#include <Uefi.h>\r
#include <Chipset/ArmV7.h>\r
#include <Library/BaseMemoryLib.h>\r
+#include <Library/CacheMaintenanceLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
#include <Library/ArmLib.h>\r
#include <Library/BaseLib.h>\r
#define ID_MMFR0_SHR_IMP_HW_COHERENT 1\r
#define ID_MMFR0_SHR_IGNORED 0xf\r
\r
+#define CACHE_ATTRIBUTE_MASK (EFI_MEMORY_UC | \\r
+ EFI_MEMORY_WC | \\r
+ EFI_MEMORY_WT | \\r
+ EFI_MEMORY_WB | \\r
+ EFI_MEMORY_UCE | \\r
+ EFI_MEMORY_WP)\r
+\r
UINTN\r
EFIAPI\r
ArmReadIdMmfr0 (\r
return RETURN_SUCCESS;\r
}\r
\r
+STATIC\r
+EFI_STATUS\r
+ConvertSectionToPages (\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress\r
+ )\r
+{\r
+ UINT32 FirstLevelIdx;\r
+ UINT32 SectionDescriptor;\r
+ UINT32 PageTableDescriptor;\r
+ UINT32 PageDescriptor;\r
+ UINT32 Index;\r
+\r
+ volatile ARM_FIRST_LEVEL_DESCRIPTOR *FirstLevelTable;\r
+ volatile ARM_PAGE_TABLE_ENTRY *PageTable;\r
+\r
+ DEBUG ((EFI_D_PAGE, "Converting section at 0x%x to pages\n", (UINTN)BaseAddress));\r
+\r
+ // Obtain page table base\r
+ FirstLevelTable = (ARM_FIRST_LEVEL_DESCRIPTOR *)ArmGetTTBR0BaseAddress ();\r
+\r
+ // Calculate index into first level translation table for start of modification\r
+ FirstLevelIdx = TT_DESCRIPTOR_SECTION_BASE_ADDRESS(BaseAddress) >> TT_DESCRIPTOR_SECTION_BASE_SHIFT;\r
+ ASSERT (FirstLevelIdx < TRANSLATION_TABLE_SECTION_COUNT);\r
+\r
+ // Get section attributes and convert to page attributes\r
+ SectionDescriptor = FirstLevelTable[FirstLevelIdx];\r
+ PageDescriptor = TT_DESCRIPTOR_PAGE_TYPE_PAGE | ConvertSectionAttributesToPageAttributes (SectionDescriptor, FALSE);\r
+\r
+ // Allocate a page table for the 4KB entries (we use up a full page even though we only need 1KB)\r
+ PageTable = (volatile ARM_PAGE_TABLE_ENTRY *)AllocatePages (1);\r
+ if (PageTable == NULL) {\r
+ return EFI_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ // Write the page table entries out\r
+ for (Index = 0; Index < TRANSLATION_TABLE_PAGE_COUNT; Index++) {\r
+ PageTable[Index] = TT_DESCRIPTOR_PAGE_BASE_ADDRESS(BaseAddress + (Index << 12)) | PageDescriptor;\r
+ }\r
+\r
+ // Flush d-cache so descriptors make it back to uncached memory for subsequent table walks\r
+ WriteBackInvalidateDataCacheRange ((VOID *)PageTable, TT_DESCRIPTOR_PAGE_SIZE);\r
+\r
+ // Formulate page table entry, Domain=0, NS=0\r
+ PageTableDescriptor = (((UINTN)PageTable) & TT_DESCRIPTOR_SECTION_PAGETABLE_ADDRESS_MASK) | TT_DESCRIPTOR_SECTION_TYPE_PAGE_TABLE;\r
+\r
+ // Write the page table entry out, replacing section entry\r
+ FirstLevelTable[FirstLevelIdx] = PageTableDescriptor;\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+STATIC\r
+EFI_STATUS\r
+UpdatePageEntries (\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length,\r
+ IN UINT64 Attributes,\r
+ IN EFI_PHYSICAL_ADDRESS VirtualMask,\r
+ OUT BOOLEAN *FlushTlbs OPTIONAL\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ UINT32 EntryValue;\r
+ UINT32 EntryMask;\r
