#define NEXT_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \\r
((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) + (Size)))\r
\r
+#define PREVIOUS_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \\r
+ ((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) - (Size)))\r
+\r
+EFI_MEMORY_DESCRIPTOR *mUefiMemoryMap;\r
+UINTN mUefiMemoryMapSize;\r
+UINTN mUefiDescriptorSize;\r
+\r
PAGE_ATTRIBUTE_TABLE mPageAttributeTable[] = {\r
{Page4K, SIZE_4KB, PAGING_4K_ADDRESS_MASK_64},\r
{Page2M, SIZE_2MB, PAGING_2M_ADDRESS_MASK_64},\r
\r
return ;\r
}\r
+\r
+/**\r
+ Sort memory map entries based upon PhysicalStart, from low to high.\r
+\r
+ @param MemoryMap A pointer to the buffer in which firmware places\r
+ the current memory map.\r
+ @param MemoryMapSize Size, in bytes, of the MemoryMap buffer.\r
+ @param DescriptorSize Size, in bytes, of an individual EFI_MEMORY_DESCRIPTOR.\r
+**/\r
+STATIC\r
+VOID\r
+SortMemoryMap (\r
+ IN OUT EFI_MEMORY_DESCRIPTOR *MemoryMap,\r
+ IN UINTN MemoryMapSize,\r
+ IN UINTN DescriptorSize\r
+ )\r
+{\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMapEntry;\r
+ EFI_MEMORY_DESCRIPTOR *NextMemoryMapEntry;\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMapEnd;\r
+ EFI_MEMORY_DESCRIPTOR TempMemoryMap;\r
+\r
+ MemoryMapEntry = MemoryMap;\r
+ NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r
+ MemoryMapEnd = (EFI_MEMORY_DESCRIPTOR *) ((UINT8 *) MemoryMap + MemoryMapSize);\r
+ while (MemoryMapEntry < MemoryMapEnd) {\r
+ while (NextMemoryMapEntry < MemoryMapEnd) {\r
+ if (MemoryMapEntry->PhysicalStart > NextMemoryMapEntry->PhysicalStart) {\r
+ CopyMem (&TempMemoryMap, MemoryMapEntry, sizeof(EFI_MEMORY_DESCRIPTOR));\r
+ CopyMem (MemoryMapEntry, NextMemoryMapEntry, sizeof(EFI_MEMORY_DESCRIPTOR));\r
+ CopyMem (NextMemoryMapEntry, &TempMemoryMap, sizeof(EFI_MEMORY_DESCRIPTOR));\r
+ }\r
+\r
+ NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (NextMemoryMapEntry, DescriptorSize);\r
+ }\r
+\r
+ MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r
+ NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r
+ }\r
+}\r
+\r
+/**\r
+ Return if a UEFI memory page should be marked as not present in SMM page table.\r
+ If the memory map entries type is\r
+ EfiLoaderCode/Data, EfiBootServicesCode/Data, EfiConventionalMemory,\r
+ EfiUnusableMemory, EfiACPIReclaimMemory, return TRUE.\r
+ Or return FALSE.\r
+\r
+ @param[in] MemoryMap A pointer to the memory descriptor.\r
+\r
+ @return TRUE The memory described will be marked as not present in SMM page table.\r
+ @return FALSE The memory described will not be marked as not present in SMM page table.\r
+**/\r
+BOOLEAN\r
+IsUefiPageNotPresent (\r
+ IN EFI_MEMORY_DESCRIPTOR *MemoryMap\r
+ )\r
+{\r
+ switch (MemoryMap->Type) {\r
+ case EfiLoaderCode:\r
+ case EfiLoaderData:\r
+ case EfiBootServicesCode:\r
+ case EfiBootServicesData:\r
+ case EfiConventionalMemory:\r
+ case EfiUnusableMemory:\r
+ case EfiACPIReclaimMemory:\r
+ return TRUE;\r
+ default:\r
+ return FALSE;\r
+ }\r
+}\r
+\r
+/**\r
+ Merge continous memory map entries whose type is\r
