MdePkg: Add Reset2 ppi definition.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17388 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Include/Uefi/UefiMultiPhase.h

@@ -90,6 +90,39 @@ typedef enum {
   EfiMaxMemoryType
 } EFI_MEMORY_TYPE;
 
+///
+/// Enumeration of reset types.
+///
+typedef enum {
+  ///
+  /// Used to induce a system-wide reset. This sets all circuitry within the
+  /// system to its initial state.  This type of reset is asynchronous to system
+  /// operation and operates withgout regard to cycle boundaries.  EfiColdReset
+  /// is tantamount to a system power cycle.
+  ///
+  EfiResetCold,
+  ///
+  /// Used to induce a system-wide initialization. The processors are set to their
+  /// initial state, and pending cycles are not corrupted.  If the system does
+  /// not support this reset type, then an EfiResetCold must be performed.
+  ///
+  EfiResetWarm,
+  ///
+  /// Used to induce an entry into a power state equivalent to the ACPI G2/S5 or G3
+  /// state.  If the system does not support this reset type, then when the system
+  /// is rebooted, it should exhibit the EfiResetCold attributes.
+  ///
+  EfiResetShutdown,
+  ///
+  /// Used to induce a system-wide reset. The exact type of the reset is defined by
+  /// the EFI_GUID that follows the Null-terminated Unicode string passed into
+  /// ResetData. If the platform does not recognize the EFI_GUID in ResetData the
+  /// platform must pick a supported reset type to perform. The platform may
+  /// optionally log the parameters from any non-normal reset that occurs.
+  ///
+  EfiResetPlatformSpecific
+} EFI_RESET_TYPE;
+
 ///
 /// Data structure that precedes all of the standard EFI table types.
 ///