Revision: 17390
http://sourceforge.net/p/edk2/code/17390
Author: niruiyu
Date: 2015-05-11 02:24:30 +0000 (Mon, 11 May 2015)
Log Message:
-----------
MdePkg: Add EFI_LOAD_OPTION definition.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <[email protected]>
Reviewed-by: Liming Gao <[email protected]>
Reviewed-by: Felix Poludov <[email protected]>
Reviewed-by: Kinney Michael <[email protected]>
Modified Paths:
--------------
trunk/edk2/MdePkg/Include/Uefi/UefiSpec.h
Modified: trunk/edk2/MdePkg/Include/Uefi/UefiSpec.h
===================================================================
--- trunk/edk2/MdePkg/Include/Uefi/UefiSpec.h 2015-05-11 02:06:51 UTC (rev
17389)
+++ trunk/edk2/MdePkg/Include/Uefi/UefiSpec.h 2015-05-11 02:24:30 UTC (rev
17390)
@@ -2001,6 +2001,55 @@
);
//
+// EFI Load Option. This data structure describes format of UEFI boot option
variables.
+//
+// NOTE: EFI Load Option is a byte packed buffer of variable length fields.
+// The first two fields have fixed length. They are declared as members of the
+// EFI_LOAD_OPTION structure. All the other fields are variable length fields.
+// They are listed in the comment block below for reference purposes.
+//
+#pragma pack(1)
+typedef struct _EFI_LOAD_OPTION {
+ ///
+ /// The attributes for this load option entry. All unused bits must be zero
+ /// and are reserved by the UEFI specification for future growth.
+ ///
+ UINT32 Attributes;
+ ///
+ /// Length in bytes of the FilePathList. OptionalData starts at offset
+ /// sizeof(UINT32) + sizeof(UINT16) + StrSize(Description) +
FilePathListLength
+ /// of the EFI_LOAD_OPTION descriptor.
+ ///
+ UINT16 FilePathListLength;
+ ///
+ /// The user readable description for the load option.
+ /// This field ends with a Null character.
+ ///
+ // CHAR16 Description[];
+ ///
+ /// A packed array of UEFI device paths. The first element of the array is a
+ /// device path that describes the device and location of the Image for this
+ /// load option. The FilePathList[0] is specific to the device type. Other
+ /// device paths may optionally exist in the FilePathList, but their usage is
+ /// OSV specific. Each element in the array is variable length, and ends at
+ /// the device path end structure. Because the size of Description is
+ /// arbitrary, this data structure is not guaranteed to be aligned on a
+ /// natural boundary. This data structure may have to be copied to an aligned
+ /// natural boundary before it is used.
+ ///
+ // EFI_DEVICE_PATH_PROTOCOL FilePathList[];
+ ///
+ /// The remaining bytes in the load option descriptor are a binary data
buffer
+ /// that is passed to the loaded image. If the field is zero bytes long, a
+ /// NULL pointer is passed to the loaded image. The number of bytes in
+ /// OptionalData can be computed by subtracting the starting offset of
+ /// OptionalData from total size in bytes of the EFI_LOAD_OPTION.
+ ///
+ // UINT8 OptionalData[];
+} EFI_LOAD_OPTION;
+#pragma pack()
+
+//
// EFI Load Options Attributes
//
#define LOAD_OPTION_ACTIVE 0x00000001
------------------------------------------------------------------------------
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