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To enable AARCH64 native instruction support for Openssl, some interfaces must be implemented. OPENSSL_cpuid_setup() allows to probe the supported features of the platform. Add ArmReadIdAA64Isar0Reg() to read the AA64Isar0, containing Arm64 instruction capabilities. A similar ArmReadIdAA64Isar0() function is available in the ArmPkg, but the CryptoPkg where OPENSSL_cpuid_setup will reside cannot rely on the ArmPkg. Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
31 lines
637 B
NASM
31 lines
637 B
NASM
;------------------------------------------------------------------------------
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;
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; ArmReadIdAA64Isar0Reg() for AArch64
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;
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; Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
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;
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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;------------------------------------------------------------------------------
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EXPORT ArmReadIdAA64Isar0Reg
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AREA BaseLib_LowLevel, CODE, READONLY
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;/**
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; Reads the ID_AA64ISAR0 Register.
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;
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; @return The contents of the ID_AA64ISAR0 register.
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;
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;**/
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;UINT64
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;EFIAPI
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;ArmReadIdAA64Isar0Reg (
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; VOID
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; );
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;
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ArmReadIdAA64Isar0Reg
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mrs x0, id_aa64isar0_el1
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ret
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END
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