| #------------------------------------------------------------------------------ | |
| # | |
| # ArmRndr() for AArch64 | |
| # | |
| # Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR> | |
| # | |
| # SPDX-License-Identifier: BSD-2-Clause-Patent | |
| # | |
| #------------------------------------------------------------------------------ | |
| #include "BaseRngLibInternals.h" | |
| .text | |
| .p2align 2 | |
| GCC_ASM_EXPORT(ArmRndr) | |
| #/** | |
| # Generates a random number using RNDR. | |
| # Returns TRUE on success; FALSE on failure. | |
| # | |
| # @param[out] Rand Buffer pointer to store the 64-bit random value. | |
| # | |
| # @retval TRUE Random number generated successfully. | |
| # @retval FALSE Failed to generate the random number. | |
| # | |
| #**/ | |
| #BOOLEAN | |
| #EFIAPI | |
| #ArmRndr ( | |
| # OUT UINT64 *Rand | |
| # ); | |
| # | |
| ASM_PFX(ArmRndr): | |
| AARCH64_BTI(c) | |
| mrs x1, RNDR | |
| str x1, [x0] | |
| cset x0, ne // RNDR sets NZCV to 0b0100 on failure | |
| ret |