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reactos/ntoskrnl/mm/i386/page.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/mm/i386/page.c
* PURPOSE: Low level memory managment manipulation
*
* PROGRAMMERS: David Welch (welch@cwcom.net)
*/
/* INCLUDES ***************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#include <mm/ARM3/miarm.h>
#if defined (ALLOC_PRAGMA)
#pragma alloc_text(INIT, MmInitGlobalKernelPageDirectory)
#endif
#define ADDR_TO_PDE_OFFSET MiAddressToPdeOffset
#define ADDR_TO_PAGE_TABLE(v) (((ULONG)(v)) / (1024 * PAGE_SIZE))
/* 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 IS_HYPERSPACE(v) (((ULONG)(v) >= HYPER_SPACE && (ULONG)(v) <= HYPER_SPACE_END))
#define PTE_TO_PFN(X) ((X) >> PAGE_SHIFT)
#define PFN_TO_PTE(X) ((X) << PAGE_SHIFT)
#define PAGE_MASK(x) ((x)&(~0xfff))
const
ULONG
MmProtectToPteMask[32] =
{
//
// These are the base MM_ protection flags
//
0,
PTE_READONLY | PTE_ENABLE_CACHE,
PTE_EXECUTE | PTE_ENABLE_CACHE,
PTE_EXECUTE_READ | PTE_ENABLE_CACHE,
PTE_READWRITE | PTE_ENABLE_CACHE,
PTE_WRITECOPY | PTE_ENABLE_CACHE,
PTE_EXECUTE_READWRITE | PTE_ENABLE_CACHE,
PTE_EXECUTE_WRITECOPY | PTE_ENABLE_CACHE,
//
// These OR in the MM_NOCACHE flag
//
0,
PTE_READONLY | PTE_DISABLE_CACHE,
PTE_EXECUTE | PTE_DISABLE_CACHE,
PTE_EXECUTE_READ | PTE_DISABLE_CACHE,
PTE_READWRITE | PTE_DISABLE_CACHE,
PTE_WRITECOPY | PTE_DISABLE_CACHE,
PTE_EXECUTE_READWRITE | PTE_DISABLE_CACHE,
PTE_EXECUTE_WRITECOPY | PTE_DISABLE_CACHE,
//
// These OR in the MM_DECOMMIT flag, which doesn't seem supported on x86/64/ARM
//
0,
PTE_READONLY | PTE_ENABLE_CACHE,
PTE_EXECUTE | PTE_ENABLE_CACHE,
PTE_EXECUTE_READ | PTE_ENABLE_CACHE,
PTE_READWRITE | PTE_ENABLE_CACHE,
PTE_WRITECOPY | PTE_ENABLE_CACHE,
PTE_EXECUTE_READWRITE | PTE_ENABLE_CACHE,
PTE_EXECUTE_WRITECOPY | PTE_ENABLE_CACHE,
//
// These OR in the MM_NOACCESS flag, which seems to enable WriteCombining?
//
0,
PTE_READONLY | PTE_WRITECOMBINED_CACHE,
PTE_EXECUTE | PTE_WRITECOMBINED_CACHE,
PTE_EXECUTE_READ | PTE_WRITECOMBINED_CACHE,
PTE_READWRITE | PTE_WRITECOMBINED_CACHE,
PTE_WRITECOPY | PTE_WRITECOMBINED_CACHE,
PTE_EXECUTE_READWRITE | PTE_WRITECOMBINED_CACHE,
PTE_EXECUTE_WRITECOPY | PTE_WRITECOMBINED_CACHE,
};
const
ULONG MmProtectToValue[32] =
{
PAGE_NOACCESS,
PAGE_READONLY,
PAGE_EXECUTE,
PAGE_EXECUTE_READ,
PAGE_READWRITE,
PAGE_WRITECOPY,
PAGE_EXECUTE_READWRITE,
PAGE_EXECUTE_WRITECOPY,
PAGE_NOACCESS,
PAGE_NOCACHE | PAGE_READONLY,
PAGE_NOCACHE | PAGE_EXECUTE,
PAGE_NOCACHE | PAGE_EXECUTE_READ,
PAGE_NOCACHE | PAGE_READWRITE,
PAGE_NOCACHE | PAGE_WRITECOPY,
PAGE_NOCACHE | PAGE_EXECUTE_READWRITE,
PAGE_NOCACHE | PAGE_EXECUTE_WRITECOPY,
PAGE_NOACCESS,
PAGE_GUARD | PAGE_READONLY,
PAGE_GUARD | PAGE_EXECUTE,
PAGE_GUARD | PAGE_EXECUTE_READ,
PAGE_GUARD | PAGE_READWRITE,
PAGE_GUARD | PAGE_WRITECOPY,
PAGE_GUARD | PAGE_EXECUTE_READWRITE,
PAGE_GUARD | PAGE_EXECUTE_WRITECOPY,
PAGE_NOACCESS,
PAGE_WRITECOMBINE | PAGE_READONLY,
PAGE_WRITECOMBINE | PAGE_EXECUTE,
PAGE_WRITECOMBINE | PAGE_EXECUTE_READ,
PAGE_WRITECOMBINE | PAGE_READWRITE,
PAGE_WRITECOMBINE | PAGE_WRITECOPY,
PAGE_WRITECOMBINE | PAGE_EXECUTE_READWRITE,
PAGE_WRITECOMBINE | PAGE_EXECUTE_WRITECOPY
