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1 | /** @file |
2 | LimitCpuidMaxval Feature. | |
3 | ||
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 | |
9 | ||
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. | |
12 | ||
13 | **/ | |
14 | ||
15 | #include "CpuCommonFeatures.h" | |
16 | ||
17 | /** | |
18 | Detects if LimitCpuidMaxval feature supported on current processor. | |
19 | ||
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 | |
26 | RegisterCpuFeature(). | |
27 | ||
28 | @retval TRUE LimitCpuidMaxval feature is supported. | |
29 | @retval FALSE LimitCpuidMaxval feature is not supported. | |
30 | ||
31 | @note This service could be called by BSP/APs. | |
32 | **/ | |
33 | BOOLEAN | |
34 | EFIAPI | |
35 | LimitCpuidMaxvalSupport ( | |
36 | IN UINTN ProcessorNumber, | |
37 | IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo, | |
38 | IN VOID *ConfigData OPTIONAL | |
39 | ) | |
40 | { | |
41 | UINT32 Eax; | |
42 | ||
43 | AsmCpuid (CPUID_SIGNATURE, &Eax, NULL, NULL, NULL); | |
44 | return (Eax > 3); | |
45 | } | |
46 | ||
47 | /** | |
48 | Initializes LimitCpuidMaxval feature to specific state. | |
49 | ||
50 | @param[in] ProcessorNumber The index of the CPU executing this function. | |
51 | @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION | |
52 | structure for the CPU executing this function. | |
53 | @param[in] ConfigData A pointer to the configuration buffer returned | |
54 | by CPU_FEATURE_GET_CONFIG_DATA. NULL if | |
55 | CPU_FEATURE_GET_CONFIG_DATA was not provided in | |
56 | RegisterCpuFeature(). | |
57 | @param[in] State If TRUE, then the LimitCpuidMaxval feature must be enabled. | |
58 | If FALSE, then the LimitCpuidMaxval feature must be disabled. | |
59 | ||
60 | @retval RETURN_SUCCESS LimitCpuidMaxval feature is initialized. | |
61 | ||
62 | @note This service could be called by BSP only. | |
63 | **/ | |
64 | RETURN_STATUS | |
65 | EFIAPI | |
66 | LimitCpuidMaxvalInitialize ( | |
67 | IN UINTN ProcessorNumber, | |
68 | IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo, | |
69 | IN VOID *ConfigData, OPTIONAL | |
70 | IN BOOLEAN State | |
71 | ) | |
72 | { | |
73 | CPU_REGISTER_TABLE_WRITE_FIELD ( | |
74 | ProcessorNumber, | |
75 | Msr, | |
76 | MSR_IA32_MISC_ENABLE, | |
77 | MSR_IA32_MISC_ENABLE_REGISTER, | |
78 | Bits.LimitCpuidMaxval, | |
79 | (State) ? 1 : 0 | |
80 | ); | |
81 | return RETURN_SUCCESS; | |
82 | } |