MdePkg/BaseRngLib: Prefer ArmReadIdAA64Isar0Reg() over ArmReadIdIsar0()

A ArmReadIdAA64Isar0Reg() function was recently added
to BaseLib. Use it instead of its ArmReadIdIsar0() equivalent,
which was private to the BaseRngLib library.

This also allows to avoid the confusion between the following
registers:
- ID_ISAR0_EL1: allows to probe for Divide instructions, Debug
  instructions, ...
- ID_AA64ISAR0_EL1: AARCH64 specific register allowing to probe
  for AESE, RNDR, ... instructions

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>

1 files changed, 0 insertions, 30 deletions

diff --git a/MdePkg/Library/BaseRngLib/AArch64/ArmReadIdIsar0.asm b/MdePkg/Library/BaseRngLib/AArch64/ArmReadIdIsar0.asm
deleted file mode 100644
index 1d9f9a808c..0000000000
--- a/MdePkg/Library/BaseRngLib/AArch64/ArmReadIdIsar0.asm
+++ /dev/null
@@ -1,30 +0,0 @@
-;------------------------------------------------------------------------------

-;

-; ArmReadIdIsar0() for AArch64

-;

-; Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>

-;

-; SPDX-License-Identifier: BSD-2-Clause-Patent

-;

-;------------------------------------------------------------------------------

-

-  EXPORT ArmReadIdIsar0

-  AREA BaseLib_LowLevel, CODE, READONLY

-

-;/**

-;  Reads the ID_AA64ISAR0 Register.

-;

-; @return The contents of the ID_AA64ISAR0 register.

-;

-;**/

-;UINT64

-;EFIAPI

-;ArmReadIdIsar0 (

-;  VOID

-;  );

-;

-ArmReadIdIsar0

-  mrs  x0, id_aa64isar0_el1 // Read ID_AA64ISAR0 Register

-  ret

-

-  END