};
/* FUNCTIONS ***************************************************************/
static BOOLEAN MmUnmapPageTable(PULONG Pt);
VOID
MiFlushTlb(PULONG Pt, PVOID Address)
{
if ((Pt && MmUnmapPageTable(Pt)) || Address >= MmSystemRangeStart)
{
KeInvalidateTlbEntry(Address);
}
}
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");
KeBugCheck(MEMORY_MANAGEMENT);
}
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);
}
NTSTATUS
NTAPI
MiDispatchFault(IN ULONG FaultCode,
IN PVOID Address,
IN PMMPTE PointerPte,
IN PMMPTE PointerProtoPte,
IN BOOLEAN Recursive,
IN PEPROCESS Process,
IN PVOID TrapInformation,
IN PVOID Vad);
NTSTATUS
NTAPI
MiFillSystemPageDirectory(IN PVOID Base,
IN SIZE_T NumberOfBytes);
static PULONG
MmGetPageTableForProcess(PEPROCESS Process, PVOID Address, BOOLEAN Create)
{
PFN_NUMBER Pfn;
PULONG Pt;
PMMPDE PointerPde;
if (Address < MmSystemRangeStart)
{
/* We should have a process for user land addresses */
ASSERT(Process != NULL);
if(Process != PsGetCurrentProcess())
{
PMMPDE PdeBase;
ULONG PdeOffset = MiGetPdeOffset(Address);
/* Nobody but page fault should ask for creating the PDE,
* Which imples that Process is the current one */
ASSERT(Create == FALSE);
PdeBase = MmCreateHyperspaceMapping(PTE_TO_PFN(Process->Pcb.DirectoryTableBase[0]));
if (PdeBase == NULL)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
PointerPde = PdeBase + PdeOffset;
if (PointerPde->u.Hard.Valid == 0)
{
MmDeleteHyperspaceMapping(PdeBase);
return NULL;
}
else
{
Pfn = PointerPde->u.Hard.PageFrameNumber;
}
MmDeleteHyperspaceMapping(PdeBase);
Pt = MmCreateHyperspaceMapping(Pfn);
if (Pt == NULL)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
return Pt + MiAddressToPteOffset(Address);
}
/* This is for our process */
PointerPde = MiAddressToPde(Address);
Pt = (PULONG)MiAddressToPte(Address);
if (PointerPde->u.Hard.Valid == 0)
{
NTSTATUS Status;
if (Create == FALSE)
{
return NULL;
}
ASSERT(PointerPde->u.Long == 0);
MI_WRITE_INVALID_PTE(PointerPde, DemandZeroPde);
// Tiny HACK: Parameter 1 is the architecture specific FaultCode for an access violation (i.e. page is present)
Status = MiDispatchFault(0x1,
Pt,
PointerPde,
NULL,
FALSE,
PsGetCurrentProcess(),
NULL,
NULL);
DBG_UNREFERENCED_LOCAL_VARIABLE(Status);
ASSERT(KeAreAllApcsDisabled() == TRUE);
ASSERT(PointerPde->u.Hard.Valid == 1);
}
return (PULONG)MiAddressToPte(Address);
}
/* This is for kernel land address */
ASSERT(Process == NULL);
PointerPde = MiAddressToPde(Address);
Pt = (PULONG)MiAddressToPte(Address);
if (PointerPde->u.Hard.Valid == 0)
{
/* Let ARM3 synchronize the PDE */
if(!MiSynchronizeSystemPde(PointerPde))
{
/* PDE (still) not valid, let ARM3 allocate one if asked */
if(Create == FALSE)
return NULL;
MiFillSystemPageDirectory(Address, PAGE_SIZE);
}
}
return Pt;
}
static BOOLEAN MmUnmapPageTable(PULONG Pt)
{
if (!IS_HYPERSPACE(Pt))
{
return TRUE;
}
if (Pt)
{
MmDeleteHyperspaceMapping((PVOID)PAGE_ROUND_DOWN(Pt));
}
return FALSE;
}
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)
{
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;
ULONG Pte;
PULONG Pt;
DPRINT("MmDeleteVirtualMapping(%p, %p, %p, %p)\n",
