Move FirmwareFeature generation

Resources/generate_smbios.py

@@ -1,4 +1,5 @@
 from Data import smbios_data, os_data
+from Resources import Utilities
 
 def set_smbios_model_spoof(model):
     try:
@@ -50,4 +51,25 @@ def set_smbios_model_spoof(model):
                 return "iMac17,1"
         else:
             # Unknown Model
-            raise Exception
+            raise Exception
+
+def update_firmware_features(firmwarefeature):
+    # Adjust FirmwareFeature to support everything macOS requires
+    # APFS Bit (19/20): 10.13+ (OSInstall)
+    # Large BaseSystem Bit (35): 12.0 B7+ (patchd)
+    # https://github.com/acidanthera/OpenCorePkg/tree/2f76673546ac3e32d2e2d528095fddcd66ad6a23/Include/Apple/IndustryStandard/AppleFeatures.h
+    firmwarefeature |= 2 ** 19  # FW_FEATURE_SUPPORTS_APFS
+    firmwarefeature |= 2 ** 20  # FW_FEATURE_SUPPORTS_APFS_EXTRA
+    firmwarefeature |= 2 ** 35  # FW_FEATURE_SUPPORTS_LARGE_BASESYSTEM
+    return firmwarefeature
+    
+def generate_fw_features(model, custom):
+    if not custom:
+        firmwarefeature = Utilities.get_rom("firmware-features")
+        if not firmwarefeature:
+            print("- Failed to find FirmwareFeatures, falling back on defaults")
+            firmwarefeature = int(smbios_data.smbios_dictionary[model]["FirmwareFeatures"], 16)
+    else:
+        firmwarefeature = int(smbios_data.smbios_dictionary[model]["FirmwareFeatures"], 16)
+    firmwarefeature = update_firmware_features(firmwarefeature)
+    return firmwarefeature