procsup.c File Reference

#include <ntoskrnl.h>
#include <debug.h>
#include <mm/ARM3/miarm.h>

Include dependency graph for procsup.c:

Go to the source code of this file.

Macros
#define	NDEBUG
#define	MODULE_INVOLVED_IN_ARM3

Functions
BOOLEAN	MiArchCreateProcessAddressSpace (_In_ PEPROCESS Process, _In_ PULONG_PTR DirectoryTableBase)

Macro Definition Documentation

MODULE_INVOLVED_IN_ARM3

#define MODULE_INVOLVED_IN_ARM3

Definition at line 17 of file procsup.c.

NDEBUG

#define NDEBUG

Definition at line 14 of file procsup.c.

Function Documentation

MiArchCreateProcessAddressSpace()

BOOLEAN MiArchCreateProcessAddressSpace	(	_In_ PEPROCESS	Process,
		_In_ PULONG_PTR	DirectoryTableBase
	)

Definition at line 21 of file procsup.c.

{
    KIRQL OldIrql;
    PFN_NUMBER TableBasePfn, HyperPfn, HyperPdPfn, HyperPtPfn;
    PMMPTE SystemPte;
    MMPTE TempPte, PdePte;
    ULONG TableIndex;
    PMMPTE PageTablePointer;
    ULONG PageColor;
 
    /* Non-arch specific code-path allocated those for us */
    TableBasePfn = DirectoryTableBase[0] >> PAGE_SHIFT;
    HyperPfn = DirectoryTableBase[1] >> PAGE_SHIFT;
 
    /*
     * Lock PFN database. Try getting zero pages.
     * If that doesn't work, we take the slow path
     * outside of the PFN lock.
     */
    OldIrql = MiAcquirePfnLock();
    PageColor = MI_GET_NEXT_PROCESS_COLOR(Process);
    HyperPdPfn = MiRemoveZeroPageSafe(PageColor);
    if(!HyperPdPfn)
    {
        HyperPdPfn = MiRemoveAnyPage(PageColor);
        MiReleasePfnLock(OldIrql);
        MiZeroPhysicalPage(HyperPdPfn);
        OldIrql = MiAcquirePfnLock();
    }
    PageColor = MI_GET_NEXT_PROCESS_COLOR(Process);
    HyperPtPfn = MiRemoveZeroPageSafe(PageColor);
    if(!HyperPtPfn)
    {
        HyperPtPfn = MiRemoveAnyPage(PageColor);
        MiReleasePfnLock(OldIrql);
        MiZeroPhysicalPage(HyperPtPfn);
    }
    else
    {
        MiReleasePfnLock(OldIrql);
    }
 
    /* Get a PTE to map the page directory */
    SystemPte = MiReserveSystemPtes(1, SystemPteSpace);
    if (!SystemPte)
        return FALSE;
 
    /* Get its address */
    PageTablePointer = MiPteToAddress(SystemPte);
 
    /* Build the PTE for the page directory and map it */
    MI_MAKE_HARDWARE_PTE_KERNEL(&PdePte, SystemPte, MM_READWRITE, TableBasePfn);
    MI_WRITE_VALID_PTE(SystemPte, PdePte);
 
    /* Copy the kernel mappings and zero out the rest */
    TableIndex = PXE_PER_PAGE / 2;
    RtlZeroMemory(PageTablePointer, TableIndex * sizeof(MMPTE));
    RtlCopyMemory(PageTablePointer + TableIndex,
                  MiAddressToPxe(0) + TableIndex,
                  PAGE_SIZE - TableIndex * sizeof(MMPTE));
 
    /* Sanity check */
    ASSERT(MiAddressToPxi(MmHyperSpaceEnd) >= TableIndex);
 
    /* Setup a PTE for the page directory mappings */
    TempPte = ValidKernelPte;
 
    /* Update the self mapping of the PML4 */
    TableIndex = MiAddressToPxi((PVOID)PXE_SELFMAP);
    TempPte.u.Hard.PageFrameNumber = TableBasePfn;
    PageTablePointer[TableIndex] = TempPte;
 
    /* Write the PML4 entry for hyperspace */
    TableIndex = MiAddressToPxi((PVOID)HYPER_SPACE);
    TempPte.u.Hard.PageFrameNumber = HyperPfn;
    PageTablePointer[TableIndex] = TempPte;
 
    /* Map the hyperspace PDPT to the system PTE */
    PdePte.u.Hard.PageFrameNumber = HyperPfn;
    *SystemPte = PdePte;
    __invlpg(PageTablePointer);
 
    /* Write the hyperspace entry for the first PD */
    TempPte.u.Hard.PageFrameNumber = HyperPdPfn;
    PageTablePointer[0] = TempPte;
 
    /* Map the hyperspace PD to the system PTE */
    PdePte.u.Hard.PageFrameNumber = HyperPdPfn;
    *SystemPte = PdePte;
    __invlpg(PageTablePointer);
 
    /* Write the hyperspace entry for the first PT */
    TempPte.u.Hard.PageFrameNumber = HyperPtPfn;
    PageTablePointer[0] = TempPte;
 
    /* Map the hyperspace PT to the system PTE */
    PdePte.u.Hard.PageFrameNumber = HyperPtPfn;
    *SystemPte = PdePte;
    __invlpg(PageTablePointer);
 
    /* Write the hyperspace PTE for the working set list index */
    TempPte.u.Hard.PageFrameNumber = Process->WorkingSetPage;
    TableIndex = MiAddressToPti(MmWorkingSetList);
    PageTablePointer[TableIndex] = TempPte;
 
    /* Release the system PTE */
    MiReleaseSystemPtes(SystemPte, 1, SystemPteSpace);
 
    return TRUE;
}

Referenced by MmCreateProcessAddressSpace().