESENT | PA_READWRITE | PA_USER;
Entry = ExfInterlockedCompareExchange64UL(PageDir, &Entry, &ZeroEntry);
if (Entry != 0LL)
{
MmReleasePageMemoryConsumer(MC_NPPOOL, Pfn);
}
}
}
return (PULONGLONG)PAE_ADDR_TO_PTE(Address);
}
static PULONG
MmGetPageTableForProcess(PEPROCESS Process, PVOID Address, BOOLEAN Create)
{
ULONG PdeOffset = ADDR_TO_PDE_OFFSET(Address);
NTSTATUS Status;
PFN_NUMBER Pfn;
ULONG Entry;
PULONG Pt, PageDir;
if (Address < MmSystemRangeStart && Process && Process != PsGetCurrentProcess())
{
PageDir = MmCreateHyperspaceMapping(PTE_TO_PFN(Process->Pcb.DirectoryTableBase.LowPart));
if (PageDir == NULL)
{
ASSERT(FALSE);
}
if (0 == InterlockedCompareExchangeUL(&PageDir[PdeOffset], 0, 0))
{
if (Create == FALSE)
{
MmDeleteHyperspaceMapping(PageDir);
return NULL;
}
Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &Pfn);
if (!NT_SUCCESS(Status) || Pfn == 0)
{
ASSERT(FALSE);
}
Entry = InterlockedCompareExchangeUL(&PageDir[PdeOffset], PFN_TO_PTE(Pfn) | PA_PRESENT | PA_READWRITE | PA_USER, 0);
if (Entry != 0)
{
MmReleasePageMemoryConsumer(MC_NPPOOL, Pfn);
Pfn = PTE_TO_PFN(Entry);
}
}
else
{
Pfn = PTE_TO_PFN(PageDir[PdeOffset]);
}
MmDeleteHyperspaceMapping(PageDir);
Pt = MmCreateHyperspaceMapping(Pfn);
if (Pt == NULL)
{
ASSERT(FALSE);
}
return Pt + ADDR_TO_PTE_OFFSET(Address);
}
PageDir = ADDR_TO_PDE(Address);
if (0 == InterlockedCompareExchangeUL(PageDir, 0, 0))
{
if (Address >= MmSystemRangeStart)
{
if (0 == InterlockedCompareExchangeUL(&MmGlobalKernelPageDirectory[PdeOffset], 0, 0))
{
if (Create == FALSE)
{
return NULL;
}
Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &Pfn);
if (!NT_SUCCESS(Status) || Pfn == 0)
{
ASSERT(FALSE);
}
Entry = PFN_TO_PTE(Pfn) | PA_PRESENT | PA_READWRITE;
if (Ke386GlobalPagesEnabled)
{
Entry |= PA_GLOBAL;
}
if(0 != InterlockedCompareExchangeUL(&MmGlobalKernelPageDirectory[PdeOffset], Entry, 0))
{
MmReleasePageMemoryConsumer(MC_NPPOOL, Pfn);
}
}
(void)InterlockedExchangeUL(PageDir, MmGlobalKernelPageDirectory[PdeOffset]);
}
else
{
if (Create == FALSE)
{
return NULL;
}
Status = MmRequestPageMemoryConsumer(MC_NPPOOL, FALSE, &Pfn);
if (!NT_SUCCESS(Status) || Pfn == 0)
{
ASSERT(FALSE);
}
Entry = InterlockedCompareExchangeUL(PageDir, PFN_TO_PTE(Pfn) | PA_PRESENT | PA_READWRITE | PA_USER, 0);
if (Entry != 0)
{
MmReleasePageMemoryConsumer(MC_NPPOOL, Pfn);
}
}
}
return (PULONG)ADDR_TO_PTE(Address);
}
BOOLEAN MmUnmapPageTable(PULONG Pt)
{
if (Ke386Pae)
{
if ((PULONGLONG)Pt >= (PULONGLONG)PTE_BASE && (PULONGLONG)Pt < (PULONGLONG)PTE_BASE + 4*512*512)
{
return TRUE;
}
}
else
{
