1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
#------------------------------------------------------------------------------
#
# ArmRndr() for AArch64
#
# Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
#------------------------------------------------------------------------------
#include "ArmRng.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
|
