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-rw-r--r--MdePkg/Include/Protocol/DevicePath.h26
1 files changed, 23 insertions, 3 deletions
diff --git a/MdePkg/Include/Protocol/DevicePath.h b/MdePkg/Include/Protocol/DevicePath.h
index 1286372f03..2103452909 100644
--- a/MdePkg/Include/Protocol/DevicePath.h
+++ b/MdePkg/Include/Protocol/DevicePath.h
@@ -40,10 +40,30 @@
#pragma pack(1)
+/**
+ This protocol can be used on any device handle to obtain generic path/location
+ information concerning the physical device or logical device. If the handle does
+ not logically map to a physical device, the handle may not necessarily support
+ the device path protocol. The device path describes the location of the device
+ the handle is for. The size of the Device Path can be determined from the structures
+ that make up the Device Path.
+**/
typedef struct {
- UINT8 Type;
- UINT8 SubType;
- UINT8 Length[2];
+ UINT8 Type; ///< 0x01 - Hardware Device Path
+ ///< 0x02 – ACPI Device Path
+ ///< 0x03 – Messaging Device Path
+ ///< 0x04 – Media Device Path
+ ///< 0x05 – BIOS Boot Specification Device Path
+ ///< 0x7F – End of Hardware Device Path
+
+ UINT8 SubType; ///< Varies by Type
+ ///< 0xFF – End Entire Device Path, or
+ ///< 0x01 – End This Instance of a Device Path and start a new
+ ///< Device Path
+
+ UINT8 Length[2]; ///< Specific Device Path data. Type and Sub-Type define
+ ///< type of data. Size of data is included in Length.
+
} EFI_DEVICE_PATH_PROTOCOL;
///