if (Pt >= (PULONG)PTE_BASE && Pt < (PULONG)PTE_BASE + 1024*1024)
{
return TRUE;
}
}
if (Pt)
{
MmDeleteHyperspaceMapping((PVOID)PAGE_ROUND_DOWN(Pt));
}
return FALSE;
}
static ULONGLONG MmGetPageEntryForProcessForPAE(PEPROCESS Process, PVOID Address)
{
ULONGLONG Pte;
PULONGLONG Pt;
Pt = MmGetPageTableForProcessForPAE(Process, Address, FALSE);
if (Pt)
{
Pte = *Pt;
MmUnmapPageTable((PULONG)Pt);
return Pte;
}
return 0;
}
static ULONG MmGetPageEntryForProcess(PEPROCESS Process, PVOID Address)
{
ULONG Pte;
PULONG Pt;
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt)
{
Pte = *Pt;
MmUnmapPageTable(Pt);
return Pte;
}
return 0;
}
PFN_NUMBER
NTAPI
MmGetPfnForProcess(PEPROCESS Process,
PVOID Address)
{
if (Ke386Pae)
{
ULONGLONG Entry;
Entry = MmGetPageEntryForProcessForPAE(Process, Address);
if (!(Entry & PA_PRESENT))
{
return 0;
}
return(PAE_PTE_TO_PFN(Entry));
}
else
{
ULONG Entry;
Entry = MmGetPageEntryForProcess(Process, Address);
if (!(Entry & PA_PRESENT))
{
return 0;
}
return(PTE_TO_PFN(Entry));
}
}
VOID
NTAPI
MmDeleteVirtualMapping(PEPROCESS Process, PVOID Address,
BOOLEAN* WasDirty, PPFN_NUMBER Page)
/*
* FUNCTION: Delete a virtual mapping
*/
{
BOOLEAN WasValid = FALSE;
PFN_NUMBER Pfn;
DPRINT("MmDeleteVirtualMapping(%x, %x, %d, %x, %x)\n",
Process, Address, WasDirty, Page);
if (Ke386Pae)
{
ULONGLONG Pte;
PULONGLONG Pt;
Pt = MmGetPageTableForProcessForPAE(Process, Address, FALSE);
if (Pt == NULL)
{
if (WasDirty != NULL)
{
*WasDirty = FALSE;
}
if (Page != NULL)
{
*Page = 0;
}
return;
}
/*
* Atomically set the entry to zero and get the old value.
*/
Pte = 0LL;
Pte = ExfpInterlockedExchange64UL(Pt, &Pte);
MiFlushTlb((PULONG)Pt, Address);
WasValid = PAE_PAGE_MASK(Pte) != 0 ? TRUE : FALSE;
if (WasValid)
{
Pfn = PAE_PTE_TO_PFN(Pte);
MmMarkPageUnmapped(Pfn);
}
else
{
Pfn = 0;
}
/*
* Return some information to the caller
*/
if (WasDirty != NULL)
{
*WasDirty = Pte & PA_DIRTY ? TRUE : FALSE;
}
if (Page != NULL)
{
*Page = Pfn;
}
}
else
{
ULONG Pte;
PULONG Pt;
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
if (WasDirty != NULL)
{
*WasDirty = FALSE;
}
if (Page != NULL)
{
*Page = 0;
}
return;
}
/*
* Atomically set the entry to zero and get the old value.
*/
Pte = InterlockedExchangeUL(Pt, 0);
MiFlushTlb(Pt, Address);
WasValid = (PAGE_MASK(Pte) != 0);
if (WasValid)
{
Pfn = PTE_TO_PFN(Pte);
MmMarkPageUnmapped(Pfn);
}
else
{
Pfn = 0;
}
/*
* Return some information to the caller
*/
if (WasDirty != NULL)
{
*WasDirty = Pte & PA_DIRTY ? TRUE : FALSE;
}
if (Page != NULL)
{
*Page = Pfn;
}
}
/*
* Decrement the reference count for this page table.
