/** @file\r
\r
-Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
\r
#include "PiSmmCpuDxeSmm.h"\r
\r
-#define NEXT_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \\r
- ((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) + (Size)))\r
+//\r
+// attributes for reserved memory before it is promoted to system memory\r
+//\r
+#define EFI_MEMORY_PRESENT 0x0100000000000000ULL\r
+#define EFI_MEMORY_INITIALIZED 0x0200000000000000ULL\r
+#define EFI_MEMORY_TESTED 0x0400000000000000ULL\r
\r
#define PREVIOUS_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \\r
((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) - (Size)))\r
UINTN mUefiMemoryMapSize;\r
UINTN mUefiDescriptorSize;\r
\r
+EFI_GCD_MEMORY_SPACE_DESCRIPTOR *mGcdMemSpace = NULL;\r
+UINTN mGcdMemNumberOfDesc = 0;\r
+\r
+EFI_MEMORY_ATTRIBUTES_TABLE *mUefiMemoryAttributesTable = NULL;\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
{Page1G, SIZE_1GB, PAGING_1G_ADDRESS_MASK_64},\r
};\r
\r
+UINTN mInternalGr3;\r
+\r
+/**\r
+ Set the internal page table base address.\r
+ If it is non zero, further MemoryAttribute modification will be on this page table.\r
+ If it is zero, further MemoryAttribute modification will be on real page table.\r
+\r
+ @param Cr3 page table base.\r
+**/\r
+VOID\r
+SetPageTableBase (\r
+ IN UINTN Cr3\r
+ )\r
+{\r
+ mInternalGr3 = Cr3;\r
+}\r
+\r
/**\r
Return page table base.\r
\r
VOID\r
)\r
{\r
+ if (mInternalGr3 != 0) {\r
+ return mInternalGr3;\r
+ }\r
return (AsmReadCr3 () & PAGING_4K_ADDRESS_MASK_64);\r
}\r
\r
if ((Attributes & EFI_MEMORY_RO) != 0) {\r
if (IsSet) {\r
NewPageEntry &= ~(UINT64)IA32_PG_RW;\r
+ if (mInternalGr3 != 0) {\r
+ // Environment setup\r
+ // ReadOnly page need set Dirty bit for shadow stack\r
+ NewPageEntry |= IA32_PG_D;\r
+ // Clear user bit for supervisor shadow stack\r
+ NewPageEntry &= ~(UINT64)IA32_PG_U;\r
+ } else {\r
+ // Runtime update\r
+ // Clear dirty bit for non shadow stack, to protect RO page.\r
+ NewPageEntry &= ~(UINT64)IA32_PG_D;\r
+ }\r
} else {\r
NewPageEntry |= IA32_PG_RW;\r
}\r
BaseAddress and Length cannot be modified.\r
@retval EFI_INVALID_PARAMETER Length is zero.\r
Attributes specified an illegal combination of attributes that\r
- cannot be set together.\r
+ cannot be cleared together.\r
@retval EFI_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of\r
the memory resource range.\r
@retval EFI_UNSUPPORTED The processor does not support one or more bytes of the memory\r
resource range specified by BaseAddress and Length.\r
- The bit mask of attributes is not support for the memory resource\r
+ The bit mask of attributes is not supported for the memory resource\r
range specified by BaseAddress and Length.\r
\r
**/\r
the memory resource range.\r
@retval EFI_UNSUPPORTED The processor does not support one or more bytes of the memory\r
resource range specified by BaseAddress and Length.\r
- The bit mask of attributes is not support for the memory resource\r
+ The bit mask of attributes is not supported for the memory resource\r
range specified by BaseAddress and Length.\r
