ArmPkg/CpuDxe: Added support to not set a memory region with the same attribute
Changing the attribute implies some cache management (clean & invalidate). Preventing the cache management should improve the performance. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14568 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Olivier Martin
committed by
oliviermartin
oliviermartin
parent
6adbd5b4d2
commit
2e969d2e9e
@@ -696,3 +696,185 @@ SetMemoryAttributes (
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return Status;
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}
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UINT64
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EfiAttributeToArmAttribute (
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IN UINT64 EfiAttributes
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)
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{
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UINT64 ArmAttributes;
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switch (EfiAttributes & EFI_MEMORY_CACHETYPE_MASK) {
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case EFI_MEMORY_UC:
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// Map to strongly ordered
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ArmAttributes = TT_DESCRIPTOR_SECTION_CACHE_POLICY_STRONGLY_ORDERED; // TEX[2:0] = 0, C=0, B=0
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break;
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case EFI_MEMORY_WC:
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// Map to normal non-cachable
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ArmAttributes = TT_DESCRIPTOR_SECTION_CACHE_POLICY_NON_CACHEABLE; // TEX [2:0]= 001 = 0x2, B=0, C=0
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break;
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case EFI_MEMORY_WT:
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// Write through with no-allocate
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ArmAttributes = TT_DESCRIPTOR_SECTION_CACHE_POLICY_WRITE_THROUGH_NO_ALLOC; // TEX [2:0] = 0, C=1, B=0
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break;
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case EFI_MEMORY_WB:
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// Write back (with allocate)
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ArmAttributes = TT_DESCRIPTOR_SECTION_CACHE_POLICY_WRITE_BACK_ALLOC; // TEX [2:0] = 001, C=1, B=1
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break;
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case EFI_MEMORY_WP:
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case EFI_MEMORY_XP:
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case EFI_MEMORY_RP:
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case EFI_MEMORY_UCE:
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default:
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// Cannot be implemented UEFI definition unclear for ARM
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// Cause a page fault if these ranges are accessed.
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ArmAttributes = TT_DESCRIPTOR_SECTION_TYPE_FAULT;
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DEBUG ((EFI_D_PAGE, "SetMemoryAttributes(): Unsupported attribute %x will page fault on access\n", EfiAttributes));
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break;
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}
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// Determine protection attributes
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if (EfiAttributes & EFI_MEMORY_WP) {
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ArmAttributes |= TT_DESCRIPTOR_SECTION_AP_RO_RO;
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} else {
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ArmAttributes |= TT_DESCRIPTOR_SECTION_AP_RW_RW;
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}
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// Determine eXecute Never attribute
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if (EfiAttributes & EFI_MEMORY_XP) {
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ArmAttributes |= TT_DESCRIPTOR_SECTION_XN_MASK;
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}
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return ArmAttributes;
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}
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EFI_STATUS
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GetMemoryRegionPage (
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IN UINT32 *PageTable,
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IN OUT UINTN *BaseAddress,
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OUT UINTN *RegionLength,
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OUT UINTN *RegionAttributes
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)
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{
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UINT32 PageAttributes;
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UINT32 TableIndex;
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UINT32 PageDescriptor;
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// Convert the section attributes into page attributes
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PageAttributes = ConvertSectionAttributesToPageAttributes (*RegionAttributes, 0);
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// Calculate index into first level translation table for start of modification
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TableIndex = TT_DESCRIPTOR_PAGE_BASE_ADDRESS(*BaseAddress) >> TT_DESCRIPTOR_PAGE_BASE_SHIFT;
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ASSERT (TableIndex < TRANSLATION_TABLE_PAGE_COUNT);
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// Go through the page table to find the end of the section
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for (; TableIndex < TRANSLATION_TABLE_PAGE_COUNT; TableIndex++) {
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// Get the section at the given index
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PageDescriptor = PageTable[TableIndex];
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if ((PageDescriptor & TT_DESCRIPTOR_PAGE_TYPE_MASK) == TT_DESCRIPTOR_PAGE_TYPE_FAULT) {
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// Case: End of the boundary of the region
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return EFI_SUCCESS;
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} else if ((PageDescriptor & TT_DESCRIPTOR_PAGE_TYPE_PAGE) == TT_DESCRIPTOR_PAGE_TYPE_PAGE) {
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if ((PageDescriptor & TT_DESCRIPTOR_PAGE_ATTRIBUTE_MASK) == PageAttributes) {
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*RegionLength = *RegionLength + TT_DESCRIPTOR_PAGE_SIZE;
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} else {
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// Case: End of the boundary of the region
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return EFI_SUCCESS;
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}
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} else {
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// We do not support Large Page yet. We return EFI_SUCCESS that means end of the region.
