MdePkg: Add CPU RdRand access APIs for random number generation

Add AsmRdRand16/32/64 APIs for RdRand instruction access to generate
high-quality random number.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qin Long <qin.long@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18518 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Include/Library/BaseLib.h

@@ -7647,6 +7647,57 @@ AsmPrepareAndThunk16 (
   IN OUT  THUNK_CONTEXT             *ThunkContext
   );
 
+/**
+  Generates a 16-bit random number through RDRAND instruction.
+
+  if Rand is NULL, then ASSERT().
+
+  @param[out]  Rand     Buffer pointer to store the random result.
+
+  @retval TRUE          RDRAND call was successful.
+  @retval FALSE         Failed attempts to call RDRAND.
+
+ **/
+BOOLEAN
+EFIAPI
+AsmRdRand16 (
+  OUT     UINT16                    *Rand
+  );
+
+/**
+  Generates a 32-bit random number through RDRAND instruction.
+
+  if Rand is NULL, then ASSERT().
+
+  @param[out]  Rand     Buffer pointer to store the random result.
+
+  @retval TRUE          RDRAND call was successful.
+  @retval FALSE         Failed attempts to call RDRAND.
+
+**/
+BOOLEAN
+EFIAPI
+AsmRdRand32 (
+  OUT     UINT32                    *Rand
+  );
+
+/**
+  Generates a 64-bit random number through RDRAND instruction.
+
+  if Rand is NULL, then ASSERT().
+
+  @param[out]  Rand     Buffer pointer to store the random result.
+
+  @retval TRUE          RDRAND call was successful.
+  @retval FALSE         Failed attempts to call RDRAND.
+
+**/
+BOOLEAN
+EFIAPI
+AsmRdRand64  (
+  OUT     UINT64                    *Rand
+  );
+
 #endif
 #endif