*/
if (Process != NULL && WasValid &&
((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable != NULL &&
Address < MmSystemRangeStart)
{
PUSHORT Ptrc;
ULONG Idx;
Ptrc = ((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable;
Idx = Ke386Pae ? PAE_ADDR_TO_PAGE_TABLE(Address) : ADDR_TO_PAGE_TABLE(Address);
Ptrc[Idx]--;
if (Ptrc[Idx] == 0)
{
MmFreePageTable(Process, Address);
}
}
}
VOID
NTAPI
MmDeletePageFileMapping(PEPROCESS Process, PVOID Address,
SWAPENTRY* SwapEntry)
/*
* FUNCTION: Delete a virtual mapping
*/
{
if (Ke386Pae)
{
ULONGLONG Pte;
PULONGLONG Pt;
Pt = MmGetPageTableForProcessForPAE(Process, Address, FALSE);
if (Pt == NULL)
{
*SwapEntry = 0;
return;
}
/*
* Atomically set the entry to zero and get the old value.
*/
Pte = 0LL;
Pte = ExfpInterlockedExchange64UL(Pt, &Pte);
MiFlushTlb((PULONG)Pt, Address);
/*
* Decrement the reference count for this page table.
*/
if (Process != NULL && Pte &&
((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable != NULL &&
Address < MmSystemRangeStart)
{
PUSHORT Ptrc;
Ptrc = ((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable;
Ptrc[PAE_ADDR_TO_PAGE_TABLE(Address)]--;
if (Ptrc[PAE_ADDR_TO_PAGE_TABLE(Address)] == 0)
{
MmFreePageTable(Process, Address);
}
}
/*
* Return some information to the caller
*/
*SwapEntry = Pte >> 1;
}
else
{
ULONG Pte;
PULONG Pt;
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
*SwapEntry = 0;
return;
}
/*
* Atomically set the entry to zero and get the old value.
*/
Pte = InterlockedExchangeUL(Pt, 0);
MiFlushTlb(Pt, Address);
/*
* Decrement the reference count for this page table.
*/
if (Process != NULL && Pte &&
((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable != NULL &&
Address < MmSystemRangeStart)
{
PUSHORT Ptrc;
Ptrc = ((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable;
Ptrc[ADDR_TO_PAGE_TABLE(Address)]--;
if (Ptrc[ADDR_TO_PAGE_TABLE(Address)] == 0)
{
MmFreePageTable(Process, Address);
}
}
/*
* Return some information to the caller
*/
*SwapEntry = Pte >> 1;
}
}
BOOLEAN
Mmi386MakeKernelPageTableGlobal(PVOID PAddress)
{
if (Ke386Pae)
{
PULONGLONG Pt;
PULONGLONG Pde;
Pde = PAE_ADDR_TO_PDE(PAddress);
if (*Pde == 0LL)
{
Pt = MmGetPageTableForProcessForPAE(NULL, PAddress, FALSE);
#if 0
/* Non existing mappings are not cached within the tlb. We must not invalidate this entry */
FLASH_TLB_ONE(PAddress);
#endif
if (Pt != NULL)
{
return TRUE;
}
}
}
else
{
PULONG Pt, Pde;
Pde = ADDR_TO_PDE(PAddress);
if (*Pde == 0)
{
Pt = MmGetPageTableForProcess(NULL, PAddress, FALSE);
#if 0
/* Non existing mappings are not cached within the tlb. We must not invalidate this entry */
FLASH_TLB_ONE(PAddress);
#endif
if (Pt != NULL)
{
return TRUE;
}
}
}
return(FALSE);
}
BOOLEAN
NTAPI
MmIsDirtyPage(PEPROCESS Process, PVOID Address)
{
if (Ke386Pae)
{
return MmGetPageEntryForProcessForPAE(Process, Address) & PA_DIRTY ? TRUE : FALSE;
