projects / mirror_edk2.git / blame
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1 | /**@file\r |
| 2 | Initialize Secure Encrypted Virtualization (SEV) support\r | |
| 3 | \r | |
| 4 | Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>\r | |
| 5 | \r | |
| 6 | This program and the accompanying materials\r | |
| 7 | are licensed and made available under the terms and conditions of the BSD\r | |
| 8 | License which accompanies this distribution. The full text of the license\r | |
| 9 | may be found at http://opensource.org/licenses/bsd-license.php\r | |
| 10 | \r | |
| 11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 13 | \r | |
| 14 | **/\r | |
| 15 | //\r | |
| 16 | // The package level header files this module uses\r | |
| 17 | //\r | |
| 18 | #include <PiPei.h>\r | |
| 19 | \r | |
| 20 | #include <Library/DebugLib.h>\r | |
| 21 | #include <Library/PcdLib.h>\r | |
| 22 | #include <Register/Cpuid.h>\r | |
| 23 | #include <Register/Amd/Cpuid.h>\r | |
| 24 | #include <Library/MemEncryptSevLib.h>\r | |
| 25 | \r | |
| c0d221a3 LE |
26 | #include "Platform.h"\r |
| 27 | \r | |
| 13b5d743 BS |
28 | /**\r |
| 29 | \r | |
| 30 | Function checks if SEV support is available, if present then it sets\r | |
| 31 | the dynamic PcdPteMemoryEncryptionAddressOrMask with memory encryption mask.\r | |
| 32 | \r | |
| 33 | **/\r | |
| 34 | VOID\r | |
| 13b5d743 BS |
35 | AmdSevInitialize (\r |
| 36 | VOID\r | |
| 37 | )\r | |
| 38 | {\r | |
| 39 | CPUID_MEMORY_ENCRYPTION_INFO_EBX Ebx;\r | |
| 40 | UINT64 EncryptionMask;\r | |
| 41 | RETURN_STATUS PcdStatus;\r | |
| 42 | \r | |
| 43 | //\r | |
| 44 | // Check if SEV is enabled\r | |
| 45 | //\r | |
| 46 | if (!MemEncryptSevIsEnabled ()) {\r | |
| 47 | return;\r | |
| 48 | }\r | |
| 49 | \r | |
| 50 | //\r | |
| 51 | // CPUID Fn8000_001F[EBX] Bit 0:5 (memory encryption bit position)\r | |
| 52 | //\r | |
| 53 | AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, NULL, &Ebx.Uint32, NULL, NULL);\r | |
| 54 | EncryptionMask = LShiftU64 (1, Ebx.Bits.PtePosBits);\r | |
| 55 | \r | |
| 56 | //\r | |
| 57 | // Set Memory Encryption Mask PCD\r | |
| 58 | //\r | |
| 59 | PcdStatus = PcdSet64S (PcdPteMemoryEncryptionAddressOrMask, EncryptionMask);\r | |
| 60 | ASSERT_RETURN_ERROR (PcdStatus);\r | |
| 61 | \r | |
| 62 | DEBUG ((DEBUG_INFO, "SEV is enabled (mask 0x%lx)\n", EncryptionMask));\r | |
| 6041ac65 BS |
63 | \r |
| 64 | //\r | |
| 65 | // Set Pcd to Deny the execution of option ROM when security\r | |
| 66 | // violation.\r | |
| 67 | //\r | |
| 68 | PcdStatus = PcdSet32S (PcdOptionRomImageVerificationPolicy, 0x4);\r | |
| 69 | ASSERT_RETURN_ERROR (PcdStatus);\r | |
| 13b5d743 | 70 | }\r |