projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 61bacc0f TL |
1 | /** @file\r |
| 2 | X64 #VC Exception Handler functon.\r | |
| 3 | \r | |
| 4 | Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>\r | |
| 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
| 6 | \r | |
| 7 | **/\r | |
| 8 | \r | |
| 9 | #include <Base.h>\r | |
| 10 | #include <Uefi.h>\r | |
| 11 | #include <Library/BaseMemoryLib.h>\r | |
| 12 | #include <Library/VmgExitLib.h>\r | |
| 13 | #include <Register/Amd/Msr.h>\r | |
| 14 | \r | |
| 15 | /**\r | |
| 16 | Handle a #VC exception.\r | |
| 17 | \r | |
| 18 | Performs the necessary processing to handle a #VC exception.\r | |
| 19 | \r | |
| 20 | @param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set\r | |
| 21 | as value to use on error.\r | |
| 22 | @param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT\r | |
| 23 | \r | |
| 24 | @retval EFI_SUCCESS Exception handled\r | |
| 25 | @retval EFI_UNSUPPORTED #VC not supported, (new) exception value to\r | |
| 26 | propagate provided\r | |
| 27 | @retval EFI_PROTOCOL_ERROR #VC handling failed, (new) exception value to\r | |
| 28 | propagate provided\r | |
| 29 | \r | |
| 30 | **/\r | |
| 31 | EFI_STATUS\r | |
| 32 | EFIAPI\r | |
| 33 | VmgExitHandleVc (\r | |
| 34 | IN OUT EFI_EXCEPTION_TYPE *ExceptionType,\r | |
| 35 | IN OUT EFI_SYSTEM_CONTEXT SystemContext\r | |
| 36 | )\r | |
| 37 | {\r | |
| 38 | MSR_SEV_ES_GHCB_REGISTER Msr;\r | |
| 39 | EFI_SYSTEM_CONTEXT_X64 *Regs;\r | |
| 40 | GHCB *Ghcb;\r | |
| 41 | UINT64 ExitCode, Status;\r | |
| 42 | EFI_STATUS VcRet;\r | |
| 43 | \r | |
| 44 | VcRet = EFI_SUCCESS;\r | |
| 45 | \r | |
| 46 | Msr.GhcbPhysicalAddress = AsmReadMsr64 (MSR_SEV_ES_GHCB);\r | |
| 47 | ASSERT (Msr.GhcbInfo.Function == 0);\r | |
| 48 | ASSERT (Msr.Ghcb != 0);\r | |
| 49 | \r | |
| 50 | Regs = SystemContext.SystemContextX64;\r | |
| 51 | Ghcb = Msr.Ghcb;\r | |
| 52 | \r | |
| 53 | VmgInit (Ghcb);\r | |
| 54 | \r | |
| 55 | ExitCode = Regs->ExceptionData;\r | |
| 56 | switch (ExitCode) {\r | |
| 57 | default:\r | |
| 58 | Status = VmgExit (Ghcb, SVM_EXIT_UNSUPPORTED, ExitCode, 0);\r | |
| 59 | if (Status == 0) {\r | |
| 60 | Regs->ExceptionData = 0;\r | |
| 61 | *ExceptionType = GP_EXCEPTION;\r | |
| 62 | } else {\r | |
| 63 | GHCB_EVENT_INJECTION Event;\r | |
| 64 | \r | |
| 65 | Event.Uint64 = Status;\r | |
| 66 | if (Event.Elements.ErrorCodeValid != 0) {\r | |
| 67 | Regs->ExceptionData = Event.Elements.ErrorCode;\r | |
| 68 | } else {\r | |
| 69 | Regs->ExceptionData = 0;\r | |
| 70 | }\r | |
| 71 | \r | |
| 72 | *ExceptionType = Event.Elements.Vector;\r | |
| 73 | }\r | |
| 74 | \r | |
| 75 | VcRet = EFI_PROTOCOL_ERROR;\r | |
| 76 | }\r | |
| 77 | \r | |
| 78 | VmgDone (Ghcb);\r | |
| 79 | \r | |
| 80 | return VcRet;\r | |
| 81 | }\r |