}
else
{
return MmGetPageEntryForProcess(Process, Address) & PA_DIRTY ? TRUE : FALSE;
}
}
VOID
NTAPI
MmSetCleanPage(PEPROCESS Process, PVOID Address)
{
if (Address < MmSystemRangeStart && Process == NULL)
{
DPRINT1("MmSetCleanPage is called for user space without a process.\n");
ASSERT(FALSE);
}
if (Ke386Pae)
{
PULONGLONG Pt;
ULONGLONG Pte;
ULONGLONG tmpPte;
Pt = MmGetPageTableForProcessForPAE(Process, Address, FALSE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
do
{
Pte = *Pt;
tmpPte = Pte & ~PA_DIRTY;
} while (Pte != ExfInterlockedCompareExchange64UL(Pt, &tmpPte, &Pte));
if (Pte & PA_DIRTY)
{
MiFlushTlb((PULONG)Pt, Address);
}
else
{
MmUnmapPageTable((PULONG)Pt);
}
}
else
{
PULONG Pt;
ULONG Pte;
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
do
{
Pte = *Pt;
} while (Pte != InterlockedCompareExchangeUL(Pt, Pte & ~PA_DIRTY, Pte));
if (Pte & PA_DIRTY)
{
MiFlushTlb(Pt, Address);
}
else
{
MmUnmapPageTable(Pt);
}
}
}
VOID
NTAPI
MmSetDirtyPage(PEPROCESS Process, PVOID Address)
{
if (Address < MmSystemRangeStart && Process == NULL)
{
DPRINT1("MmSetDirtyPage is called for user space without a process.\n");
ASSERT(FALSE);
}
if (Ke386Pae)
{
PULONGLONG Pt;
ULONGLONG Pte;
ULONGLONG tmpPte;
Pt = MmGetPageTableForProcessForPAE(Process, Address, FALSE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
do
{
Pte = *Pt;
tmpPte = Pte | PA_DIRTY;
} while (Pte != ExfInterlockedCompareExchange64UL(Pt, &tmpPte, &Pte));
if (!(Pte & PA_DIRTY))
{
MiFlushTlb((PULONG)Pt, Address);
}
else
{
MmUnmapPageTable((PULONG)Pt);
}
}
else
{
PULONG Pt;
ULONG Pte;
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
do
{
Pte = *Pt;
} while (Pte != InterlockedCompareExchangeUL(Pt, Pte | PA_DIRTY, Pte));
if (!(Pte & PA_DIRTY))
{
MiFlushTlb(Pt, Address);
}
else
{
MmUnmapPageTable(Pt);
}
}
}
BOOLEAN
NTAPI
MmIsPagePresent(PEPROCESS Process, PVOID Address)
{
if (Ke386Pae)
{
return MmGetPageEntryForProcessForPAE(Process, Address) & PA_PRESENT ? TRUE : FALSE;
}
else
{
return MmGetPageEntryForProcess(Process, Address) & PA_PRESENT ? TRUE : FALSE;
}
}
BOOLEAN
NTAPI
MmIsPageSwapEntry(PEPROCESS Process, PVOID Address)
{
if (Ke386Pae)
{
ULONGLONG Entry;
Entry = MmGetPageEntryForProcessForPAE(Process, Address);
return !(Entry & PA_PRESENT) && Entry != 0 ? TRUE : FALSE;
}
else
{
ULONG Entry;
Entry = MmGetPageEntryForProcess(Process, Address);
return !(Entry & PA_PRESENT) && Entry != 0 ? TRUE : FALSE;
}
}
NTSTATUS
NTAPI
MmCreatePageFileMapping(PEPROCESS Process,
PVOID Address,
SWAPENTRY SwapEntry)
{
if (Process == NULL && Address < MmSystemRangeStart)
{
DPRINT1("No process\n");
ASSERT(FALSE);
}
if (Process != NULL && Address >= MmSystemRangeStart)
{
DPRINT1("Setting kernel address with process context\n");
ASSERT(FALSE);
}
if (SwapEntry & (1 << 31))
{
ASSERT(FALSE);
}
if (Ke386Pae)
