Add comments for Tcg Platform protocol.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5040 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Include/Protocol/TcgPlatform.h

@@ -24,6 +24,24 @@ typedef struct tdEFI_TCG_PLATFORM_PROTOCOL EFI_TCG_PLATFORM_PROTOCOL;
 //
 // EFI TCG Platform Protocol
 //
+/**
+  
+  Measure PE/COFF Image File prior to the application of any fix-ups or relocations.
+  
+  @param  BootPolicy      If TRUE, indicates that the request originates from the boot manager,
+                          and that the boot manager is attempting to load FilePath as a boot selection.
+  @param  ImageAddress    The memory address to PE/COFF image.
+  @param  ImageSize       The size of PE/COFF image.
+  @param  LinkTimeBase    The image base address in the original PeImage.
+  @param  ImageType       The subsystem type of the PeImage.
+  @param  DeviceHandle    The handle to device matched the file path. 
+  @param  FilePath        The specific file path from which the image is loaded.
+  
+  @retval EFI_SUCCESS           Measure successfully.
+  @retval EFI_UNSUPPORTED       The loaded PeImage is not supported.
+  @retval EFI_OUT_OF_RESOURCES  The resource of memory is not enough.
+
+**/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_TCG_MEASURE_PE_IMAGE) (
@@ -36,6 +54,15 @@ EFI_STATUS
   IN      EFI_DEVICE_PATH_PROTOCOL  *FilePath
   );
 
+/**
+  
+  Measure efi action string.
+  
+  @param  ActionString  Pointer to action string.
+  
+  @retval EFI_SUCCESS   Measure action string successfully.
+
+**/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_TCG_MEASURE_ACTION) (