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
|
/** @file
Copyright (c) 2020-2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Register/Intel/Cpuid.h>
/**
Probe if TD is enabled.
@return TRUE TD is enabled.
@return FALSE TD is not enabled.
**/
BOOLEAN
EFIAPI
TdIsEnabled (
)
{
UINT32 Eax;
UINT32 Ebx;
UINT32 Ecx;
UINT32 Edx;
UINT32 LargestEax;
BOOLEAN TdEnabled;
CPUID_VERSION_INFO_ECX CpuIdVersionInfoEcx;
TdEnabled = FALSE;
do {
AsmCpuid (CPUID_SIGNATURE, &LargestEax, &Ebx, &Ecx, &Edx);
if ( (Ebx != CPUID_SIGNATURE_GENUINE_INTEL_EBX)
|| (Edx != CPUID_SIGNATURE_GENUINE_INTEL_EDX)
|| (Ecx != CPUID_SIGNATURE_GENUINE_INTEL_ECX))
{
break;
}
AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, &CpuIdVersionInfoEcx.Uint32, NULL);
if (CpuIdVersionInfoEcx.Bits.ParaVirtualized == 0) {
break;
}
if (LargestEax < CPUID_GUESTTD_RUNTIME_ENVIRONMENT) {
break;
}
AsmCpuidEx (CPUID_GUESTTD_RUNTIME_ENVIRONMENT, 0, &Eax, &Ebx, &Ecx, &Edx);
if ( (Ebx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_EBX)
|| (Edx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_EDX)
|| (Ecx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_ECX))
{
break;
}
TdEnabled = TRUE;
} while (FALSE);
return TdEnabled;
}
|
