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To enable AARCH64 native instruction support for Openssl, some interfaces must be implemented. OPENSSL_rdtsc() requests an access to a counter to get some non-trusted entropy. Add ArmReadCntPctReg() to read system count. A similar ArmReadCntPct() function is available in the ArmPkg, but the CryptoPkg where OPENSSL_rdtsc will reside cannot rely on the ArmPkg. Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
31 lines
617 B
NASM
31 lines
617 B
NASM
;------------------------------------------------------------------------------
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;
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; ArmReadCntPctReg() for AArch64
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;
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; Copyright (c) 2023 - 2024, Arm Limited. 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 ArmReadCntPctReg
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AREA BaseLib_LowLevel, CODE, READONLY
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;/**
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; Reads the CNTPCT_EL0 Register.
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;
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; @return The contents of the CNTPCT_EL0 register.
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;
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;**/
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;UINT64
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;EFIAPI
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;ArmReadCntPctReg (
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; VOID
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; );
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;
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ArmReadCntPctReg
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mrs x0, cntpct_el0
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ret
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END
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