+ UINT32 FirstLevelIdx;\r
+ UINT32 Offset;\r
+ UINT32 NumPageEntries;\r
+ UINT32 Descriptor;\r
+ UINT32 p;\r
+ UINT32 PageTableIndex;\r
+ UINT32 PageTableEntry;\r
+ UINT32 CurrentPageTableEntry;\r
+ VOID *Mva;\r
+\r
+ volatile ARM_FIRST_LEVEL_DESCRIPTOR *FirstLevelTable;\r
+ volatile ARM_PAGE_TABLE_ENTRY *PageTable;\r
+\r
+ Status = EFI_SUCCESS;\r
+\r
+ // EntryMask: bitmask of values to change (1 = change this value, 0 = leave alone)\r
+ // EntryValue: values at bit positions specified by EntryMask\r
+ EntryMask = TT_DESCRIPTOR_PAGE_TYPE_MASK | TT_DESCRIPTOR_PAGE_AP_MASK;\r
+ if (Attributes & EFI_MEMORY_XP) {\r
+ EntryValue = TT_DESCRIPTOR_PAGE_TYPE_PAGE_XN;\r
+ } else {\r
+ EntryValue = TT_DESCRIPTOR_PAGE_TYPE_PAGE;\r
+ }\r
+\r
+ // Although the PI spec is unclear on this, the GCD guarantees that only\r
+ // one Attribute bit is set at a time, so the order of the conditionals below\r
+ // is irrelevant. If no memory attribute is specified, we preserve whatever\r
+ // memory type is set in the page tables, and update the permission attributes\r
+ // only.\r
+ if (Attributes & EFI_MEMORY_UC) {\r
+ // modify cacheability attributes\r
+ EntryMask |= TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK;\r
+ // map to strongly ordered\r
+ EntryValue |= TT_DESCRIPTOR_PAGE_CACHE_POLICY_STRONGLY_ORDERED; // TEX[2:0] = 0, C=0, B=0\r
+ } else if (Attributes & EFI_MEMORY_WC) {\r
+ // modify cacheability attributes\r
+ EntryMask |= TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK;\r
+ // map to normal non-cachable\r
+ EntryValue |= TT_DESCRIPTOR_PAGE_CACHE_POLICY_NON_CACHEABLE; // TEX [2:0]= 001 = 0x2, B=0, C=0\r
+ } else if (Attributes & EFI_MEMORY_WT) {\r
+ // modify cacheability attributes\r
+ EntryMask |= TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK;\r
+ // write through with no-allocate\r
+ EntryValue |= TT_DESCRIPTOR_PAGE_CACHE_POLICY_WRITE_THROUGH_NO_ALLOC; // TEX [2:0] = 0, C=1, B=0\r
+ } else if (Attributes & EFI_MEMORY_WB) {\r
+ // modify cacheability attributes\r
+ EntryMask |= TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK;\r
+ // write back (with allocate)\r
+ EntryValue |= TT_DESCRIPTOR_PAGE_CACHE_POLICY_WRITE_BACK_ALLOC; // TEX [2:0] = 001, C=1, B=1\r
+ } else if (Attributes & CACHE_ATTRIBUTE_MASK) {\r
+ // catch unsupported memory type attributes\r
+ ASSERT (FALSE);\r
+ return EFI_UNSUPPORTED;\r
+ }\r
+\r
+ if (Attributes & EFI_MEMORY_RO) {\r
+ EntryValue |= TT_DESCRIPTOR_PAGE_AP_RO_RO;\r
+ } else {\r
+ EntryValue |= TT_DESCRIPTOR_PAGE_AP_RW_RW;\r
+ }\r
+\r
+ // Obtain page table base\r
+ FirstLevelTable = (ARM_FIRST_LEVEL_DESCRIPTOR *)ArmGetTTBR0BaseAddress ();\r
+\r
+ // Calculate number of 4KB page table entries to change\r
+ NumPageEntries = Length / TT_DESCRIPTOR_PAGE_SIZE;\r
+\r
+ // Iterate for the number of 4KB pages to change\r
+ Offset = 0;\r
+ for(p = 0; p < NumPageEntries; p++) {\r
+ // Calculate index into first level translation table for page table value\r
