Truncate memory descriptor to 4GB only with PML2
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763bade115
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@ -325,11 +325,23 @@ BlMapEfiMemory(IN OUT PXTBL_PAGE_MAPPING PageMap,
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continue;
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}
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/* Check if memory descriptor exceeds the lowest physical page */
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if(Descriptor->PhysicalStart + (Descriptor->NumberOfPages << EFI_PAGE_SHIFT) > MAXUINT_PTR)
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/* Check if preparing page map level 2 (non-PAE i686) */
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if(PageMap->PageMapLevel == 2)
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{
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/* Truncate memory descriptor to the 4GB */
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Descriptor->NumberOfPages = ((MAXUINT_PTR + 1) - Descriptor->PhysicalStart) >> EFI_PAGE_SHIFT;
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/* Check if physical address starts beyond 4GB */
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if(Descriptor->PhysicalStart > 0xFFFFFFFF)
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{
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/* Go to the next descriptor */
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Descriptor = (PEFI_MEMORY_DESCRIPTOR)((PUCHAR)Descriptor + MemoryMap->DescriptorSize);
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continue;
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}
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/* Check if memory descriptor exceeds the lowest physical page */
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if(Descriptor->PhysicalStart + (Descriptor->NumberOfPages << EFI_PAGE_SHIFT) > MAXULONG)
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{
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/* Truncate memory descriptor to the 4GB */
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Descriptor->NumberOfPages = (((ULONGLONG)MAXULONG + 1) - Descriptor->PhysicalStart) >> EFI_PAGE_SHIFT;
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}
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}
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/* Convert EFI memory type into XTLDR memory type */
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