Process, Address, WasDirty, Page);
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 = InterlockedExchangePte(Pt, 0);
/* We count a mapping as valid if it's a present page, or it's a nonzero pfn with
* the swap bit unset, indicating a valid page protected to PAGE_NOACCESS. */
WasValid = (Pte & PA_PRESENT) || ((Pte >> PAGE_SHIFT) && !(Pte & 0x800));
if (WasValid)
{
/* Flush the TLB since we transitioned this PTE
* from valid to invalid so any stale translations
* are removed from the cache */
MiFlushTlb(Pt, Address);
if (Address < MmSystemRangeStart)
{
/* Remove PDE reference */
Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Address)]--;
ASSERT(Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Address)] < PTE_COUNT);
}
Pfn = PTE_TO_PFN(Pte);
}
else
{
MmUnmapPageTable(Pt);
Pfn = 0;
}
/*
* Return some information to the caller
*/
if (WasDirty != NULL)
{
*WasDirty = ((Pte & PA_DIRTY) && (Pte & PA_PRESENT)) ? TRUE : FALSE;
}
if (Page != NULL)
{
*Page = Pfn;
}
}
VOID
NTAPI
MmGetPageFileMapping(PEPROCESS Process, PVOID Address,
SWAPENTRY* SwapEntry)
/*
* FUNCTION: Get a page file mapping
*/
{
ULONG Entry = MmGetPageEntryForProcess(Process, Address);
*SwapEntry = Entry >> 1;
}
VOID
NTAPI
MmDeletePageFileMapping(PEPROCESS Process, PVOID Address,
SWAPENTRY* SwapEntry)
/*
* FUNCTION: Delete a virtual mapping
*/
{
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 = InterlockedExchangePte(Pt, 0);
if (Address < MmSystemRangeStart)
{
/* Remove PDE reference */
Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Address)]--;
ASSERT(Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Address)] < PTE_COUNT);
}
/* We don't need to flush here because page file entries
* are invalid translations, so the processor won't cache them */
MmUnmapPageTable(Pt);
if ((Pte & PA_PRESENT) || !(Pte & 0x800))
{
DPRINT1("Pte %x (want not 1 and 0x800)\n", Pte);
KeBugCheck(MEMORY_MANAGEMENT);
}
/*
* Return some information to the caller
*/
*SwapEntry = Pte >> 1;
}
BOOLEAN
Mmi386MakeKernelPageTableGlobal(PVOID Address)
{
PMMPDE PointerPde = MiAddressToPde(Address);
PMMPTE PointerPte = MiAddressToPte(Address);
if (PointerPde->u.Hard.Valid == 0)
{
if(!MiSynchronizeSystemPde(PointerPde))
return FALSE;
return PointerPte->u.Hard.Valid != 0;
}
return FALSE;
}
BOOLEAN
NTAPI
MmIsDirtyPage(PEPROCESS Process, PVOID Address)
{
return MmGetPageEntryForProcess(Process, Address) & PA_DIRTY ? TRUE : FALSE;
}
VOID
NTAPI
MmSetCleanPage(PEPROCESS Process, PVOID Address)
{
PULONG Pt;
ULONG Pte;
if (Address < MmSystemRangeStart && Process == NULL)
{
DPRINT1("MmSetCleanPage is called for user space without a process.\n");
KeBugCheck(MEMORY_MANAGEMENT);
}
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
do
{
Pte = *Pt;
} while (Pte != InterlockedCompareExchangePte(Pt, Pte & ~PA_DIRTY, Pte));
if (!(Pte & PA_PRESENT))
{
KeBugCheck(MEMORY_MANAGEMENT);
}
else if (Pte & PA_DIRTY)
{
MiFlushTlb(Pt, Address);
}
else
{
MmUnmapPageTable(Pt);
}
}
VOID
NTAPI
MmSetDirtyPage(PEPROCESS Process, PVOID Address)
{
PULONG Pt;
ULONG Pte;
if (Address < MmSystemRangeStart && Process == NULL)
{
DPRINT1("MmSetDirtyPage is called for user space without a process.\n");
