projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| a1f22614 BS |
1 | /** @file\r |
| 2 | \r | |
| 3 | Secure Encrypted Virtualization (SEV) library helper function\r | |
| 4 | \r | |
| 5 | Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r | |
| 6 | \r | |
| 7 | This program and the accompanying materials\r | |
| 8 | are licensed and made available under the terms and conditions of the BSD\r | |
| 9 | License which accompanies this distribution. The full text of the license may\r | |
| 10 | be found at http://opensource.org/licenses/bsd-license.php\r | |
| 11 | \r | |
| 12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 14 | \r | |
| 15 | **/\r | |
| 16 | \r | |
| 17 | #include <Library/BaseLib.h>\r | |
| 18 | #include <Library/DebugLib.h>\r | |
| 19 | #include <Register/Cpuid.h>\r | |
| 20 | #include <Register/Amd/Cpuid.h>\r | |
| 21 | #include <Register/Amd/Msr.h>\r | |
| 22 | #include <Library/MemEncryptSevLib.h>\r | |
| 23 | \r | |
| 24 | STATIC BOOLEAN mSevStatus = FALSE;\r | |
| 25 | STATIC BOOLEAN mSevStatusChecked = FALSE;\r | |
| 26 | \r | |
| 27 | /**\r | |
| 28 | \r | |
| 29 | Returns a boolean to indicate whether SEV is enabled\r | |
| 30 | \r | |
| 31 | @retval TRUE SEV is enabled\r | |
| 32 | @retval FALSE SEV is not enabled\r | |
| 33 | **/\r | |
| 34 | STATIC\r | |
| 35 | BOOLEAN\r | |
| 36 | EFIAPI\r | |
| 37 | InternalMemEncryptSevIsEnabled (\r | |
| 38 | VOID\r | |
| 39 | )\r | |
| 40 | {\r | |
| 41 | UINT32 RegEax;\r | |
| 42 | MSR_SEV_STATUS_REGISTER Msr;\r | |
| 43 | CPUID_MEMORY_ENCRYPTION_INFO_EAX Eax;\r | |
| 44 | \r | |
| 45 | //\r | |
| 46 | // Check if memory encryption leaf exist\r | |
| 47 | //\r | |
| 48 | AsmCpuid (CPUID_EXTENDED_FUNCTION, &RegEax, NULL, NULL, NULL);\r | |
| 49 | if (RegEax >= CPUID_MEMORY_ENCRYPTION_INFO) {\r | |
| 50 | //\r | |
| 51 | // CPUID Fn8000_001F[EAX] Bit 1 (Sev supported)\r | |
| 52 | //\r | |
| 53 | AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, &Eax.Uint32, NULL, NULL, NULL);\r | |
| 54 | \r | |
| 55 | if (Eax.Bits.SevBit) {\r | |
| 56 | //\r | |
| 57 | // Check MSR_0xC0010131 Bit 0 (Sev Enabled)\r | |
| 58 | //\r | |
| 59 | Msr.Uint32 = AsmReadMsr32 (MSR_SEV_STATUS);\r | |
| 60 | if (Msr.Bits.SevBit) {\r | |
| 61 | return TRUE;\r | |
| 62 | }\r | |
| 63 | }\r | |
| 64 | }\r | |
| 65 | \r | |
| 66 | return FALSE;\r | |
| 67 | }\r | |
| 68 | \r | |
| 69 | /**\r | |
| 70 | \r | |
| 71 | Returns a boolean to indicate whether SEV is enabled\r | |
| 72 | \r | |
| 73 | @retval TRUE SEV is enabled\r | |
| 74 | @retval FALSE SEV is not enabled\r | |
| 75 | **/\r | |
| 76 | BOOLEAN\r | |
| 77 | EFIAPI\r | |
| 78 | MemEncryptSevIsEnabled (\r | |
| 79 | VOID\r | |
| 80 | )\r | |
| 81 | {\r | |
| 82 | if (mSevStatusChecked) {\r | |
| 83 | return mSevStatus;\r | |
| 84 | }\r | |
| 85 | \r | |
| 86 | mSevStatus = InternalMemEncryptSevIsEnabled();\r | |
| 87 | mSevStatusChecked = TRUE;\r | |
| 88 | \r | |
| 89 | return mSevStatus;\r | |
| 90 | }\r |