+\r
+ FirstLevelIdx = TT_DESCRIPTOR_SECTION_BASE_ADDRESS(BaseAddress + Offset) >> TT_DESCRIPTOR_SECTION_BASE_SHIFT;\r
+ ASSERT (FirstLevelIdx < TRANSLATION_TABLE_SECTION_COUNT);\r
+\r
+ // Read the descriptor from the first level page table\r
+ Descriptor = FirstLevelTable[FirstLevelIdx];\r
+\r
+ // Does this descriptor need to be converted from section entry to 4K pages?\r
+ if (!TT_DESCRIPTOR_SECTION_TYPE_IS_PAGE_TABLE(Descriptor)) {\r
+ Status = ConvertSectionToPages (FirstLevelIdx << TT_DESCRIPTOR_SECTION_BASE_SHIFT);\r
+ if (EFI_ERROR(Status)) {\r
+ // Exit for loop\r
+ break;\r
+ }\r
+\r
+ // Re-read descriptor\r
+ Descriptor = FirstLevelTable[FirstLevelIdx];\r
+ if (FlushTlbs != NULL) {\r
+ *FlushTlbs = TRUE;\r
+ }\r
+ }\r
+\r
+ // Obtain page table base address\r
+ PageTable = (ARM_PAGE_TABLE_ENTRY *)TT_DESCRIPTOR_PAGE_BASE_ADDRESS(Descriptor);\r
+\r
+ // Calculate index into the page table\r
+ PageTableIndex = ((BaseAddress + Offset) & TT_DESCRIPTOR_PAGE_INDEX_MASK) >> TT_DESCRIPTOR_PAGE_BASE_SHIFT;\r
+ ASSERT (PageTableIndex < TRANSLATION_TABLE_PAGE_COUNT);\r
+\r
+ // Get the entry\r
+ CurrentPageTableEntry = PageTable[PageTableIndex];\r
+\r
+ // Mask off appropriate fields\r
+ PageTableEntry = CurrentPageTableEntry & ~EntryMask;\r
+\r
+ // Mask in new attributes and/or permissions\r
+ PageTableEntry |= EntryValue;\r
+\r
+ if (VirtualMask != 0) {\r
+ // Make this virtual address point at a physical page\r
+ PageTableEntry &= ~VirtualMask;\r
+ }\r
+\r
+ if (CurrentPageTableEntry != PageTableEntry) {\r
+ Mva = (VOID *)(UINTN)((((UINTN)FirstLevelIdx) << TT_DESCRIPTOR_SECTION_BASE_SHIFT) + (PageTableIndex << TT_DESCRIPTOR_PAGE_BASE_SHIFT));\r
+\r
+ // Clean/invalidate the cache for this page, but only\r
+ // if we are modifying the memory type attributes\r
+ if (((CurrentPageTableEntry ^ PageTableEntry) & TT_DESCRIPTOR_PAGE_CACHE_POLICY_MASK) != 0) {\r
+ WriteBackInvalidateDataCacheRange (Mva, TT_DESCRIPTOR_PAGE_SIZE);\r
+ }\r
+\r
+ // Only need to update if we are changing the entry\r
+ PageTable[PageTableIndex] = PageTableEntry;\r
+ ArmUpdateTranslationTableEntry ((VOID *)&PageTable[PageTableIndex], Mva);\r
+ }\r
+\r
+ Status = EFI_SUCCESS;\r
+ Offset += TT_DESCRIPTOR_PAGE_SIZE;\r
+\r
+ } // End first level translation table loop\r
+\r
+ return Status;\r
+}\r
+\r
+STATIC\r
+EFI_STATUS\r
+UpdateSectionEntries (\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length,\r
+ IN UINT64 Attributes,\r
+ IN EFI_PHYSICAL_ADDRESS VirtualMask\r
+ )\r
+{\r
+ EFI_STATUS Status = EFI_SUCCESS;\r
+ UINT32 EntryMask;\r
+ UINT32 EntryValue;\r
+ UINT32 FirstLevelIdx;\r
+ UINT32 NumSections;\r
+ UINT32 i;\r
+ UINT32 CurrentDescriptor;\r
+ UINT32 Descriptor;\r
+ VOID *Mva;\r
+ volatile ARM_FIRST_LEVEL_DESCRIPTOR *FirstLevelTable;\r
+\r
+ // EntryMask: bitmask of values to change (1 = change this value, 0 = leave alone)\r
+ // EntryValue: values at bit positions specified by EntryMask\r
