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>
40 lines
895 B
NASM
40 lines
895 B
NASM
;------------------------------------------------------------------------------
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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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EXPORT ArmRndr
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AREA BaseLib_LowLevel, CODE, READONLY
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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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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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END
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