KeBugCheck(MEMORY_MANAGEMENT);
}
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
do
{
Pte = *Pt;
} while (Pte != InterlockedCompareExchangePte(Pt, Pte | PA_DIRTY, Pte));
if (!(Pte & PA_PRESENT))
{
KeBugCheck(MEMORY_MANAGEMENT);
}
else
{
/* The processor will never clear this bit itself, therefore
* we do not need to flush the TLB here when setting it */
MmUnmapPageTable(Pt);
}
}
BOOLEAN
NTAPI
MmIsPagePresent(PEPROCESS Process, PVOID Address)
{
return MmGetPageEntryForProcess(Process, Address) & PA_PRESENT;
}
BOOLEAN
NTAPI
MmIsDisabledPage(PEPROCESS Process, PVOID Address)
{
ULONG_PTR Entry = MmGetPageEntryForProcess(Process, Address);
return !(Entry & PA_PRESENT) && !(Entry & 0x800) && (Entry >> PAGE_SHIFT);
}
BOOLEAN
NTAPI
MmIsPageSwapEntry(PEPROCESS Process, PVOID Address)
{
ULONG Entry;
Entry = MmGetPageEntryForProcess(Process, Address);
return !(Entry & PA_PRESENT) && (Entry & 0x800);
}
NTSTATUS
NTAPI
MmCreatePageFileMapping(PEPROCESS Process,
PVOID Address,
SWAPENTRY SwapEntry)
{
PULONG Pt;
ULONG Pte;
if (Process == NULL && Address < MmSystemRangeStart)
{
DPRINT1("No process\n");
KeBugCheck(MEMORY_MANAGEMENT);
}
if (Process != NULL && Address >= MmSystemRangeStart)
{
DPRINT1("Setting kernel address with process context\n");
KeBugCheck(MEMORY_MANAGEMENT);
}
if (SwapEntry & (1 << 31))
{
KeBugCheck(MEMORY_MANAGEMENT);
}
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
/* Nobody should page out an address that hasn't even been mapped */
/* But we might place a wait entry first, requiring the page table */
if (SwapEntry != MM_WAIT_ENTRY)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
Pt = MmGetPageTableForProcess(Process, Address, TRUE);
}
Pte = InterlockedExchangePte(Pt, SwapEntry << 1);
if (Pte != 0)
{
KeBugCheckEx(MEMORY_MANAGEMENT, SwapEntry, (ULONG_PTR)Process, (ULONG_PTR)Address, 0);
}
if (Address < MmSystemRangeStart)
{
/* Add PDE reference */
Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Address)]++;
ASSERT(Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Address)] <= PTE_COUNT);
}
/* We don't need to flush the TLB here because it
* only caches valid translations and a zero PTE
* is not a valid translation */
MmUnmapPageTable(Pt);
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;
PULONG Pt = NULL;
ULONG Pte;
DPRINT("MmCreateVirtualMappingUnsafe(%p, %p, %lu, %p (%x), %lu)\n",
Process, Address, flProtect, Pages, *Pages, PageCount);
ASSERT(((ULONG_PTR)Address % PAGE_SIZE) == 0);
if (Process == NULL)
{
if (Address < MmSystemRangeStart)
{
DPRINT1("NULL process given for user-mode mapping at %p -- %lu pages starting at %Ix\n", Address, PageCount, *Pages);
KeBugCheck(MEMORY_MANAGEMENT);
}
if (PageCount > 0x10000 ||
(ULONG_PTR) Address / PAGE_SIZE + PageCount > 0x100000)
{
DPRINT1("Page count too large for kernel-mode mapping at %p -- %lu pages starting at %Ix\n", Address, PageCount, *Pages);
KeBugCheck(MEMORY_MANAGEMENT);
}
}
else
{
if (Address >= MmSystemRangeStart)
{
DPRINT1("Process %p given for kernel-mode mapping at %p -- %lu pages starting at %Ix\n", Process, Address, PageCount, *Pages);
KeBugCheck(MEMORY_MANAGEMENT);
}
