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80c4b236 JF |
1 | /** @file\r |
2 | Execute Disable feature.\r | |
3 | \r | |
4 | Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>\r | |
0acd8697 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
80c4b236 JF |
6 | \r |
7 | **/\r | |
8 | \r | |
9 | #include "CpuCommonFeatures.h"\r | |
10 | \r | |
11 | /**\r | |
12 | Detects if Execute Disable feature supported on current processor.\r | |
13 | \r | |
14 | @param[in] ProcessorNumber The index of the CPU executing this function.\r | |
15 | @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION\r | |
16 | structure for the CPU executing this function.\r | |
17 | @param[in] ConfigData A pointer to the configuration buffer returned\r | |
18 | by CPU_FEATURE_GET_CONFIG_DATA. NULL if\r | |
19 | CPU_FEATURE_GET_CONFIG_DATA was not provided in\r | |
20 | RegisterCpuFeature().\r | |
21 | \r | |
22 | @retval TRUE Execute Disable feature is supported.\r | |
23 | @retval FALSE Execute Disable feature is not supported.\r | |
24 | \r | |
25 | @note This service could be called by BSP/APs.\r | |
26 | **/\r | |
27 | BOOLEAN\r | |
28 | EFIAPI\r | |
29 | ExecuteDisableSupport (\r | |
30 | IN UINTN ProcessorNumber,\r | |
31 | IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,\r | |
32 | IN VOID *ConfigData OPTIONAL\r | |
33 | )\r | |
34 | {\r | |
35 | UINT32 Eax;\r | |
36 | CPUID_EXTENDED_CPU_SIG_EDX Edx;\r | |
37 | \r | |
38 | AsmCpuid (CPUID_EXTENDED_FUNCTION, &Eax, NULL, NULL, NULL);\r | |
39 | if (Eax <= CPUID_EXTENDED_FUNCTION) {\r | |
40 | //\r | |
41 | // Extended CPUID functions are not supported on this processor.\r | |
42 | //\r | |
43 | return FALSE;\r | |
44 | }\r | |
45 | \r | |
46 | AsmCpuid (CPUID_EXTENDED_CPU_SIG, NULL, NULL, NULL, &Edx.Uint32);\r | |
47 | return (Edx.Bits.NX != 0);\r | |
48 | }\r | |
49 | \r | |
50 | /**\r | |
51 | Initializes Execute Disable feature to specific state.\r | |
52 | \r | |
53 | @param[in] ProcessorNumber The index of the CPU executing this function.\r | |
54 | @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION\r | |
55 | structure for the CPU executing this function.\r | |
56 | @param[in] ConfigData A pointer to the configuration buffer returned\r | |
57 | by CPU_FEATURE_GET_CONFIG_DATA. NULL if\r | |
58 | CPU_FEATURE_GET_CONFIG_DATA was not provided in\r | |
59 | RegisterCpuFeature().\r | |
60 | @param[in] State If TRUE, then the Execute Disable feature must be enabled.\r | |
61 | If FALSE, then the Execute Disable feature must be disabled.\r | |
62 | \r | |
63 | @retval RETURN_SUCCESS Execute Disable feature is initialized.\r | |
64 | \r | |
65 | @note This service could be called by BSP only.\r | |
66 | **/\r | |
67 | RETURN_STATUS\r | |
68 | EFIAPI\r | |
69 | ExecuteDisableInitialize (\r | |
70 | IN UINTN ProcessorNumber,\r | |
71 | IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,\r | |
72 | IN VOID *ConfigData, OPTIONAL\r | |
73 | IN BOOLEAN State\r | |
74 | )\r | |
75 | {\r | |
d28daadd ED |
76 | //\r |
77 | // The scope of the MSR_IA32_EFER is core for below processor type, only program\r | |
78 | // MSR_IA32_EFER for thread 0 in each core.\r | |
79 | //\r | |
80 | if (IS_SILVERMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel)) {\r | |
81 | if (CpuInfo->ProcessorInfo.Location.Thread != 0) {\r | |
82 | return RETURN_SUCCESS;\r | |
83 | }\r | |
84 | }\r | |
85 | \r | |
80c4b236 JF |
86 | CPU_REGISTER_TABLE_WRITE_FIELD (\r |
87 | ProcessorNumber,\r | |
88 | Msr,\r | |
89 | MSR_IA32_EFER,\r | |
90 | MSR_IA32_EFER_REGISTER,\r | |
91 | Bits.NXE,\r | |
92 | (State) ? 1 : 0\r | |
93 | );\r | |
94 | return RETURN_SUCCESS;\r | |
95 | }\r |