#include <Library/MemoryAllocationLib.h>\r
#include "CpuDxe.h"\r
\r
-// First Level Descriptors\r
-typedef UINT32 ARM_FIRST_LEVEL_DESCRIPTOR;\r
-\r
-// Second Level Descriptors\r
-typedef UINT32 ARM_PAGE_TABLE_ENTRY;\r
-\r
EFI_STATUS\r
SectionToGcdAttributes (\r
IN UINT32 SectionAttributes,\r
return EFI_SUCCESS;\r
}\r
\r
-\r
-\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;\r
- EntryValue = TT_DESCRIPTOR_PAGE_TYPE_PAGE;\r
- // Although the PI spec is unclear on this the GCD guarantees that only\r
- // one Attribute bit is set at a time, so we can safely use a switch statement\r
- switch (Attributes) {\r
- case 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
- break;\r
-\r
- case 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
- break;\r
-\r
- case 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
- break;\r
-\r
- case 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
- break;\r
-\r
- case EFI_MEMORY_WP:\r
- case EFI_MEMORY_XP:\r
- case EFI_MEMORY_UCE:\r
- // cannot be implemented UEFI definition unclear for ARM\r
- // Cause a page fault if these ranges are accessed.\r
- EntryValue = TT_DESCRIPTOR_PAGE_TYPE_FAULT;\r
- DEBUG ((EFI_D_PAGE, "SetMemoryAttributes(): setting page %lx with unsupported attribute %x will page fault on access\n", BaseAddress, Attributes));\r
- break;\r
-\r
- default:\r
- return EFI_UNSUPPORTED;\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
- // Only need to update if we are changing the entry\r
- PageTable[PageTableIndex] = PageTableEntry;\r
- ArmUpdateTranslationTableEntry ((VOID *)&PageTable[PageTableIndex], Mva);\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
-\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
-\r
-\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;\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 we can safely use a switch statement\r
- switch(Attributes) {\r
- case 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
- break;\r
-\r
- case 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
- break;\r
-\r
- case 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
- break;\r
-\r
- case 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
- break;\r
-\r
- case EFI_MEMORY_WP:\r
- case EFI_MEMORY_XP:\r
- case EFI_MEMORY_RP:\r
- case EFI_MEMORY_UCE:\r
- // cannot be implemented UEFI definition unclear for ARM\r
- // Cause a page fault if these ranges are accessed.\r
- EntryValue = TT_DESCRIPTOR_SECTION_TYPE_FAULT;\r
- DEBUG ((EFI_D_PAGE, "SetMemoryAttributes(): setting section %lx with unsupported attribute %x will page fault on access\n", BaseAddress, Attributes));\r
- break;\r
-\r
-\r
- default:\r
- return EFI_UNSUPPORTED;\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
- // Only need to update if we are changing the descriptor\r
- FirstLevelTable[FirstLevelIdx + i] = Descriptor;\r
- ArmUpdateTranslationTableEntry ((VOID *)&FirstLevelTable[FirstLevelIdx + i], Mva);\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
-\r
- Status = EFI_SUCCESS;\r
- }\r
- }\r
-\r
- return Status;\r
-}\r
-\r
-EFI_STATUS\r
-ConvertSectionToPages (\r
- IN EFI_PHYSICAL_ADDRESS BaseAddress\r
- )\r
-{\r
- EFI_STATUS Status;\r
- EFI_PHYSICAL_ADDRESS PageTableAddr;\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
- Status = gBS->AllocatePages (AllocateAnyPages, EfiBootServicesData, 1, &PageTableAddr);\r
- if (EFI_ERROR(Status)) {\r
- return Status;\r
- }\r
-\r
- PageTable = (volatile ARM_PAGE_TABLE_ENTRY *)(UINTN)PageTableAddr;\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 *)(UINTN)PageTableAddr, TT_DESCRIPTOR_PAGE_SIZE);\r
-\r
- // Formulate page table entry, Domain=0, NS=0\r
- PageTableDescriptor = (((UINTN)PageTableAddr) & 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
-\r
-\r
-EFI_STATUS\r
-SetMemoryAttributes (\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
- //\r
- // Ignore invocations that only modify permission bits\r
- //\r
- if ((Attributes & EFI_MEMORY_CACHETYPE_MASK) == 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
UINT64\r
EfiAttributeToArmAttribute (\r
IN UINT64 EfiAttributes\r
\r
// Get the section at the given index\r
SectionDescriptor = FirstLevelTable[TableIndex];\r
+ if (!SectionDescriptor) {\r
+ return EFI_NOT_FOUND;\r
+ }\r
\r
// If 'BaseAddress' belongs to the section then round it to the section boundary\r
if (((SectionDescriptor & TT_DESCRIPTOR_SECTION_TYPE_MASK) == TT_DESCRIPTOR_SECTION_TYPE_SECTION) ||\r
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