diff --git a/headers/private/kernel/platform/efi/protocol/device-path.h b/headers/private/kernel/platform/efi/protocol/device-path.h
index 4f5511db3c..e31215e024 100644
--- a/headers/private/kernel/platform/efi/protocol/device-path.h
+++ b/headers/private/kernel/platform/efi/protocol/device-path.h
@@ -33,6 +33,25 @@ typedef struct efi_device_path_protocol {
 #define DEVICE_PATH_HW_CONTROLLER 0x05
 #define DEVICE_PATH_HW_BMC        0x06
 
+#define DEVICE_PATH_MESSAGING_ATAPI	    0x01
+#define DEVICE_PATH_MESSAGING_SCSI	    0x02
+#define DEVICE_PATH_MESSAGING_FIBRE_CHANNEL 0x03
+#define DEVICE_PATH_MESSAGING_1394	    0x04
+#define DEVICE_PATH_MESSAGING_USB	    0x05
+#define DEVICE_PATH_MESSAGING_I2O	    0x06
+#define DEVICE_PATH_MESSAGING_INFINIBAND    0x09
+#define DEVICE_PATH_MESSAGING_VENDOR	    0x0a
+#define DEVICE_PATH_MESSAGING_MAC	    0x0b
+#define DEVICE_PATH_MESSAGING_IPV4	    0x0c
+#define DEVICE_PATH_MESSAGING_IPV6	    0x0d
+#define DEVICE_PATH_MESSAGING_UART	    0x0e
+#define DEVICE_PATH_MESSAGING_USB_CLASS	    0x0f
+#define DEVICE_PATH_MESSAGING_USB_WWID	    0x10
+#define DEVICE_PATH_MESSAGING_USB_LUN	    0x11
+#define DEVICE_PATH_MESSAGING_SATA	    0x12
+#define DEVICE_PATH_MESSAGING_VLAN	    0x14
+#define DEVICE_PATH_MESSAGING_FIBRE_CHANNEL_EX 0x15
+
 // TODO: sub-types for other types (ACPI, etc)
 
 // DEVICE_PATH_MEDIA Types
diff --git a/headers/private/kernel/platform/efi/protocol/serial-io.h b/headers/private/kernel/platform/efi/protocol/serial-io.h
index fa338fd66c..c19b9b672e 100644
--- a/headers/private/kernel/platform/efi/protocol/serial-io.h
+++ b/headers/private/kernel/platform/efi/protocol/serial-io.h
@@ -13,7 +13,27 @@
 
 extern efi_guid SerialIoProtocol;
 
+#define EFI_SERIAL_TERMINAL_DEVICE_TYPE_GUID \
+    {0x6ad9a60f, 0x5815, 0x4c7c, {0x8A, 0x10, 0x50, 0x53, 0xD2, 0xBF, 0x7A, 0x1B}}
+
+
 #define EFI_SERIAL_IO_PROTOCOL_REVISION 0x00010000
+#define EFI_SERIAL_IO_PROTOCOL_REVISION1p1 0x00010001
+
+//
+// Control bits.
+//
+#define EFI_SERIAL_CLEAR_TO_SEND 0x0010
+#define EFI_SERIAL_DATA_SET_READY 0x0020
+#define EFI_SERIAL_RING_INDICATE 0x0040
+#define EFI_SERIAL_CARRIER_DETECT 0x0080
+#define EFI_SERIAL_REQUEST_TO_SEND 0x0002
+#define EFI_SERIAL_DATA_TERMINAL_READY 0x0001
+#define EFI_SERIAL_INPUT_BUFFER_EMPTY 0x0100
+#define EFI_SERIAL_OUTPUT_BUFFER_EMPTY 0x0200
+#define EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE 0x1000
+#define EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE 0x2000
+#define EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE 0x4000
 
 typedef struct efi_serial_io_protocol efi_serial_io_protocol;
 
@@ -64,4 +84,5 @@ typedef struct efi_serial_io_protocol {
                        size_t* BufferSize, void* Buffer) EFIAPI;
 
     efi_serial_io_mode* Mode;
+    const struct elf_guid* DeviceTypeGuid;  // Revision 1.1
 } efi_serial_io_protocol;