MdePkg: Centralize RNDR Register Definition

RNDR is a standard register defined in the ARM ARM for
AARCH64. Move the definition from BaseRngLib to AArch64.h.

Furthermore, move the inclusion of this register definition
to the ARM specific header file.

Signed-off-by: Oliver Smith-Denny <osde@microsoft.com>

MdePkg/Include/AArch64/AArch64.h

@@ -130,6 +130,10 @@
 // build for ARMv8.0, we need to define the register here.
 #define ID_AA64MMFR2_EL1  S3_0_C0_C7_2
 
+// The RNDR register is not recognized by older assemblers,
+// so we need to define it here
+#define RNDR  S3_3_C2_C4_0
+
 #define VECTOR_BASE(tbl)          \
   .section .text.##tbl##,"ax";    \
   .align 11;                      \

MdePkg/Library/BaseRngLib/AArch64/ArmRng.S

@@ -8,7 +8,7 @@
 #
 #------------------------------------------------------------------------------
 
-#include "BaseRngLibInternals.h"
+#include "ArmRng.h"
 
 .text
 .p2align 2

MdePkg/Library/BaseRngLib/AArch64/ArmRng.asm

@@ -8,7 +8,7 @@
 ;
 ;------------------------------------------------------------------------------
 
-#include "BaseRngLibInternals.h"
+#include "ArmRng.h"
 
   EXPORT ArmRndr
   AREA BaseLib_LowLevel, CODE, READONLY

MdePkg/Library/BaseRngLib/AArch64/ArmRng.h

@@ -11,6 +11,8 @@
 #ifndef ARM_RNG_H_
 #define ARM_RNG_H_
 
+#include <AArch64/AArch64.h>
+
 /**
   Generates a random number using RNDR.
   Returns TRUE on success; FALSE on failure.

MdePkg/Library/BaseRngLib/BaseRngLibInternals.h

@@ -69,11 +69,4 @@ ArchIsRngSupported (
   VOID
   );
 
-#if defined (MDE_CPU_AARCH64)
-
-// RNDR, Random Number
-#define RNDR  S3_3_C2_C4_0
-
-#endif
-
 #endif // BASE_RNGLIB_INTERNALS_H_