+ EfiLoaderCode/Data, EfiBootServicesCode/Data, EfiConventionalMemory,\r
+ EfiUnusableMemory, EfiACPIReclaimMemory, because the memory described by\r
+ these entries will be set as NOT present in SMM page table.\r
+\r
+ @param[in, out] MemoryMap A pointer to the buffer in which firmware places\r
+ the current memory map.\r
+ @param[in, out] MemoryMapSize A pointer to the size, in bytes, of the\r
+ MemoryMap buffer. On input, this is the size of\r
+ the current memory map. On output,\r
+ it is the size of new memory map after merge.\r
+ @param[in] DescriptorSize Size, in bytes, of an individual EFI_MEMORY_DESCRIPTOR.\r
+**/\r
+STATIC\r
+VOID\r
+MergeMemoryMapForNotPresentEntry (\r
+ IN OUT EFI_MEMORY_DESCRIPTOR *MemoryMap,\r
+ IN OUT UINTN *MemoryMapSize,\r
+ IN UINTN DescriptorSize\r
+ )\r
+{\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMapEntry;\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMapEnd;\r
+ UINT64 MemoryBlockLength;\r
+ EFI_MEMORY_DESCRIPTOR *NewMemoryMapEntry;\r
+ EFI_MEMORY_DESCRIPTOR *NextMemoryMapEntry;\r
+\r
+ MemoryMapEntry = MemoryMap;\r
+ NewMemoryMapEntry = MemoryMap;\r
+ MemoryMapEnd = (EFI_MEMORY_DESCRIPTOR *) ((UINT8 *) MemoryMap + *MemoryMapSize);\r
+ while ((UINTN)MemoryMapEntry < (UINTN)MemoryMapEnd) {\r
+ CopyMem (NewMemoryMapEntry, MemoryMapEntry, sizeof(EFI_MEMORY_DESCRIPTOR));\r
+ NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r
+\r
+ do {\r
+ MemoryBlockLength = (UINT64) (EFI_PAGES_TO_SIZE((UINTN)MemoryMapEntry->NumberOfPages));\r
+ if (((UINTN)NextMemoryMapEntry < (UINTN)MemoryMapEnd) &&\r
+ IsUefiPageNotPresent(MemoryMapEntry) && IsUefiPageNotPresent(NextMemoryMapEntry) &&\r
+ ((MemoryMapEntry->PhysicalStart + MemoryBlockLength) == NextMemoryMapEntry->PhysicalStart)) {\r
+ MemoryMapEntry->NumberOfPages += NextMemoryMapEntry->NumberOfPages;\r
+ if (NewMemoryMapEntry != MemoryMapEntry) {\r
+ NewMemoryMapEntry->NumberOfPages += NextMemoryMapEntry->NumberOfPages;\r
+ }\r
+\r
+ NextMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (NextMemoryMapEntry, DescriptorSize);\r
+ continue;\r
+ } else {\r
+ MemoryMapEntry = PREVIOUS_MEMORY_DESCRIPTOR (NextMemoryMapEntry, DescriptorSize);\r
+ break;\r
+ }\r
+ } while (TRUE);\r
+\r
+ MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r
+ NewMemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (NewMemoryMapEntry, DescriptorSize);\r
+ }\r
+\r
+ *MemoryMapSize = (UINTN)NewMemoryMapEntry - (UINTN)MemoryMap;\r
+\r
+ return ;\r
+}\r
+\r
+/**\r
+ This function caches the UEFI memory map information.\r
+**/\r
+VOID\r
+GetUefiMemoryMap (\r
+ VOID\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ UINTN MapKey;\r
+ UINT32 DescriptorVersion;\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMap;\r
+ UINTN UefiMemoryMapSize;\r
+\r
+ DEBUG ((DEBUG_INFO, "GetUefiMemoryMap\n"));\r
+\r
+ UefiMemoryMapSize = 0;\r
+ MemoryMap = NULL;\r
+ Status = gBS->GetMemoryMap (\r
+ &UefiMemoryMapSize,\r
+ MemoryMap,\r
+ &MapKey,\r
+ &mUefiDescriptorSize,\r
+ &DescriptorVersion\r
+ );\r
+ ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r
+\r
+ do {\r
