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1 | /** @file\r |
2 | LimitCpuidMaxval Feature.\r | |
3 | \r | |
60cb4d1b | 4 | Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>\r |
80c4b236 JF |
5 | This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include "CpuCommonFeatures.h"\r | |
16 | \r | |
17 | /**\r | |
18 | Detects if LimitCpuidMaxval feature supported on current processor.\r | |
19 | \r | |
20 | @param[in] ProcessorNumber The index of the CPU executing this function.\r | |
21 | @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION\r | |
22 | structure for the CPU executing this function.\r | |
23 | @param[in] ConfigData A pointer to the configuration buffer returned\r | |
24 | by CPU_FEATURE_GET_CONFIG_DATA. NULL if\r | |
25 | CPU_FEATURE_GET_CONFIG_DATA was not provided in\r | |
26 | RegisterCpuFeature().\r | |
27 | \r | |
28 | @retval TRUE LimitCpuidMaxval feature is supported.\r | |
29 | @retval FALSE LimitCpuidMaxval feature is not supported.\r | |
30 | \r | |
31 | @note This service could be called by BSP/APs.\r | |
32 | **/\r | |
33 | BOOLEAN\r | |
34 | EFIAPI\r | |
35 | LimitCpuidMaxvalSupport (\r | |
36 | IN UINTN ProcessorNumber,\r | |
37 | IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,\r | |
38 | IN VOID *ConfigData OPTIONAL\r | |
39 | )\r | |
40 | {\r | |
41 | UINT32 Eax;\r | |
42 | \r | |
43 | AsmCpuid (CPUID_SIGNATURE, &Eax, NULL, NULL, NULL);\r | |
60cb4d1b | 44 | return (Eax > 2);\r |
80c4b236 JF |
45 | }\r |
46 | \r | |
47 | /**\r | |
48 | Initializes LimitCpuidMaxval feature to specific state.\r | |
49 | \r | |
50 | @param[in] ProcessorNumber The index of the CPU executing this function.\r | |
51 | @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION\r | |
52 | structure for the CPU executing this function.\r | |
53 | @param[in] ConfigData A pointer to the configuration buffer returned\r | |
54 | by CPU_FEATURE_GET_CONFIG_DATA. NULL if\r | |
55 | CPU_FEATURE_GET_CONFIG_DATA was not provided in\r | |
56 | RegisterCpuFeature().\r | |
57 | @param[in] State If TRUE, then the LimitCpuidMaxval feature must be enabled.\r | |
58 | If FALSE, then the LimitCpuidMaxval feature must be disabled.\r | |
59 | \r | |
60 | @retval RETURN_SUCCESS LimitCpuidMaxval feature is initialized.\r | |
61 | \r | |
62 | @note This service could be called by BSP only.\r | |
63 | **/\r | |
64 | RETURN_STATUS\r | |
65 | EFIAPI\r | |
66 | LimitCpuidMaxvalInitialize (\r | |
67 | IN UINTN ProcessorNumber,\r | |
68 | IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,\r | |
69 | IN VOID *ConfigData, OPTIONAL\r | |
70 | IN BOOLEAN State\r | |
71 | )\r | |
72 | {\r | |
73 | CPU_REGISTER_TABLE_WRITE_FIELD (\r | |
74 | ProcessorNumber,\r | |
75 | Msr,\r | |
76 | MSR_IA32_MISC_ENABLE,\r | |
77 | MSR_IA32_MISC_ENABLE_REGISTER,\r | |
78 | Bits.LimitCpuidMaxval,\r | |
79 | (State) ? 1 : 0\r | |
80 | );\r | |
81 | return RETURN_SUCCESS;\r | |
82 | }\r |