\r
**/\r
BaseAddress and Length cannot be modified.\r
@retval EFI_INVALID_PARAMETER Length is zero.\r
Attributes specified an illegal combination of attributes that\r
- cannot be set together.\r
+ cannot be cleared together.\r
@retval EFI_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of\r
the memory resource range.\r
@retval EFI_UNSUPPORTED The processor does not support one or more bytes of the memory\r
resource range specified by BaseAddress and Length.\r
- The bit mask of attributes is not support for the memory resource\r
+ The bit mask of attributes is not supported for the memory resource\r
range specified by BaseAddress and Length.\r
\r
**/\r
return SmmClearMemoryAttributesEx (BaseAddress, Length, Attributes, NULL);\r
}\r
\r
+/**\r
+ Set ShadowStack memory.\r
+\r
+ @param[in] Cr3 The page table base address.\r
+ @param[in] BaseAddress The physical address that is the start address of a memory region.\r
+ @param[in] Length The size in bytes of the memory region.\r
+\r
+ @retval EFI_SUCCESS The shadow stack memory is set.\r
+**/\r
+EFI_STATUS\r
+SetShadowStack (\r
+ IN UINTN Cr3,\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+\r
+ SetPageTableBase (Cr3);\r
+\r
+ Status = SmmSetMemoryAttributes (BaseAddress, Length, EFI_MEMORY_RO);\r
\r
+ SetPageTableBase (0);\r
+\r
+ return Status;\r
+}\r
+\r
+/**\r
+ Set not present memory.\r
+\r
+ @param[in] Cr3 The page table base address.\r
+ @param[in] BaseAddress The physical address that is the start address of a memory region.\r
+ @param[in] Length The size in bytes of the memory region.\r
+\r
+ @retval EFI_SUCCESS The not present memory is set.\r
+**/\r
+EFI_STATUS\r
+SetNotPresentPage (\r
+ IN UINTN Cr3,\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+\r
+ SetPageTableBase (Cr3);\r
+\r
+ Status = SmmSetMemoryAttributes (BaseAddress, Length, EFI_MEMORY_RP);\r
+\r
+ SetPageTableBase (0);\r
+\r
+ return Status;\r
+}\r
\r
/**\r
Retrieves a pointer to the system configuration table from the SMM System Table\r
);\r
}\r
\r
+/**\r
+ This function sets GDT/IDT buffer to be RO and XP.\r
+**/\r
+VOID\r
+PatchGdtIdtMap (\r
+ VOID\r
+ )\r
+{\r
+ EFI_PHYSICAL_ADDRESS BaseAddress;\r
+ UINTN Size;\r
+\r
+ //\r
+ // GDT\r
+ //\r
+ DEBUG ((DEBUG_INFO, "PatchGdtIdtMap - GDT:\n"));\r
+\r
+ BaseAddress = mGdtBuffer;\r
+ Size = ALIGN_VALUE(mGdtBufferSize, SIZE_4KB);\r
+ //\r
+ // The range should have been set to RO\r
+ // if it is allocated with EfiRuntimeServicesCode.\r
+ //\r
+ SmmSetMemoryAttributes (\r
+ BaseAddress,\r
+ Size,\r
+ EFI_MEMORY_XP\r
+ );\r
+\r
+ //\r
+ // IDT\r
+ //\r
+ DEBUG ((DEBUG_INFO, "PatchGdtIdtMap - IDT:\n"));\r
+\r
+ BaseAddress = gcSmiIdtr.Base;\r
+ Size = ALIGN_VALUE(gcSmiIdtr.Limit + 1, SIZE_4KB);\r
+ //\r
+ // The range should have been set to RO\r
+ // if it is allocated with EfiRuntimeServicesCode.\r
+ //\r
+ SmmSetMemoryAttributes (\r
+ BaseAddress,\r
+ Size,\r
+ EFI_MEMORY_XP\r
+ );\r
+}\r
+\r
/**\r
This function sets memory attribute according to MemoryAttributesTable.\r
**/\r
return ;\r
}\r
\r
+/**\r