{
PULONGLONG Pt;
ULONGLONG Pte;
ULONGLONG tmpPte;
Pt = MmGetPageTableForProcessForPAE(Process, Address, TRUE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
tmpPte = SwapEntry << 1;
Pte = ExfpInterlockedExchange64UL(Pt, &tmpPte);
if (PAE_PAGE_MASK((Pte)) != 0)
{
MmMarkPageUnmapped(PAE_PTE_TO_PFN((Pte)));
}
if (Pte != 0)
{
MiFlushTlb((PULONG)Pt, Address);
}
else
{
MmUnmapPageTable((PULONG)Pt);
}
}
else
{
PULONG Pt;
ULONG Pte;
Pt = MmGetPageTableForProcess(Process, Address, TRUE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
Pte = *Pt;
if (PAGE_MASK((Pte)) != 0)
{
MmMarkPageUnmapped(PTE_TO_PFN((Pte)));
}
(void)InterlockedExchangeUL(Pt, SwapEntry << 1);
if (Pte != 0)
{
MiFlushTlb(Pt, Address);
}
else
{
MmUnmapPageTable(Pt);
}
}
if (Process != NULL &&
((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable != NULL &&
Address < MmSystemRangeStart)
{
PUSHORT Ptrc;
ULONG Idx;
Ptrc = ((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable;
Idx = Ke386Pae ? PAE_ADDR_TO_PAGE_TABLE(Address) : ADDR_TO_PAGE_TABLE(Address);
Ptrc[Idx]++;
}
return(STATUS_SUCCESS);
}
NTSTATUS
NTAPI
MmCreateVirtualMappingUnsafe(PEPROCESS Process,
PVOID Address,
ULONG flProtect,
PPFN_NUMBER Pages,
ULONG PageCount)
{
ULONG Attributes;
PVOID Addr;
ULONG i;
ULONG oldPdeOffset, PdeOffset;
BOOLEAN NoExecute = FALSE;
DPRINT("MmCreateVirtualMappingUnsafe(%x, %x, %x, %x (%x), %d)\n",
Process, Address, flProtect, Pages, *Pages, PageCount);
if (Process == NULL)
{
if (Address < MmSystemRangeStart)
{
DPRINT1("No process\n");
ASSERT(FALSE);
}
if (PageCount > 0x10000 ||
(ULONG_PTR) Address / PAGE_SIZE + PageCount > 0x100000)
{
DPRINT1("Page count to large\n");
ASSERT(FALSE);
}
}
else
{
if (Address >= MmSystemRangeStart)
{
DPRINT1("Setting kernel address with process context\n");
ASSERT(FALSE);
}
if (PageCount > (ULONG_PTR)MmSystemRangeStart / PAGE_SIZE ||
(ULONG_PTR) Address / PAGE_SIZE + PageCount >
(ULONG_PTR)MmSystemRangeStart / PAGE_SIZE)
{
DPRINT1("Page Count to large\n");
ASSERT(FALSE);
}
}
Attributes = ProtectToPTE(flProtect);
if (Attributes & 0x80000000)
{
NoExecute = TRUE;
}
Attributes &= 0xfff;
if (Address >= MmSystemRangeStart)
{
Attributes &= ~PA_USER;
if (Ke386GlobalPagesEnabled)
{
Attributes |= PA_GLOBAL;
}
}
else
{
Attributes |= PA_USER;
}
Addr = Address;
if (Ke386Pae)
{
ULONGLONG Pte, tmpPte;
PULONGLONG Pt = NULL;
oldPdeOffset = PAE_ADDR_TO_PDE_OFFSET(Addr) + 1;
for (i = 0; i < PageCount; i++, Addr = (PVOID)((ULONG_PTR)Addr + PAGE_SIZE))
{
if (!(Attributes & PA_PRESENT) && Pages[i] != 0)
{
DPRINT1("Setting physical address but not allowing access at address "
"0x%.8X with attributes %x/%x.\n",
Addr, Attributes, flProtect);
ASSERT(FALSE);
}
PdeOffset = PAE_ADDR_TO_PDE_OFFSET(Addr);
if (oldPdeOffset != PdeOffset)
{
MmUnmapPageTable((PULONG)Pt);
