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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
642 B
ArmAsm
31 lines
642 B
ArmAsm
#------------------------------------------------------------------------------
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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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.text
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.p2align 2
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GCC_ASM_EXPORT(ArmReadIdAA64Isar0Reg)
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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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ASM_PFX(ArmReadIdAA64Isar0Reg):
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AARCH64_BTI(c)
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mrs x0, id_aa64isar0_el1
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ret
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