9301e5644c
Make BaseRngLib more generic by moving x86-specific functionality into 'Rand' and adding files under 'AArch64' to support the optional ARMv8.5 RNG instruction RNDR that is a part of FEAT_RNG. Signed-off-by: Rebecca Cran <rebecca@nuviainc.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
38 lines
879 B
ArmAsm
38 lines
879 B
ArmAsm
#------------------------------------------------------------------------------
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#
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# ArmRndr() 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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#include "BaseRngLibInternals.h"
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.text
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.p2align 2
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GCC_ASM_EXPORT(ArmRndr)
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#/**
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# Generates a random number using RNDR.
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# Returns TRUE on success; FALSE on failure.
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#
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# @param[out] Rand Buffer pointer to store the 64-bit random value.
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#
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# @retval TRUE Random number generated successfully.
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# @retval FALSE Failed to generate the random number.
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#
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#**/
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#BOOLEAN
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#EFIAPI
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#ArmRndr (
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# OUT UINT64 *Rand
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# );
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#
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ASM_PFX(ArmRndr):
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mrs x1, RNDR
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str x1, [x0]
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cset x0, ne // RNDR sets NZCV to 0b0100 on failure
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ret
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