315 lines
7 KiB
C
315 lines
7 KiB
C
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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xxmemory.c
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Abstract:
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Provides routines to allow the HAL to map physical memory.
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Author:
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John Vert (jvert) 3-Sep-1991
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Environment:
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Phase 0 initialization only.
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Revision History:
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--*/
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#include "halp.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(INIT,HalpAllocPhysicalMemory)
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#endif
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MEMORY_ALLOCATION_DESCRIPTOR HalpExtraAllocationDescriptor;
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PVOID
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HalpMapPhysicalMemory(
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IN PHYSICAL_ADDRESS PhysicalAddress,
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IN ULONG NumberPages,
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IN MEMORY_CACHING_TYPE CacheType
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)
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/*++
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Routine Description:
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This routine maps physical memory into the area of virtual memory
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reserved for the HAL.
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Arguments:
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PhysicalAddress - Supplies the physical address of the start of the
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area of physical memory to be mapped.
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NumberPages - This is not used for IA64. It is here just to keep the
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interface consistent.
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Return Value:
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PVOID - Virtual address at which the requested block of physical memory
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was mapped
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NULL - The requested block of physical memory could not be mapped.
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--*/
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{
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if (CacheType == MmCached) {
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return (PVOID)(((ULONG_PTR)KSEG_ADDRESS(PhysicalAddress.QuadPart >> PAGE_SHIFT)) |
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(PhysicalAddress.QuadPart & ~(-1 << PAGE_SHIFT)));
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} else {
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return (PVOID)(((ULONG_PTR)KSEG4_ADDRESS(PhysicalAddress.QuadPart >> PAGE_SHIFT)) |
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(PhysicalAddress.QuadPart & ~(-1 << PAGE_SHIFT)));
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}
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}
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PVOID
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HalpMapPhysicalMemory64(
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IN PHYSICAL_ADDRESS PhysicalAddress,
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IN ULONG NumberPages
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)
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/*++
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Routine Description:
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Maps a physical memory address into virtual space by calling HalpMapPhysicalMemory but
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always in the MmNonCached mode. MMIO.
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Arguments:
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PhysicalAddress - Supplies a physical address of the memory to be mapped
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NumberPages - Number of pages to map
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Return Value:
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Virtual address pointer to the requested physical address
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--*/
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{
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return HalpMapPhysicalMemory(PhysicalAddress, NumberPages, MmNonCached);
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} // HalpMapPhysicalMemory64()
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VOID
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HalpUnmapVirtualAddress(
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IN PVOID VirtualAddress,
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IN ULONG NumberPages
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)
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/*++
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Routine Description:
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Release PTEs previously allocated to map memory by
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HalpMapPhysicalMemory.
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Note: This routine does not free memory, it only releases
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the Virtual to Physical translation.
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Arguments:
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VirtualAddress Supplied the base VA of the address range to be
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released.
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NumberPages Supplied the length of the range.
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Return Value.
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None.
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--*/
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{
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//
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// HalpMapPhysicalMemory returns an address in KSEG4 and it doesn't use a
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// page table, so no need to unmap.
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//
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// MmUnmapIoSpace(VirtualAddress, PAGE_SIZE * NumberPages);
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return;
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}
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PVOID
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HalpAllocPhysicalMemory(
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IN PLOADER_PARAMETER_BLOCK LoaderBlock,
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IN ULONG_PTR MaxPhysicalAddress,
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IN ULONG NoPages,
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IN BOOLEAN bAlignOn64k
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)
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/*++
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Routine Description:
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Carves out N pages of physical memory from the memory descriptor
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list in the desired location. This function is to be called only
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during phase zero initialization. (ie, before the kernel's memory
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management system is running)
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Arguments:
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MaxPhysicalAddress - The max address where the physical memory can be
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NoPages - Number of pages to allocate
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Return Value:
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The physical address or NULL if the memory could not be obtained.
