Implement BlGetRandomValue() and BlInitializeEntropy() routines for future KASLR support

sdk/xtdk/bltypes.h

@@ -68,8 +68,10 @@ typedef EFI_STATUS (*PBL_GET_CONFIGURATION_TABLE)(IN PEFI_GUID TableGuid, OUT PV
 typedef VOID (*PBL_GET_MAPPINGS_COUNT)(IN PXTBL_PAGE_MAPPING PageMap, OUT PULONG NumberOfMappings);
 typedef EFI_STATUS (*PBL_GET_MEMORY_MAP)(OUT PEFI_MEMORY_MAP MemoryMap);
 typedef PLIST_ENTRY (*PBL_GET_MODULES_LIST)();
+typedef ULONGLONG (*PBL_GET_RANDOM_VALUE)(IN OUT PULONGLONG RNGBuffer);
 typedef INT_PTR (*PBL_GET_SECURE_BOOT_STATUS)();
 typedef PVOID (*PBL_GET_VIRTUAL_ADDRESS)(IN PXTBL_PAGE_MAPPING PageMap, IN PVOID PhysicalAddress);
+typedef EFI_STATUS (*PBL_INITIALIZE_ENTROPY)(PULONGLONG RNGBuffer);
 typedef VOID (*PBL_INITIALIZE_PAGE_MAP)(OUT PXTBL_PAGE_MAPPING PageMap, IN SHORT PageMapLevel, IN PAGE_SIZE PageSize);
 typedef EFI_STATUS (*PBL_INSTALL_XT_PROTOCOL)(IN PVOID Interface, IN PEFI_GUID Guid);
 typedef EFI_STATUS (*PBL_INVOKE_BOOT_PROTOCOL)(IN PLIST_ENTRY OptionsList);
@@ -375,7 +377,9 @@ typedef struct _XTBL_LOADER_PROTOCOL
     {
         PBL_EXIT_BOOT_SERVICES ExitBootServices;
         PBL_GET_CONFIGURATION_TABLE GetConfigurationTable;
+        PBL_GET_RANDOM_VALUE GetRandomValue;
         PBL_GET_SECURE_BOOT_STATUS GetSecureBootStatus;
+        PBL_INITIALIZE_ENTROPY InitializeEntropy;
         PBL_LOAD_EFI_IMAGE LoadEfiImage;
         PBL_POWER_SYSTEM RebootSystem;
         PBL_POWER_SYSTEM ShutdownSystem;