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1 | #------------------------------------------------------------------------------\r | |
2 | #\r | |
3 | # ArmRndr() for AArch64\r | |
4 | #\r | |
5 | # Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>\r | |
6 | #\r | |
7 | # SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
8 | #\r | |
9 | #------------------------------------------------------------------------------\r | |
10 | \r | |
11 | #include "BaseRngLibInternals.h"\r | |
12 | \r | |
13 | .text\r | |
14 | .p2align 2\r | |
15 | GCC_ASM_EXPORT(ArmRndr)\r | |
16 | \r | |
17 | #/**\r | |
18 | # Generates a random number using RNDR.\r | |
19 | # Returns TRUE on success; FALSE on failure.\r | |
20 | #\r | |
21 | # @param[out] Rand Buffer pointer to store the 64-bit random value.\r | |
22 | #\r | |
23 | # @retval TRUE Random number generated successfully.\r | |
24 | # @retval FALSE Failed to generate the random number.\r | |
25 | #\r | |
26 | #**/\r | |
27 | #BOOLEAN\r | |
28 | #EFIAPI\r | |
29 | #ArmRndr (\r | |
30 | # OUT UINT64 *Rand\r | |
31 | # );\r | |
32 | #\r | |
33 | ASM_PFX(ArmRndr):\r | |
34 | mrs x1, RNDR\r | |
35 | str x1, [x0]\r | |
36 | cset x0, ne // RNDR sets NZCV to 0b0100 on failure\r | |
37 | ret\r |