+ This function caches the GCD memory map information.\r
+**/\r
+VOID\r
+GetGcdMemoryMap (\r
+ VOID\r
+ )\r
+{\r
+ UINTN NumberOfDescriptors;\r
+ EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemSpaceMap;\r
+ EFI_STATUS Status;\r
+ UINTN Index;\r
+\r
+ Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemSpaceMap);\r
+ if (EFI_ERROR (Status)) {\r
+ return ;\r
+ }\r
+\r
+ mGcdMemNumberOfDesc = 0;\r
+ for (Index = 0; Index < NumberOfDescriptors; Index++) {\r
+ if (MemSpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeReserved &&\r
+ (MemSpaceMap[Index].Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) ==\r
+ (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED)\r
+ ) {\r
+ mGcdMemNumberOfDesc++;\r
+ }\r
+ }\r
+\r
+ mGcdMemSpace = AllocateZeroPool (mGcdMemNumberOfDesc * sizeof (EFI_GCD_MEMORY_SPACE_DESCRIPTOR));\r
+ ASSERT (mGcdMemSpace != NULL);\r
+ if (mGcdMemSpace == NULL) {\r
+ mGcdMemNumberOfDesc = 0;\r
+ gBS->FreePool (MemSpaceMap);\r
+ return ;\r
+ }\r
+\r
+ mGcdMemNumberOfDesc = 0;\r
+ for (Index = 0; Index < NumberOfDescriptors; Index++) {\r
+ if (MemSpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeReserved &&\r
+ (MemSpaceMap[Index].Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) ==\r
+ (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED)\r
+ ) {\r
+ CopyMem (\r
+ &mGcdMemSpace[mGcdMemNumberOfDesc],\r
+ &MemSpaceMap[Index],\r
+ sizeof(EFI_GCD_MEMORY_SPACE_DESCRIPTOR)\r
+ );\r
+ mGcdMemNumberOfDesc++;\r
+ }\r
+ }\r
+\r
+ gBS->FreePool (MemSpaceMap);\r
+}\r
+\r
+/**\r
+ Get UEFI MemoryAttributesTable.\r
+**/\r
+VOID\r
+GetUefiMemoryAttributesTable (\r
+ VOID\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_MEMORY_ATTRIBUTES_TABLE *MemoryAttributesTable;\r
+ UINTN MemoryAttributesTableSize;\r
+\r
+ Status = EfiGetSystemConfigurationTable (&gEfiMemoryAttributesTableGuid, (VOID **)&MemoryAttributesTable);\r
+ if (!EFI_ERROR (Status) && (MemoryAttributesTable != NULL)) {\r
+ MemoryAttributesTableSize = sizeof(EFI_MEMORY_ATTRIBUTES_TABLE) + MemoryAttributesTable->DescriptorSize * MemoryAttributesTable->NumberOfEntries;\r
+ mUefiMemoryAttributesTable = AllocateCopyPool (MemoryAttributesTableSize, MemoryAttributesTable);\r
+ ASSERT (mUefiMemoryAttributesTable != NULL);\r
+ }\r
+}\r
+\r
/**\r
This function caches the UEFI memory map information.\r
**/\r
ASSERT (mUefiMemoryMap != NULL);\r
\r
gBS->FreePool (MemoryMap);\r
+\r
+ //\r
+ // Get additional information from GCD memory map.\r
+ //\r
+ GetGcdMemoryMap ();\r
+\r
+ //\r
+ // Get UEFI memory attributes table.\r
+ //\r
+ GetUefiMemoryAttributesTable ();\r
}\r
\r
/**\r
EFI_MEMORY_DESCRIPTOR *MemoryMap;\r
UINTN MemoryMapEntryCount;\r
UINTN Index;\r
+ EFI_MEMORY_DESCRIPTOR *Entry;\r
\r
DEBUG ((DEBUG_INFO, "SetUefiMemMapAttributes\n"));\r
\r
- if (mUefiMemoryMap == NULL) {\r
- DEBUG ((DEBUG_INFO, "UefiMemoryMap - NULL\n"));\r
- return ;\r
+ if (mUefiMemoryMap != NULL) {\r
+ MemoryMapEntryCount = mUefiMemoryMapSize/mUefiDescriptorSize;\r
+ MemoryMap = mUefiMemoryMap;\r
+ for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r
