STATIC
VOID
ReplaceLiveEntry (
IN UINT64 *Entry,
IN UINT64 Value
)
{
if (!ArmMmuEnabled ()) {
*Entry = Value;
} else {
ArmReplaceLiveTranslationEntry (Entry, Value);
}
}
EFI_STATUS
SyncCacheConfig (
IN EFI_CPU_ARCH_PROTOCOL *CpuProtocol
)
{
EFI_STATUS Status;
UINT32 PageAttribute = 0;
UINT64 *FirstLevelTableAddress;
UINTN TableLevel;
UINTN TableCount;
UINTN NumberOfDescriptors;
EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemorySpaceMap;
UINTN Tcr;
UINTN T0SZ;
UINT64 BaseAddressGcdRegion;
UINT64 EndAddressGcdRegion;
// This code assumes MMU is enabled and filed with section translations
ASSERT (ArmMmuEnabled ());
//
// Get the memory space map from GCD
//
MemorySpaceMap = NULL;
Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemorySpaceMap);
ASSERT_EFI_ERROR (Status);
// The GCD implementation maintains its own copy of the state of memory space attributes. GCD needs
// to know what the initial memory space attributes are. The CPU Arch. Protocol does not provide a
// GetMemoryAttributes function for GCD to get this so we must resort to calling GCD (as if we were
// a client) to update its copy of the attributes. This is bad architecture and should be replaced
// with a way for GCD to query the CPU Arch. driver of the existing memory space attributes instead.
// Obtain page table base
FirstLevelTableAddress = (UINT64*)(ArmGetTTBR0BaseAddress ());
// Get Translation Control Register value
Tcr = ArmGetTCR ();
// Get Address Region Size
T0SZ = Tcr & TCR_T0SZ_MASK;
// Get the level of the first table for the indicated Address Region Size
GetRootTranslationTableInfo (T0SZ, &TableLevel, &TableCount);
// First Attribute of the Page Tables
PageAttribute = GetFirstPageAttribute (FirstLevelTableAddress, TableLevel);
// We scan from the start of the memory map (ie: at the address 0x0)
BaseAddressGcdRegion = 0x0;
EndAddressGcdRegion = GetNextEntryAttribute (FirstLevelTableAddress,
TableCount, TableLevel,
BaseAddressGcdRegion,
&PageAttribute, &BaseAddressGcdRegion);
// Update GCD with the last region if valid
if (PageAttribute != TT_ATTR_INDX_INVALID) {
SetGcdMemorySpaceAttributes (MemorySpaceMap, NumberOfDescriptors,
BaseAddressGcdRegion,
EndAddressGcdRegion - BaseAddressGcdRegion,
PageAttributeToGcdAttribute (PageAttribute));
}
FreePool (MemorySpaceMap);
return EFI_SUCCESS;
}