Pt = MmGetPageTableForProcessForPAE(Process, Addr, TRUE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
}
else
{
Pt++;
}
oldPdeOffset = PdeOffset;
MmMarkPageMapped(Pages[i]);
tmpPte = PAE_PFN_TO_PTE(Pages[i]) | Attributes;
if (NoExecute)
{
tmpPte |= 0x8000000000000000LL;
}
Pte = ExfpInterlockedExchange64UL(Pt, &tmpPte);
if (PAE_PAGE_MASK((Pte)) != 0LL && !((Pte) & PA_PRESENT))
{
ASSERT(FALSE);
}
if (PAE_PAGE_MASK((Pte)) != 0LL)
{
MmMarkPageUnmapped(PAE_PTE_TO_PFN((Pte)));
}
if (Address < MmSystemRangeStart &&
((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable != NULL &&
Attributes & PA_PRESENT)
{
PUSHORT Ptrc;
Ptrc = ((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable;
Ptrc[PAE_ADDR_TO_PAGE_TABLE(Addr)]++;
}
if (Pte != 0LL)
{
if (Address > MmSystemRangeStart ||
(Pt >= (PULONGLONG)PTE_BASE && Pt < (PULONGLONG)PTE_BASE + 4*512*512))
{
MiFlushTlb((PULONG)Pt, Address);
}
}
}
if (Addr > Address)
{
MmUnmapPageTable((PULONG)Pt);
}
}
else
{
PULONG Pt = NULL;
ULONG Pte;
oldPdeOffset = ADDR_TO_PDE_OFFSET(Addr) + 1;
for (i = 0; i < PageCount; i++, Addr = (PVOID)((ULONG_PTR)Addr + PAGE_SIZE))
{
if (!(Attributes & PA_PRESENT) && Pages[i] != 0)
{
DPRINT1("Setting physical address but not allowing access at address "
"0x%.8X with attributes %x/%x.\n",
Addr, Attributes, flProtect);
ASSERT(FALSE);
}
PdeOffset = ADDR_TO_PDE_OFFSET(Addr);
if (oldPdeOffset != PdeOffset)
{
MmUnmapPageTable(Pt);
Pt = MmGetPageTableForProcess(Process, Addr, TRUE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
}
else
{
Pt++;
}
oldPdeOffset = PdeOffset;
Pte = *Pt;
MmMarkPageMapped(Pages[i]);
if (PAGE_MASK((Pte)) != 0 && !((Pte) & PA_PRESENT))
{
ASSERT(FALSE);
}
if (PAGE_MASK((Pte)) != 0)
{
MmMarkPageUnmapped(PTE_TO_PFN((Pte)));
}
(void)InterlockedExchangeUL(Pt, PFN_TO_PTE(Pages[i]) | Attributes);
if (Address < MmSystemRangeStart &&
((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable != NULL &&
Attributes & PA_PRESENT)
{
PUSHORT Ptrc;
Ptrc = ((PMADDRESS_SPACE)&Process->VadRoot)->PageTableRefCountTable;
Ptrc[ADDR_TO_PAGE_TABLE(Addr)]++;
}
if (Pte != 0)
{
if (Address > MmSystemRangeStart ||
(Pt >= (PULONG)PTE_BASE && Pt < (PULONG)PTE_BASE + 1024*1024))
{
MiFlushTlb(Pt, Address);
}
}
}
if (Addr > Address)
{
MmUnmapPageTable(Pt);
}
}
return(STATUS_SUCCESS);
}
NTSTATUS
NTAPI
MmCreateVirtualMapping(PEPROCESS Process,
PVOID Address,
ULONG flProtect,
PPFN_NUMBER Pages,
ULONG PageCount)
{
ULONG i;
for (i = 0; i < PageCount; i++)
{
if (!MmIsPageInUse(Pages[i]))
{
DPRINT1("Page at address %x not in use\n", PFN_TO_PTE(Pages[i]));
ASSERT(FALSE);
}
}
return(MmCreateVirtualMappingUnsafe(Process,
Address,
flProtect,
Pages,
PageCount));
}
ULONG
NTAPI
MmGetPageProtect(PEPROCESS Process, PVOID Address)
{
ULONG Entry;
ULONG Protect;
if (Ke386Pae)
{
Entry = MmGetPageEntryForProcessForPAE(Process, Address);
}
else
{
Entry = MmGetPageEntryForProcess(Process, Address);
