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112 lines
2.7 KiB
112 lines
2.7 KiB
#include <string.h>
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#include <xxsetjmp.h>
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#include "ntsdp.h"
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#include <ntos.h>
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#include "axp21064.h" // define processor-specific structures
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#define PMMPTE ULONG
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#define PDE_TOP 0xC01FFFFF
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#define MM_PTE_PROTOTYPE_MASK (0x2)
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#define MM_PTE_TRANSITION_MASK (0x4)
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#define MiGetPdeAddress(va) \
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((PMMPTE)(((((ULONG)(va)) >> PDI_SHIFT) << 2) + PDE_BASE))
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#define MiGetPteAddress(va) \
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((PMMPTE)(((((ULONG)(va)) >> PTI_SHIFT) << 2) + PTE_BASE))
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BOOLEAN KdConvertToPhysicalAddr (
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IN PVOID uAddress,
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OUT PPHYSICAL_ADDRESS PhysicalAddress
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)
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/*++
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Routine Description:
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Convert a virtual address to a physical one.
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Note: that this function is called from within the virtual memory
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cache code. This function can read from the virtual memory cache
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so long as it only read's PDE's and PTE's and so long as it fails
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to convert a PDE or PTE virtual address.
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Arguments:
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uAddress - address to convert
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PhysicalAddress - returned physical address
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Return Value:
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TRUE - physical address was returned
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otherwise, FALSE
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--*/
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{
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ULONG Address;
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PMMPTE Pte;
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PMMPTE Pde;
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ULONG PdeContents;
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ULONG PteContents;
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NTSTATUS status;
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ULONG result;
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Address = (ULONG) uAddress;
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if (Address >= PTE_BASE && Address < PDE_TOP) {
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//
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// The address is the address of a PTE, rather than
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// a virtual address. DO NOT CONVERT IT.
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//
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return FALSE;
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}
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Pde = MiGetPdeAddress (Address);
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Pte = MiGetPteAddress (Address);
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status = DbgKdReadVirtualMemory((PVOID)Pde,
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&PdeContents,
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sizeof(ULONG),
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&result);
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if ((status != STATUS_SUCCESS) || (result < sizeof(ULONG))) {
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return FALSE;
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}
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if (!(PdeContents & 0x1)) {
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return FALSE;
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}
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status = DbgKdReadVirtualMemory((PVOID)Pte,
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&PteContents,
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sizeof(ULONG),
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&result);
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if ((status != STATUS_SUCCESS) || (result < sizeof(ULONG))) {
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return FALSE;
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}
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if (!(PteContents & 0x1)) {
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if ( (PteContents & MM_PTE_PROTOTYPE_MASK) ||
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!(PteContents & MM_PTE_TRANSITION_MASK)) {
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return FALSE;
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}
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}
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//
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// This is a page which is either present or in transition.
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// Return the physical address for the request virtual address.
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//
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PhysicalAddress->LowPart = ((PteContents >> 9) << 13) | (Address & 0x1FFF);
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PhysicalAddress->HighPart = 0;
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return TRUE;
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}
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