projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| f496443e AP |
1 | /** @file\r |
| 2 | Get information about Xen\r | |
| 3 | \r | |
| 4 | This library simply allow to find out if OVMF is running under Xen and\r | |
| 5 | allow to get more information when it is the case.\r | |
| 6 | \r | |
| 7 | Copyright (c) 2019, Citrix Systems, Inc.\r | |
| 8 | \r | |
| 9 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
| 10 | \r | |
| 11 | **/\r | |
| 12 | \r | |
| 13 | #include <PiDxe.h>\r | |
| 14 | #include <Library/HobLib.h>\r | |
| 15 | #include <Library/XenPlatformLib.h>\r | |
| 16 | \r | |
| 17 | /**\r | |
| 18 | This function return a pointer to the XenInfo HOB.\r | |
| 19 | \r | |
| 20 | @return XenInfo pointer or NULL if not available\r | |
| 21 | **/\r | |
| 22 | EFI_XEN_INFO *\r | |
| 23 | EFIAPI\r | |
| 24 | XenGetInfoHOB (\r | |
| 25 | VOID\r | |
| 26 | )\r | |
| 27 | {\r | |
| 054c3fe9 AP |
28 | EFI_HOB_GUID_TYPE *GuidHob;\r |
| 29 | STATIC BOOLEAN Cached = FALSE;\r | |
| 30 | STATIC EFI_XEN_INFO *XenInfo;\r | |
| 31 | \r | |
| 32 | //\r | |
| 33 | // Return the cached result for the benefit of XenDetected that can be\r | |
| 34 | // called many times.\r | |
| 35 | //\r | |
| 36 | if (Cached) {\r | |
| 37 | return XenInfo;\r | |
| 38 | }\r | |
| f496443e AP |
39 | \r |
| 40 | GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);\r | |
| 41 | if (GuidHob == NULL) {\r | |
| 054c3fe9 AP |
42 | XenInfo = NULL;\r |
| 43 | } else {\r | |
| 44 | XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);\r | |
| f496443e | 45 | }\r |
| 054c3fe9 AP |
46 | Cached = TRUE;\r |
| 47 | return XenInfo;\r | |
| f496443e AP |
48 | }\r |
| 49 | \r | |
| 50 | /**\r | |
| 51 | This function detects if OVMF is running on Xen.\r | |
| 52 | \r | |
| 53 | @retval TRUE OVMF is running on Xen\r | |
| 54 | @retval FALSE Xen has not been detected\r | |
| 55 | **/\r | |
| 56 | BOOLEAN\r | |
| 57 | EFIAPI\r | |
| 58 | XenDetected (\r | |
| 59 | VOID\r | |
| 60 | )\r | |
| 61 | {\r | |
| 62 | return (XenGetInfoHOB () != NULL);\r | |
| 63 | }\r | |
| 64 | \r | |
| 65 | /**\r | |
| 66 | This function detect if OVMF have started via the PVH entry point.\r | |
| 67 | \r | |
| 68 | @retval TRUE PVH entry point as been used\r | |
| 69 | @retval FALSE OVMF have started via the HVM route\r | |
| 70 | **/\r | |
| 71 | BOOLEAN\r | |
| 72 | EFIAPI\r | |
| 73 | XenPvhDetected (\r | |
| 74 | VOID\r | |
| 75 | )\r | |
| 76 | {\r | |
| 77 | EFI_XEN_INFO *XenInfo;\r | |
| 78 | \r | |
| 79 | XenInfo = XenGetInfoHOB ();\r | |
| 80 | return (XenInfo != NULL && XenInfo->RsdpPvh != NULL);\r | |
| 81 | }\r |