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--*/
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{
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PMEMORY_ALLOCATION_DESCRIPTOR Descriptor;
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PLIST_ENTRY NextMd;
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ULONG AlignmentOffset;
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ULONG_PTR MaxPageAddress;
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ULONG_PTR PhysicalAddress;
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MaxPageAddress = MaxPhysicalAddress >> PAGE_SHIFT;
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//
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// Scan the memory allocation descriptors and allocate map buffers
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//
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NextMd = LoaderBlock->MemoryDescriptorListHead.Flink;
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while (NextMd != &LoaderBlock->MemoryDescriptorListHead) {
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Descriptor = CONTAINING_RECORD(
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NextMd,
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MEMORY_ALLOCATION_DESCRIPTOR,
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ListEntry
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);
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AlignmentOffset = bAlignOn64k ?
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((Descriptor->BasePage + 0x0f) & ~0x0f) - Descriptor->BasePage :
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0;
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//
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// Search for a block of memory which is contains a memory chuck
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// that is greater than size pages, and has a physical address less
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// than MAXIMUM_PHYSICAL_ADDRESS.
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//
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if ((Descriptor->MemoryType == LoaderFree ||
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Descriptor->MemoryType == MemoryFirmwareTemporary) &&
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(Descriptor->BasePage) &&
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(Descriptor->PageCount >= NoPages + AlignmentOffset) &&
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(Descriptor->BasePage + NoPages + AlignmentOffset < MaxPageAddress)) {
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PhysicalAddress =
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(Descriptor->BasePage + AlignmentOffset) << PAGE_SHIFT;
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break;
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}
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NextMd = NextMd->Flink;
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}
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//
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// Use the extra descriptor to define the memory at the end of the
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// original block.
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//
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ASSERT(NextMd != &LoaderBlock->MemoryDescriptorListHead);
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if (NextMd == &LoaderBlock->MemoryDescriptorListHead)
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return 0;
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//
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// Adjust the memory descriptors.
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//
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if (AlignmentOffset == 0) {
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Descriptor->BasePage += NoPages;
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Descriptor->PageCount -= NoPages;
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if (Descriptor->PageCount == 0) {
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//
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// The whole block was allocated,
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// Remove the entry from the list completely.
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//
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RemoveEntryList(&Descriptor->ListEntry);
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}
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} else {
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if (Descriptor->PageCount - NoPages - AlignmentOffset) {
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//
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// Currently we only allow one Align64K allocation
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//
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ASSERT (HalpExtraAllocationDescriptor.PageCount == 0);
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//
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// The extra descriptor is needed so intialize it and insert
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// it in the list.
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//
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HalpExtraAllocationDescriptor.PageCount =
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Descriptor->PageCount - NoPages - AlignmentOffset;
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HalpExtraAllocationDescriptor.BasePage =
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Descriptor->BasePage + NoPages + AlignmentOffset;
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HalpExtraAllocationDescriptor.MemoryType = MemoryFree;
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InsertHeadList(
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&Descriptor->ListEntry,
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&HalpExtraAllocationDescriptor.ListEntry
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);
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}
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//
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// Use the current entry as the descriptor for the first block.
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//
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Descriptor->PageCount = AlignmentOffset;
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}
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return (PVOID)PhysicalAddress;
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}
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BOOLEAN
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HalpVirtualToPhysical(
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IN ULONG_PTR VirtualAddress,
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OUT PPHYSICAL_ADDRESS PhysicalAddress
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)
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{
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if (VirtualAddress >= KSEG3_BASE && VirtualAddress < KSEG3_LIMIT) {
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PhysicalAddress->QuadPart = VirtualAddress - KSEG3_BASE;
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} else if (VirtualAddress >= KSEG4_BASE && VirtualAddress < KSEG4_LIMIT) {
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PhysicalAddress->QuadPart = VirtualAddress - KSEG4_BASE;
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} else {
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return FALSE;
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}
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return TRUE;
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}
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