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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 |