if (PageCount > (ULONG_PTR)MmSystemRangeStart / PAGE_SIZE ||
(ULONG_PTR) Address / PAGE_SIZE + PageCount >
(ULONG_PTR)MmSystemRangeStart / PAGE_SIZE)
{
DPRINT1("Page count too large for process %p user-mode mapping at %p -- %lu pages starting at %Ix\n", Process, Address, PageCount, *Pages);
KeBugCheck(MEMORY_MANAGEMENT);
}
}
Attributes = ProtectToPTE(flProtect);
Attributes &= 0xfff;
if (Address >= MmSystemRangeStart)
{
Attributes &= ~PA_USER;
}
else
{
Attributes |= PA_USER;
}
Addr = Address;
/* MmGetPageTableForProcess should be called on the first run, so
* let this trigger it */
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%p with attributes %x/%x.\n",
Addr, Attributes, flProtect);
KeBugCheck(MEMORY_MANAGEMENT);
}
PdeOffset = ADDR_TO_PDE_OFFSET(Addr);
if (oldPdeOffset != PdeOffset)
{
if(Pt) MmUnmapPageTable(Pt);
Pt = MmGetPageTableForProcess(Process, Addr, TRUE);
if (Pt == NULL)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
}
else
{
Pt++;
}
oldPdeOffset = PdeOffset;
Pte = InterlockedExchangePte(Pt, PFN_TO_PTE(Pages[i]) | Attributes);
/* There should not be anything valid here */
if (Pte != 0)
{
DPRINT1("Bad PTE %lx at %p for %p + %lu\n", Pte, Pt, Address, i);
KeBugCheck(MEMORY_MANAGEMENT);
}
/* We don't need to flush the TLB here because it only caches valid translations
* and we're moving this PTE from invalid to valid so it can't be cached right now */
if (Addr < MmSystemRangeStart)
{
/* Add PDE reference */
Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Addr)]++;
ASSERT(Process->Vm.VmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Addr)] <= PTE_COUNT);
}
}
ASSERT(Addr > Address);
MmUnmapPageTable(Pt);
return(STATUS_SUCCESS);
}
NTSTATUS
NTAPI
MmCreateVirtualMapping(PEPROCESS Process,
PVOID Address,
ULONG flProtect,
PPFN_NUMBER Pages,
ULONG PageCount)
{
ULONG i;
ASSERT((ULONG_PTR)Address % PAGE_SIZE == 0);
for (i = 0; i < PageCount; i++)
{
if (!MmIsPageInUse(Pages[i]))
{
DPRINT1("Page at address %x not in use\n", PFN_TO_PTE(Pages[i]));
KeBugCheck(MEMORY_MANAGEMENT);
}
}
return(MmCreateVirtualMappingUnsafe(Process,
Address,
flProtect,
Pages,
PageCount));
}
ULONG
NTAPI
MmGetPageProtect(PEPROCESS Process, PVOID Address)
{
ULONG Entry;
ULONG Protect;
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;
PULONG Pt;
ULONG Pte;
DPRINT("MmSetPageProtect(Process %p Address %p flProtect %x)\n",
Process, Address, flProtect);
Attributes = ProtectToPTE(flProtect);
Attributes &= 0xfff;
if (Address >= MmSystemRangeStart)
{
Attributes &= ~PA_USER;
}
else
{
Attributes |= PA_USER;
}
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
KeBugCheck(MEMORY_MANAGEMENT);
}
Pte = InterlockedExchangePte(Pt, PAGE_MASK(*Pt) | Attributes | (*Pt & (PA_ACCESSED|PA_DIRTY)));
// We should be able to bring a page back from PAGE_NOACCESS
if ((Pte & 0x800) || !(Pte >> PAGE_SHIFT))
{
DPRINT1("Invalid Pte %lx\n", Pte);
KeBugCheck(MEMORY_MANAGEMENT);
}
if((Pte & Attributes) != Attributes)
MiFlushTlb(Pt, Address);
else
MmUnmapPageTable(Pt);
}
VOID
INIT_FUNCTION
NTAPI
MmInitGlobalKernelPageDirectory(VOID)
{
/* Nothing to do here */
}
/* EOF */
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