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
@@ -194,3 +194,149 @@ SyncCacheConfig (
|
||||
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
|
||||
UINT64
|
||||
EfiAttributeToArmAttribute (
|
||||
IN UINT64 EfiAttributes
|
||||
)
|
||||
{
|
||||
UINT64 ArmAttributes;
|
||||
|
||||
switch (EfiAttributes & EFI_MEMORY_CACHETYPE_MASK) {
|
||||
case EFI_MEMORY_UC:
|
||||
ArmAttributes = TT_ATTR_INDX_DEVICE_MEMORY;
|
||||
break;
|
||||
case EFI_MEMORY_WC:
|
||||
ArmAttributes = TT_ATTR_INDX_MEMORY_NON_CACHEABLE;
|
||||
break;
|
||||
case EFI_MEMORY_WT:
|
||||
ArmAttributes = TT_ATTR_INDX_MEMORY_WRITE_THROUGH;
|
||||
break;
|
||||
case EFI_MEMORY_WB:
|
||||
ArmAttributes = TT_ATTR_INDX_MEMORY_WRITE_BACK;
|
||||
break;
|
||||
default:
|
||||
DEBUG ((EFI_D_ERROR, "EfiAttributeToArmAttribute: 0x%lX attributes is not supported.\n", EfiAttributes));
|
||||
ASSERT (0);
|
||||
ArmAttributes = TT_ATTR_INDX_DEVICE_MEMORY;
|
||||
}
|
||||
|
||||
// Set the access flag to match the block attributes
|
||||
ArmAttributes |= TT_AF;
|
||||
|
||||
// Determine protection attributes
|
||||
if (EfiAttributes & EFI_MEMORY_WP) {
|
||||
ArmAttributes |= TT_AP_RO_RO;
|
||||
}
|
||||
|
||||
// Process eXecute Never attribute
|
||||
if (EfiAttributes & EFI_MEMORY_XP) {
|
||||
ArmAttributes |= TT_PXN_MASK;
|
||||
}
|
||||
|
||||
return ArmAttributes;
|
||||
}
|
||||
|
||||
// This function will recursively go down the page table to find the first block address linked to 'BaseAddress'.
|
||||
// And then the function will identify the size of the region that has the same page table attribute.
|
||||
EFI_STATUS
|
||||
GetMemoryRegionRec (
|
||||
IN UINT64 *TranslationTable,
|
||||
IN UINTN TableLevel,
|
||||
IN UINT64 *LastBlockEntry,
|
||||
IN OUT UINTN *BaseAddress,
|
||||
OUT UINTN *RegionLength,
|
||||
OUT UINTN *RegionAttributes
|
||||
)
|
||||
{
|
||||
EFI_STATUS Status;
|
||||
UINT64 *NextTranslationTable;
|
||||
UINT64 *BlockEntry;
|
||||
UINT64 BlockEntryType;
|
||||
UINT64 EntryType;
|
||||
|
||||
if (TableLevel != 3) {
|
||||
BlockEntryType = TT_TYPE_BLOCK_ENTRY;
|
||||
} else {
|
||||
BlockEntryType = TT_TYPE_BLOCK_ENTRY_LEVEL3;
|
||||
}
|
||||
|
||||
// Find the block entry linked to the Base Address
|
||||
BlockEntry = (UINT64*)TT_GET_ENTRY_FOR_ADDRESS (TranslationTable, TableLevel, *BaseAddress);
|
||||
EntryType = *BlockEntry & TT_TYPE_MASK;
|
||||
|
||||
if (EntryType == TT_TYPE_TABLE_ENTRY) {
|
||||
NextTranslationTable = (UINT64*)(*BlockEntry & TT_ADDRESS_MASK_DESCRIPTION_TABLE);
|
||||
|
||||
// The entry is a page table, so we go to the next level
|
||||
Status = GetMemoryRegionRec (
|
||||
NextTranslationTable, // Address of the next level page table
|
||||
TableLevel + 1, // Next Page Table level
|
||||
(UINTN*)TT_LAST_BLOCK_ADDRESS(NextTranslationTable, TT_ENTRY_COUNT),
|
||||
BaseAddress, RegionLength, RegionAttributes);
|
||||
|
||||
// In case of 'Success', it means the end of the block region has been found into the upper
|
||||
// level translation table
|
||||
if (!EFI_ERROR(Status)) {
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
} else if (EntryType == BlockEntryType) {
|
||||
// We have found the BlockEntry attached to the address. We save its start address (the start
|
||||
// address might be before the 'BaseAdress') and attributes
|
||||
*BaseAddress = *BaseAddress & ~(TT_ADDRESS_AT_LEVEL(TableLevel) - 1);
|
||||
*RegionLength = 0;
|
||||
*RegionAttributes = *BlockEntry & TT_ATTRIBUTES_MASK;
|
||||
} else {
|
||||
// We have an 'Invalid' entry
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
while (BlockEntry <= LastBlockEntry) {
|
||||
if ((*BlockEntry & TT_ATTRIBUTES_MASK) == *RegionAttributes) {
|
||||
*RegionLength = *RegionLength + TT_BLOCK_ENTRY_SIZE_AT_LEVEL(TableLevel);
|
||||
} else {
|
||||
// In case we have found the end of the region we return success
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
BlockEntry++;
|
||||
}
|
||||
|
||||
// If we have reached the end of the TranslationTable and we have not found the end of the region then
|
||||
// we return EFI_NOT_FOUND.
|
||||
// The caller will continue to look for the memory region at its level
|
||||
return EFI_NOT_FOUND;
|
||||
}
|
||||
|
||||
EFI_STATUS
|
||||
GetMemoryRegion (
|
||||
IN OUT UINTN *BaseAddress,
|
||||
OUT UINTN *RegionLength,
|
||||
OUT UINTN *RegionAttributes
|
||||
)
|
||||
{
|
||||
EFI_STATUS Status;
|
||||
UINT64 *TranslationTable;
|
||||
UINTN TableLevel;
|
||||
UINTN EntryCount;
|
||||
UINTN T0SZ;
|
||||
|
||||
ASSERT ((BaseAddress != NULL) && (RegionLength != NULL) && (RegionAttributes != NULL));
|
||||
|
||||
TranslationTable = ArmGetTTBR0BaseAddress ();
|
||||
|
||||
T0SZ = ArmGetTCR () & TCR_T0SZ_MASK;
|
||||
// Get the Table info from T0SZ
|
||||
GetRootTranslationTableInfo (T0SZ, &TableLevel, &EntryCount);
|
||||
|
||||
Status = GetMemoryRegionRec (TranslationTable, TableLevel,
|
||||
(UINTN*)TT_LAST_BLOCK_ADDRESS(TranslationTable, EntryCount),
|
||||
BaseAddress, RegionLength, RegionAttributes);
|
||||
|
||||
// If the region continues up to the end of the root table then GetMemoryRegionRec()
|
||||
// will return EFI_NOT_FOUND
|
||||
if (Status == EFI_NOT_FOUND) {
|
||||
return EFI_SUCCESS;
|
||||
} else {
|
||||
return Status;
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user