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ASSERT(0);
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return EFI_SUCCESS;
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}
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}
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return EFI_NOT_FOUND;
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}
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EFI_STATUS
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GetMemoryRegion (
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IN OUT UINTN *BaseAddress,
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OUT UINTN *RegionLength,
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OUT UINTN *RegionAttributes
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)
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{
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EFI_STATUS Status;
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UINT32 TableIndex;
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UINT32 PageAttributes;
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UINT32 PageTableIndex;
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UINT32 SectionDescriptor;
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ARM_FIRST_LEVEL_DESCRIPTOR *FirstLevelTable;
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UINT32 *PageTable;
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// Initialize the arguments
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*RegionLength = 0;
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// Obtain page table base
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FirstLevelTable = (ARM_FIRST_LEVEL_DESCRIPTOR *)ArmGetTTBR0BaseAddress ();
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// Calculate index into first level translation table for start of modification
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TableIndex = TT_DESCRIPTOR_SECTION_BASE_ADDRESS (*BaseAddress) >> TT_DESCRIPTOR_SECTION_BASE_SHIFT;
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ASSERT (TableIndex < TRANSLATION_TABLE_SECTION_COUNT);
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// Get the section at the given index
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SectionDescriptor = FirstLevelTable[TableIndex];
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// If 'BaseAddress' belongs to the section then round it to the section boundary
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if (((SectionDescriptor & TT_DESCRIPTOR_SECTION_TYPE_MASK) == TT_DESCRIPTOR_SECTION_TYPE_SECTION) ||
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((SectionDescriptor & TT_DESCRIPTOR_SECTION_TYPE_MASK) == TT_DESCRIPTOR_SECTION_TYPE_SUPERSECTION))
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{
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*BaseAddress = (*BaseAddress) & TT_DESCRIPTOR_SECTION_BASE_ADDRESS_MASK;
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*RegionAttributes = SectionDescriptor & TT_DESCRIPTOR_SECTION_ATTRIBUTE_MASK;
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} else {
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// Otherwise, we round it to the page boundary
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*BaseAddress = (*BaseAddress) & TT_DESCRIPTOR_PAGE_BASE_ADDRESS_MASK;
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// Get the attribute at the page table level (Level 2)
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PageTable = (UINT32*)(SectionDescriptor & TT_DESCRIPTOR_SECTION_PAGETABLE_ADDRESS_MASK);
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// Calculate index into first level translation table for start of modification
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PageTableIndex = TT_DESCRIPTOR_PAGE_BASE_ADDRESS (*BaseAddress) >> TT_DESCRIPTOR_PAGE_BASE_SHIFT;
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ASSERT (PageTableIndex < TRANSLATION_TABLE_PAGE_COUNT);
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PageAttributes = PageTable[PageTableIndex] & TT_DESCRIPTOR_PAGE_ATTRIBUTE_MASK;
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*RegionAttributes = TT_DESCRIPTOR_CONVERT_TO_SECTION_CACHE_POLICY (PageAttributes, 0) |
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TT_DESCRIPTOR_CONVERT_TO_SECTION_AP (PageAttributes);
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}
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for (;TableIndex < TRANSLATION_TABLE_SECTION_COUNT; TableIndex++) {
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// Get the section at the given index
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SectionDescriptor = FirstLevelTable[TableIndex];
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// If the entry is a level-2 page table then we scan it to find the end of the region
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if ((SectionDescriptor & TT_DESCRIPTOR_SECTION_TYPE_MASK) == TT_DESCRIPTOR_SECTION_TYPE_PAGE_TABLE) {
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// Extract the page table location from the descriptor
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PageTable = (UINT32*)(SectionDescriptor & TT_DESCRIPTOR_SECTION_PAGETABLE_ADDRESS_MASK);
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// Scan the page table to find the end of the region.
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Status = GetMemoryRegionPage (PageTable, BaseAddress, RegionLength, RegionAttributes);
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// If we have found the end of the region (Status == EFI_SUCCESS) then we exit the for-loop
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if (Status == EFI_SUCCESS) {
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break;
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}
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} else if (((SectionDescriptor & TT_DESCRIPTOR_SECTION_TYPE_MASK) == TT_DESCRIPTOR_SECTION_TYPE_SECTION) ||
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((SectionDescriptor & TT_DESCRIPTOR_SECTION_TYPE_MASK) == TT_DESCRIPTOR_SECTION_TYPE_SUPERSECTION)) {
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if ((SectionDescriptor & TT_DESCRIPTOR_SECTION_ATTRIBUTE_MASK) != *RegionAttributes) {
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// If the attributes of the section differ from the one targeted then we exit the loop
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break;
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} else {
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*RegionLength = *RegionLength + TT_DESCRIPTOR_SECTION_SIZE;
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}
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} else {
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// If we are on an invalid section then it means it is the end of our section.
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break;
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}
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}
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return EFI_SUCCESS;
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}
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