}
if (!(Entry & PA_PRESENT))
{
Protect = PAGE_NOACCESS;
}
else
{
if (Entry & PA_READWRITE)
{
Protect = PAGE_READWRITE;
}
else
{
Protect = PAGE_EXECUTE_READ;
}
if (Entry & PA_CD)
{
Protect |= PAGE_NOCACHE;
}
if (Entry & PA_WT)
{
Protect |= PAGE_WRITETHROUGH;
}
if (!(Entry & PA_USER))
{
Protect |= PAGE_SYSTEM;
}
}
return(Protect);
}
VOID
NTAPI
MmSetPageProtect(PEPROCESS Process, PVOID Address, ULONG flProtect)
{
ULONG Attributes = 0;
BOOLEAN NoExecute = FALSE;
DPRINT("MmSetPageProtect(Process %x Address %x flProtect %x)\n",
Process, Address, flProtect);
Attributes = ProtectToPTE(flProtect);
if (Attributes & 0x80000000)
{
NoExecute = TRUE;
}
Attributes &= 0xfff;
if (Address >= MmSystemRangeStart)
{
Attributes &= ~PA_USER;
if (Ke386GlobalPagesEnabled)
{
Attributes |= PA_GLOBAL;
}
}
else
{
Attributes |= PA_USER;
}
if (Ke386Pae)
{
PULONGLONG Pt;
ULONGLONG tmpPte, Pte;
Pt = MmGetPageTableForProcessForPAE(Process, Address, FALSE);
if (Pt == NULL)
{
DPRINT1("Address %x\n", Address);
ASSERT(FALSE);
}
do
{
Pte = *Pt;
tmpPte = PAE_PAGE_MASK(Pte) | Attributes | (Pte & (PA_ACCESSED|PA_DIRTY));
if (NoExecute)
{
tmpPte |= 0x8000000000000000LL;
}
else
{
tmpPte &= ~0x8000000000000000LL;
}
} while (Pte != ExfInterlockedCompareExchange64UL(Pt, &tmpPte, &Pte));
MiFlushTlb((PULONG)Pt, Address);
}
else
{
PULONG Pt;
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
ASSERT(FALSE);
}
InterlockedExchange((PLONG)Pt, PAGE_MASK(*Pt) | Attributes | (*Pt & (PA_ACCESSED|PA_DIRTY)));
MiFlushTlb(Pt, Address);
}
}
VOID
INIT_FUNCTION
NTAPI
MmInitGlobalKernelPageDirectory(VOID)
{
ULONG i;
DPRINT("MmInitGlobalKernelPageDirectory()\n");
if (Ke386Pae)
{
PULONGLONG CurrentPageDirectory = (PULONGLONG)PAE_PAGEDIRECTORY_MAP;
for (i = PAE_ADDR_TO_PDE_OFFSET(MmSystemRangeStart); i < 4 * 512; i++)
{
if (!(i >= PAE_ADDR_TO_PDE_OFFSET(PTE_BASE) && i < PAE_ADDR_TO_PDE_OFFSET(PTE_BASE) + 4) &&
!(i >= PAE_ADDR_TO_PDE_OFFSET(HYPERSPACE) && i < PAE_ADDR_TO_PDE_OFFSET(HYPERSPACE) + 2) &&
0LL == MmGlobalKernelPageDirectoryForPAE[i] && 0LL != CurrentPageDirectory[i])
{
(void)ExfpInterlockedExchange64UL(&MmGlobalKernelPageDirectoryForPAE[i], &CurrentPageDirectory[i]);
if (Ke386GlobalPagesEnabled)
{
MmGlobalKernelPageDirectoryForPAE[i] |= PA_GLOBAL;
CurrentPageDirectory[i] |= PA_GLOBAL;
}
}
}
}
else
{
PULONG CurrentPageDirectory = (PULONG)PAGEDIRECTORY_MAP;
for (i = ADDR_TO_PDE_OFFSET(MmSystemRangeStart); i < 1024; i++)
{
if (i != ADDR_TO_PDE_OFFSET(PTE_BASE) &&
i != ADDR_TO_PDE_OFFSET(HYPERSPACE) &&
0 == MmGlobalKernelPageDirectory[i] && 0 != CurrentPageDirectory[i])
{
MmGlobalKernelPageDirectory[i] = CurrentPageDirectory[i];
if (Ke386GlobalPagesEnabled)
{
MmGlobalKernelPageDirectory[i] |= PA_GLOBAL;
CurrentPageDirectory[i] |= PA_GLOBAL;
}
}
}
}
}
/* EOF */
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