+ if (IsUefiPageNotPresent(MemoryMap)) {\r
+ Status = SmmSetMemoryAttributes (\r
+ MemoryMap->PhysicalStart,\r
+ EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ EFI_MEMORY_RP\r
+ );\r
+ DEBUG ((\r
+ DEBUG_INFO,\r
+ "UefiMemory protection: 0x%lx - 0x%lx %r\n",\r
+ MemoryMap->PhysicalStart,\r
+ MemoryMap->PhysicalStart + (UINT64)EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ Status\r
+ ));\r
+ }\r
+ MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
+ }\r
}\r
+ //\r
+ // Do not free mUefiMemoryMap, it will be checked in IsSmmCommBufferForbiddenAddress().\r
+ //\r
\r
- MemoryMapEntryCount = mUefiMemoryMapSize/mUefiDescriptorSize;\r
- MemoryMap = mUefiMemoryMap;\r
- for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r
- if (IsUefiPageNotPresent(MemoryMap)) {\r
+ //\r
+ // Set untested memory as not present.\r
+ //\r
+ if (mGcdMemSpace != NULL) {\r
+ for (Index = 0; Index < mGcdMemNumberOfDesc; Index++) {\r
Status = SmmSetMemoryAttributes (\r
- MemoryMap->PhysicalStart,\r
- EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ mGcdMemSpace[Index].BaseAddress,\r
+ mGcdMemSpace[Index].Length,\r
EFI_MEMORY_RP\r
);\r
DEBUG ((\r
DEBUG_INFO,\r
- "UefiMemory protection: 0x%lx - 0x%lx %r\n",\r
- MemoryMap->PhysicalStart,\r
- MemoryMap->PhysicalStart + (UINT64)EFI_PAGES_TO_SIZE((UINTN)MemoryMap->NumberOfPages),\r
+ "GcdMemory protection: 0x%lx - 0x%lx %r\n",\r
+ mGcdMemSpace[Index].BaseAddress,\r
+ mGcdMemSpace[Index].BaseAddress + mGcdMemSpace[Index].Length,\r
Status\r
));\r
}\r
- MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
}\r
+ //\r
+ // Do not free mGcdMemSpace, it will be checked in IsSmmCommBufferForbiddenAddress().\r
+ //\r
\r
//\r
- // Do free mUefiMemoryMap, it will be checked in IsSmmCommBufferForbiddenAddress().\r
+ // Set UEFI runtime memory with EFI_MEMORY_RO as not present.\r
+ //\r
+ if (mUefiMemoryAttributesTable != NULL) {\r
+ Entry = (EFI_MEMORY_DESCRIPTOR *)(mUefiMemoryAttributesTable + 1);\r
+ for (Index = 0; Index < mUefiMemoryAttributesTable->NumberOfEntries; Index++) {\r
+ if (Entry->Type == EfiRuntimeServicesCode || Entry->Type == EfiRuntimeServicesData) {\r
+ if ((Entry->Attribute & EFI_MEMORY_RO) != 0) {\r
+ Status = SmmSetMemoryAttributes (\r
+ Entry->PhysicalStart,\r
+ EFI_PAGES_TO_SIZE((UINTN)Entry->NumberOfPages),\r
+ EFI_MEMORY_RP\r
+ );\r
+ DEBUG ((\r
+ DEBUG_INFO,\r
+ "UefiMemoryAttribute protection: 0x%lx - 0x%lx %r\n",\r
+ Entry->PhysicalStart,\r
+ Entry->PhysicalStart + (UINT64)EFI_PAGES_TO_SIZE((UINTN)Entry->NumberOfPages),\r
+ Status\r
+ ));\r
+ }\r
+ }\r
+ Entry = NEXT_MEMORY_DESCRIPTOR (Entry, mUefiMemoryAttributesTable->DescriptorSize);\r
+ }\r
+ }\r
+ //\r
+ // Do not free mUefiMemoryAttributesTable, it will be checked in IsSmmCommBufferForbiddenAddress().\r
//\r
}\r
\r
EFI_MEMORY_DESCRIPTOR *MemoryMap;\r
UINTN MemoryMapEntryCount;\r
UINTN Index;\r
-\r
- if (mUefiMemoryMap == NULL) {\r
- return FALSE;\r
+ EFI_MEMORY_DESCRIPTOR *Entry;\r
+\r
+ if (mUefiMemoryMap != NULL) {\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
