164 lines
3.0 KiB
C
164 lines
3.0 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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debugsup.c
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Abstract:
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This module contains routines which provide support for the
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kernel debugger.
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Author:
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Lou Perazzoli (loup) 02-Aug-90
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Revision History:
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--*/
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#include "mi.h"
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PVOID
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MmDbgReadCheck (
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IN PVOID VirtualAddress
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)
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/*++
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Routine Description:
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i386/486 implementation specific:
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This routine checks the specified virtual address and if it is
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valid and readable, it returns that virtual address, otherwise
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it returns NULL.
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Arguments:
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VirtualAddress - Supplies the virtual address to check.
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Return Value:
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Returns NULL if the address is not valid or readable, otherwise
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returns the virtual address of the corresponding virtual address.
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Environment:
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Kernel mode IRQL at DISPATCH_LEVEL or greater.
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--*/
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{
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if (!MmIsAddressValid (VirtualAddress)) {
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return NULL;
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}
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return VirtualAddress;
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}
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PVOID
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MmDbgWriteCheck (
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IN PVOID VirtualAddress
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)
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/*++
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Routine Description:
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i386/486 implementation specific:
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This routine checks the specified virtual address and if it is
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valid and writeable, it returns that virtual address, otherwise
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it returns NULL.
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Arguments:
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VirtualAddress - Supplies the virtual address to check.
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Return Value:
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Returns NULL if the address is not valid or writable, otherwise
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returns the virtual address of the corresponding virtual address.
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Environment:
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Kernel mode IRQL at DISPATCH_LEVEL or greater.
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--*/
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{
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PMMPTE PointerPte;
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if (!MmIsAddressValid (VirtualAddress)) {
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return NULL;
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}
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PointerPte = MiGetPdeAddress (VirtualAddress);
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if (PointerPte->u.Hard.LargePage == 0) {
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PointerPte = MiGetPteAddress (VirtualAddress);
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}
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if ((PointerPte->u.Hard.Write == 0) &&
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((PointerPte->u.Long & HARDWARE_PTE_DIRTY_MASK) == 0)) {
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//
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// PTE is not writable, return NULL.
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//
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return NULL;
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}
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return VirtualAddress;
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}
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PVOID
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MmDbgTranslatePhysicalAddress (
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IN PHYSICAL_ADDRESS PhysicalAddress
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)
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/*++
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Routine Description:
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i386/486 implementation specific:
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This routine maps the specified physical address and returns
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the virtual address which maps the physical address.
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The next call to MmDbgTranslatePhyiscalAddress removes the
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previous phyiscal address translation, hence on a single
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physical address can be examined at a time (can't cross page
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boundaries).
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Arguments:
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PhysicalAddress - Supplies the phyiscal address to map and translate.
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Return Value:
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The virtual address which corresponds to the phyiscal address.
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Environment:
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Kernel mode IRQL at DISPATCH_LEVEL or greater.
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--*/
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{
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PVOID BaseAddress;
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BaseAddress = MiGetVirtualAddressMappedByPte (MmDebugPte);
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KiFlushSingleTb (TRUE, BaseAddress);
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*MmDebugPte = ValidKernelPte;
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MmDebugPte->u.Hard.PageFrameNumber = PhysicalAddress.LowPart >> PAGE_SHIFT;
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return (PVOID)((ULONG)BaseAddress + BYTE_OFFSET(PhysicalAddress.LowPart));
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}
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