+\r
+ // Make sure we handle a section range that is unmapped\r
+ EntryMask = TT_DESCRIPTOR_SECTION_TYPE_MASK | TT_DESCRIPTOR_SECTION_XN_MASK |\r
+ TT_DESCRIPTOR_SECTION_AP_MASK;\r
+ EntryValue = TT_DESCRIPTOR_SECTION_TYPE_SECTION;\r
+\r
+ // Although the PI spec is unclear on this, the GCD guarantees that only\r
+ // one Attribute bit is set at a time, so the order of the conditionals below\r
+ // is irrelevant. If no memory attribute is specified, we preserve whatever\r
+ // memory type is set in the page tables, and update the permission attributes\r
+ // only.\r
+ if (Attributes & EFI_MEMORY_UC) {\r
+ // modify cacheability attributes\r
+ EntryMask |= TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK;\r
+ // map to strongly ordered\r
+ EntryValue |= TT_DESCRIPTOR_SECTION_CACHE_POLICY_STRONGLY_ORDERED; // TEX[2:0] = 0, C=0, B=0\r
+ } else if (Attributes & EFI_MEMORY_WC) {\r
+ // modify cacheability attributes\r
+ EntryMask |= TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK;\r
+ // map to normal non-cachable\r
+ EntryValue |= TT_DESCRIPTOR_SECTION_CACHE_POLICY_NON_CACHEABLE; // TEX [2:0]= 001 = 0x2, B=0, C=0\r
+ } else if (Attributes & EFI_MEMORY_WT) {\r
+ // modify cacheability attributes\r
+ EntryMask |= TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK;\r
+ // write through with no-allocate\r
+ EntryValue |= TT_DESCRIPTOR_SECTION_CACHE_POLICY_WRITE_THROUGH_NO_ALLOC; // TEX [2:0] = 0, C=1, B=0\r
+ } else if (Attributes & EFI_MEMORY_WB) {\r
+ // modify cacheability attributes\r
+ EntryMask |= TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK;\r
+ // write back (with allocate)\r
+ EntryValue |= TT_DESCRIPTOR_SECTION_CACHE_POLICY_WRITE_BACK_ALLOC; // TEX [2:0] = 001, C=1, B=1\r
+ } else if (Attributes & CACHE_ATTRIBUTE_MASK) {\r
+ // catch unsupported memory type attributes\r
+ ASSERT (FALSE);\r
+ return EFI_UNSUPPORTED;\r
+ }\r
+\r
+ if (Attributes & EFI_MEMORY_RO) {\r
+ EntryValue |= TT_DESCRIPTOR_SECTION_AP_RO_RO;\r
+ } else {\r
+ EntryValue |= TT_DESCRIPTOR_SECTION_AP_RW_RW;\r
+ }\r
+\r
+ if (Attributes & EFI_MEMORY_XP) {\r
+ EntryValue |= TT_DESCRIPTOR_SECTION_XN_MASK;\r
+ }\r
+\r
+ // obtain page table base\r
+ FirstLevelTable = (ARM_FIRST_LEVEL_DESCRIPTOR *)ArmGetTTBR0BaseAddress ();\r
+\r
+ // calculate index into first level translation table for start of modification\r
+ FirstLevelIdx = TT_DESCRIPTOR_SECTION_BASE_ADDRESS(BaseAddress) >> TT_DESCRIPTOR_SECTION_BASE_SHIFT;\r
+ ASSERT (FirstLevelIdx < TRANSLATION_TABLE_SECTION_COUNT);\r
+\r
+ // calculate number of 1MB first level entries this applies to\r
+ NumSections = Length / TT_DESCRIPTOR_SECTION_SIZE;\r
+\r
+ // iterate through each descriptor\r
+ for(i=0; i<NumSections; i++) {\r
+ CurrentDescriptor = FirstLevelTable[FirstLevelIdx + i];\r
+\r
+ // has this descriptor already been coverted to pages?\r
+ if (TT_DESCRIPTOR_SECTION_TYPE_IS_PAGE_TABLE(CurrentDescriptor)) {\r