}\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
+ if (mGcdMemSpace != NULL) {\r
+ for (Index = 0; Index < mGcdMemNumberOfDesc; Index++) {\r
+ if ((Address >= mGcdMemSpace[Index].BaseAddress) &&\r
+ (Address < mGcdMemSpace[Index].BaseAddress + mGcdMemSpace[Index].Length) ) {\r
return TRUE;\r
}\r
}\r
- MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mUefiDescriptorSize);\r
+ }\r
+\r
+ if (mUefiMemoryAttributesTable != NULL) {\r
+ Entry = (EFI_MEMORY_DESCRIPTOR *)(mUefiMemoryAttributesTable + 1);\r
+ for (Index = 0; Index < mUefiMemoryAttributesTable->NumberOfEntries; Index++) {\r
+ if (Entry->Type == EfiRuntimeServicesCode || Entry->Type == EfiRuntimeServicesData) {\r
+ if ((Entry->Attribute & EFI_MEMORY_RO) != 0) {\r
+ if ((Address >= Entry->PhysicalStart) &&\r
+ (Address < Entry->PhysicalStart + LShiftU64 (Entry->NumberOfPages, EFI_PAGE_SHIFT))) {\r
+ return TRUE;\r
+ }\r
+ Entry = NEXT_MEMORY_DESCRIPTOR (Entry, mUefiMemoryAttributesTable->DescriptorSize);\r
+ }\r
+ }\r
+ }\r
}\r
return FALSE;\r
}\r
+\r
+/**\r
+ This function set given attributes of the memory region specified by\r
+ BaseAddress and Length.\r
+\r
+ @param This The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.\r
+ @param BaseAddress The physical address that is the start address of\r
+ a memory region.\r
+ @param Length The size in bytes of the memory region.\r
+ @param Attributes The bit mask of attributes to set for the memory\r
+ region.\r
+\r
+ @retval EFI_SUCCESS The attributes were set for the memory region.\r
+ @retval EFI_INVALID_PARAMETER Length is zero.\r
+ Attributes specified an illegal combination of\r
+ attributes that cannot be set together.\r
+ @retval EFI_UNSUPPORTED The processor does not support one or more\r
+ bytes of the memory resource range specified\r
+ by BaseAddress and Length.\r
+ The bit mask of attributes is not supported for\r
+ the memory resource range specified by\r
+ BaseAddress and Length.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+EdkiiSmmSetMemoryAttributes (\r
+ IN EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length,\r
+ IN UINT64 Attributes\r
+ )\r
+{\r
+ return SmmSetMemoryAttributes (BaseAddress, Length, Attributes);\r
+}\r
+\r
+/**\r
+ This function clears given attributes of the memory region specified by\r
+ BaseAddress and Length.\r
+\r
+ @param This The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.\r
+ @param BaseAddress The physical address that is the start address of\r
+ a memory region.\r
+ @param Length The size in bytes of the memory region.\r
+ @param Attributes The bit mask of attributes to clear for the memory\r
+ region.\r
+\r
+ @retval EFI_SUCCESS The attributes were cleared for the memory region.\r
+ @retval EFI_INVALID_PARAMETER Length is zero.\r
+ Attributes specified an illegal combination of\r
+ attributes that cannot be cleared together.\r
+ @retval EFI_UNSUPPORTED The processor does not support one or more\r
+ bytes of the memory resource range specified\r
+ by BaseAddress and Length.\r
+ The bit mask of attributes is not supported for\r
