2 Execute Disable feature.
4 Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
15 #include "CpuCommonFeatures.h"
18 Detects if Execute Disable feature supported on current processor.
20 @param[in] ProcessorNumber The index of the CPU executing this function.
21 @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
22 structure for the CPU executing this function.
23 @param[in] ConfigData A pointer to the configuration buffer returned
24 by CPU_FEATURE_GET_CONFIG_DATA. NULL if
25 CPU_FEATURE_GET_CONFIG_DATA was not provided in
28 @retval TRUE Execute Disable feature is supported.
29 @retval FALSE Execute Disable feature is not supported.
31 @note This service could be called by BSP/APs.
35 ExecuteDisableSupport (
36 IN UINTN ProcessorNumber
,
37 IN REGISTER_CPU_FEATURE_INFORMATION
*CpuInfo
,
38 IN VOID
*ConfigData OPTIONAL
42 CPUID_EXTENDED_CPU_SIG_EDX Edx
;
44 AsmCpuid (CPUID_EXTENDED_FUNCTION
, &Eax
, NULL
, NULL
, NULL
);
45 if (Eax
<= CPUID_EXTENDED_FUNCTION
) {
47 // Extended CPUID functions are not supported on this processor.
52 AsmCpuid (CPUID_EXTENDED_CPU_SIG
, NULL
, NULL
, NULL
, &Edx
.Uint32
);
53 return (Edx
.Bits
.NX
!= 0);
57 Initializes Execute Disable feature to specific state.
59 @param[in] ProcessorNumber The index of the CPU executing this function.
60 @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
61 structure for the CPU executing this function.
62 @param[in] ConfigData A pointer to the configuration buffer returned
63 by CPU_FEATURE_GET_CONFIG_DATA. NULL if
64 CPU_FEATURE_GET_CONFIG_DATA was not provided in
66 @param[in] State If TRUE, then the Execute Disable feature must be enabled.
67 If FALSE, then the Execute Disable feature must be disabled.
69 @retval RETURN_SUCCESS Execute Disable feature is initialized.
71 @note This service could be called by BSP only.
75 ExecuteDisableInitialize (
76 IN UINTN ProcessorNumber
,
77 IN REGISTER_CPU_FEATURE_INFORMATION
*CpuInfo
,
78 IN VOID
*ConfigData
, OPTIONAL
82 CPU_REGISTER_TABLE_WRITE_FIELD (
86 MSR_IA32_EFER_REGISTER
,
90 return RETURN_SUCCESS
;