+ // forward this 1MB range to page table function instead\r
+ Status = UpdatePageEntries (\r
+ (FirstLevelIdx + i) << TT_DESCRIPTOR_SECTION_BASE_SHIFT,\r
+ TT_DESCRIPTOR_SECTION_SIZE,\r
+ Attributes,\r
+ VirtualMask,\r
+ NULL);\r
+ } else {\r
+ // still a section entry\r
+\r
+ // mask off appropriate fields\r
+ Descriptor = CurrentDescriptor & ~EntryMask;\r
+\r
+ // mask in new attributes and/or permissions\r
+ Descriptor |= EntryValue;\r
+ if (VirtualMask != 0) {\r
+ Descriptor &= ~VirtualMask;\r
+ }\r
+\r
+ if (CurrentDescriptor != Descriptor) {\r
+ Mva = (VOID *)(UINTN)(((UINTN)FirstLevelTable) << TT_DESCRIPTOR_SECTION_BASE_SHIFT);\r
+\r
+ // Clean/invalidate the cache for this section, but only\r
+ // if we are modifying the memory type attributes\r
+ if (((CurrentDescriptor ^ Descriptor) & TT_DESCRIPTOR_SECTION_CACHE_POLICY_MASK) != 0) {\r
+ WriteBackInvalidateDataCacheRange (Mva, SIZE_1MB);\r
+ }\r
+\r
+ // Only need to update if we are changing the descriptor\r
+ FirstLevelTable[FirstLevelIdx + i] = Descriptor;\r
+ ArmUpdateTranslationTableEntry ((VOID *)&FirstLevelTable[FirstLevelIdx + i], Mva);\r
+ }\r
+\r
+ Status = EFI_SUCCESS;\r
+ }\r
+ }\r
+\r
+ return Status;\r
+}\r
+\r
+EFI_STATUS\r
+ArmSetMemoryAttributes (\r
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINT64 Length,\r
+ IN UINT64 Attributes,\r
+ IN EFI_PHYSICAL_ADDRESS VirtualMask\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ UINT64 ChunkLength;\r
+ BOOLEAN FlushTlbs;\r
+\r
+ if (Length == 0) {\r
+ return EFI_SUCCESS;\r
+ }\r
+\r
+ FlushTlbs = FALSE;\r
+ while (Length > 0) {\r
+ if ((BaseAddress % TT_DESCRIPTOR_SECTION_SIZE == 0) &&\r
+ Length >= TT_DESCRIPTOR_SECTION_SIZE) {\r
+\r
+ ChunkLength = Length - Length % TT_DESCRIPTOR_SECTION_SIZE;\r
+\r
+ DEBUG ((DEBUG_PAGE,\r
+ "SetMemoryAttributes(): MMU section 0x%lx length 0x%lx to %lx\n",\r
+ BaseAddress, ChunkLength, Attributes));\r
+\r
+ Status = UpdateSectionEntries (BaseAddress, ChunkLength, Attributes,\r
+ VirtualMask);\r
+\r
+ FlushTlbs = TRUE;\r
+ } else {\r
+\r
+ //\r
+ // Process page by page until the next section boundary, but only if\r
+ // we have more than a section's worth of area to deal with after that.\r
+ //\r
+ ChunkLength = TT_DESCRIPTOR_SECTION_SIZE -\r
+ (BaseAddress % TT_DESCRIPTOR_SECTION_SIZE);\r
+ if (ChunkLength + TT_DESCRIPTOR_SECTION_SIZE > Length) {\r
+ ChunkLength = Length;\r
+ }\r
+\r
+ DEBUG ((DEBUG_PAGE,\r
+ "SetMemoryAttributes(): MMU page 0x%lx length 0x%lx to %lx\n",\r
+ BaseAddress, ChunkLength, Attributes));\r
+\r
+ Status = UpdatePageEntries (BaseAddress, ChunkLength, Attributes,\r
+ VirtualMask, &FlushTlbs);\r
+ }\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ break;\r
+ }\r
+\r
+ BaseAddress += ChunkLength;\r
+ Length -= ChunkLength;\r
+ }\r
+\r
+ if (FlushTlbs) {\r
+ ArmInvalidateTlb ();\r
+ }\r
+ return Status;\r
+}\r
\r
EFI_STATUS\r
ArmSetMemoryRegionNoExec (\r
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