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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
622 B
ArmAsm
31 lines
622 B
ArmAsm
#------------------------------------------------------------------------------
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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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.text
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.p2align 2
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GCC_ASM_EXPORT(ArmReadCntPctReg)
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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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ASM_PFX(ArmReadCntPctReg):
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AARCH64_BTI(c)
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mrs x0, cntpct_el0
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ret
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