+ Status = gBS->AllocatePool (EfiBootServicesData, UefiMemoryMapSize, (VOID **)&MemoryMap);\r
+ ASSERT (MemoryMap != NULL);\r
+ if (MemoryMap == NULL) {\r
+ return ;\r
+ }\r
+\r
+ Status = gBS->GetMemoryMap (\r
+ &UefiMemoryMapSize,\r
+ MemoryMap,\r
+ &MapKey,\r
+ &mUefiDescriptorSize,\r
+ &DescriptorVersion\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ gBS->FreePool (MemoryMap);\r
+ MemoryMap = NULL;\r
+ }\r
+ } while (Status == EFI_BUFFER_TOO_SMALL);\r
+\r
+ SortMemoryMap (MemoryMap, UefiMemoryMapSize, mUefiDescriptorSize);\r
+ MergeMemoryMapForNotPresentEntry (MemoryMap, &UefiMemoryMapSize, mUefiDescriptorSize);\r
+\r
+ mUefiMemoryMapSize = UefiMemoryMapSize;\r
+ mUefiMemoryMap = AllocateCopyPool (UefiMemoryMapSize, MemoryMap);\r
+ ASSERT (mUefiMemoryMap != NULL);\r
+\r
+ gBS->FreePool (MemoryMap);\r
+}\r
+\r
+/**\r
+ This function sets UEFI memory attribute according to UEFI memory map.\r
+\r
+ The normal memory region is marked as not present, such as\r
+ EfiLoaderCode/Data, EfiBootServicesCode/Data, EfiConventionalMemory,\r
+ EfiUnusableMemory, EfiACPIReclaimMemory.\r
+**/\r
+VOID\r
+SetUefiMemMapAttributes (\r
+ VOID\r
+ )\r
+{\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMap;\r
+ UINTN MemoryMapEntryCount;\r
+ UINTN Index;\r
+\r
+ DEBUG ((DEBUG_INFO, "SetUefiMemMapAttributes\n"));\r
+\r
+ if (mUefiMemoryMap == NULL) {\r
+ DEBUG ((DEBUG_INFO, "UefiMemoryMap - NULL\n"));\r
+ return ;\r
+ }\r
+\r
+ MemoryMapEntryCount = mUefiMemoryMapSize/mUefiDescriptorSize;\r
+ MemoryMap = mUefiMemoryMap;\r
+ for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r
+ if (IsUefiPageNotPresent(MemoryMap)) {\r
+ DEBUG ((DEBUG_INFO, "UefiMemory protection: 0x%lx - 0x%lx\n", MemoryMap->PhysicalStart, MemoryMap->PhysicalStart + (UINT64)EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages)));\r
+ SmmSetMemoryAttributes (\r
+ MemoryMap->PhysicalStart,\r
+ EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ EFI_MEMORY_RP\r
+ );\r
+ }\r
+ MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
+ }\r
+\r
+ //\r
+ // Do free mUefiMemoryMap, it will be checked in IsSmmCommBufferForbiddenAddress().\r
+ //\r
+}\r
+\r
+/**\r
+ Return if the Address is forbidden as SMM communication buffer.\r
+\r
+ @param[in] Address the address to be checked\r
+\r
+ @return TRUE The address is forbidden as SMM communication buffer.\r
+ @return FALSE The address is allowed as SMM communication buffer.\r
+**/\r
+BOOLEAN\r
+IsSmmCommBufferForbiddenAddress (\r
+ IN UINT64 Address\r
+ )\r
+{\r
+ EFI_MEMORY_DESCRIPTOR *MemoryMap;\r
+ UINTN MemoryMapEntryCount;\r
+ UINTN Index;\r
+\r
+ MemoryMap = mUefiMemoryMap;\r
+ MemoryMapEntryCount = mUefiMemoryMapSize/mUefiDescriptorSize;\r
+ for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r
+ if (IsUefiPageNotPresent (MemoryMap)) {\r
+ if ((Address >= MemoryMap->PhysicalStart) &&\r
+ (Address < MemoryMap->PhysicalStart + EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages)) ) {\r
+ return TRUE;\r
+ }\r
+ }\r
+ MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
+ }\r
+ return FALSE;\r
+}\r
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