+ the memory resource range specified by\r
+ BaseAddress and Length.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+EdkiiSmmClearMemoryAttributes (\r
+ IN EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length,\r
+ IN UINT64 Attributes\r
+ )\r
+{\r
+ return SmmClearMemoryAttributes (BaseAddress, Length, Attributes);\r
+}\r
+\r
+/**\r
+ This function retrieves the attributes of the memory region specified by\r
+ BaseAddress and Length. If different attributes are got from different part\r
+ of the memory region, EFI_NO_MAPPING will be returned.\r
+\r
+ @param This The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.\r
+ @param BaseAddress The physical address that is the start address of\r
+ a memory region.\r
+ @param Length The size in bytes of the memory region.\r
+ @param Attributes Pointer to attributes returned.\r
+\r
+ @retval EFI_SUCCESS The attributes got for the memory region.\r
+ @retval EFI_INVALID_PARAMETER Length is zero.\r
+ Attributes is NULL.\r
+ @retval EFI_NO_MAPPING Attributes are not consistent cross the memory\r
+ region.\r
+ @retval EFI_UNSUPPORTED The processor does not support one or more\r
+ bytes of the memory resource range specified\r
+ by BaseAddress and Length.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+EdkiiSmmGetMemoryAttributes (\r
+ IN EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length,\r
+ OUT UINT64 *Attributes\r
+ )\r
+{\r
+ EFI_PHYSICAL_ADDRESS Address;\r
+ UINT64 *PageEntry;\r
+ UINT64 MemAttr;\r
+ PAGE_ATTRIBUTE PageAttr;\r
+ INT64 Size;\r
+\r
+ if (Length < SIZE_4KB || Attributes == NULL) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ Size = (INT64)Length;\r
+ MemAttr = (UINT64)-1;\r
+\r
+ do {\r
+\r
+ PageEntry = GetPageTableEntry (BaseAddress, &PageAttr);\r
+ if (PageEntry == NULL || PageAttr == PageNone) {\r
+ return EFI_UNSUPPORTED;\r
+ }\r
+\r
+ //\r
+ // If the memory range is cross page table boundary, make sure they\r
+ // share the same attribute. Return EFI_NO_MAPPING if not.\r
+ //\r
+ *Attributes = GetAttributesFromPageEntry (PageEntry);\r
+ if (MemAttr != (UINT64)-1 && *Attributes != MemAttr) {\r
+ return EFI_NO_MAPPING;\r
+ }\r
+\r
+ switch (PageAttr) {\r
+ case Page4K:\r
+ Address = *PageEntry & ~mAddressEncMask & PAGING_4K_ADDRESS_MASK_64;\r
+ Size -= (SIZE_4KB - (BaseAddress - Address));\r
+ BaseAddress += (SIZE_4KB - (BaseAddress - Address));\r
+ break;\r
+\r
+ case Page2M:\r
+ Address = *PageEntry & ~mAddressEncMask & PAGING_2M_ADDRESS_MASK_64;\r
+ Size -= SIZE_2MB - (BaseAddress - Address);\r
+ BaseAddress += SIZE_2MB - (BaseAddress - Address);\r
+ break;\r
+\r
+ case Page1G:\r
+ Address = *PageEntry & ~mAddressEncMask & PAGING_1G_ADDRESS_MASK_64;\r
+ Size -= SIZE_1GB - (BaseAddress - Address);\r
+ BaseAddress += SIZE_1GB - (BaseAddress - Address);\r
+ break;\r
+\r
+ default:\r
+ return EFI_UNSUPPORTED;\r
+ }\r
+\r
+ MemAttr = *Attributes;\r
+\r
+ } while (Size > 0);\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
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