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
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
#------------------------------------------------------------------------------ ;
# Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php.
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
# Module Name:
#
# RdRand.S
#
# Abstract:
#
# Generates random number through CPU RdRand instruction under 64-bit platform.
#
# Notes:
#
#------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// Generates a 16 bit random number through RDRAND instruction.
// Return TRUE if Rand generated successfully, or FALSE if not.
//
// BOOLEAN EFIAPI InternalX86RdRand16 (UINT16 *Rand);
//------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(InternalX86RdRand16)
ASM_PFX(InternalX86RdRand16):
.byte 0x0f, 0xc7, 0xf0 // rdrand r16: "0f c7 /6 ModRM:r/m(w)"
jc rn16_ok // jmp if CF=1
xor %rax, %rax // reg=0 if CF=0
ret // return with failure status
rn16_ok:
mov %ax, (%rcx)
mov $0x1, %rax
ret
//------------------------------------------------------------------------------
// Generates a 32 bit random number through RDRAND instruction.
// Return TRUE if Rand generated successfully, or FALSE if not.
//
// BOOLEAN EFIAPI InternalX86RdRand32 (UINT32 *Rand);
//------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(InternalX86RdRand32)
ASM_PFX(InternalX86RdRand32):
.byte 0x0f, 0xc7, 0xf0 // rdrand r32: "0f c7 /6 ModRM:r/m(w)"
jc rn32_ok // jmp if CF=1
xor %rax, %rax // reg=0 if CF=0
ret // return with failure status
rn32_ok:
mov %eax, (%rcx)
mov $0x1, %rax
ret
//------------------------------------------------------------------------------
// Generates a 64 bit random number through RDRAND instruction.
// Return TRUE if Rand generated successfully, or FALSE if not.
//
// BOOLEAN EFIAPI InternalX86RdRand64 (UINT64 *Rand);
//------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(InternalX86RdRand64)
ASM_PFX(InternalX86RdRand64):
.byte 0x48, 0x0f, 0xc7, 0xf0 // rdrand r64: "REX.W + 0f c7 /6 ModRM:r/m(w)"
jc rn64_ok // jmp if CF=1
xor %rax, %rax // reg=0 if CF=0
ret // return with failure status
rn64_ok:
mov %rax, (%rcx)
mov $0x1, %rax
ret
|
