diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/OvmfPkg/Library/XenPlatformLib | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/OvmfPkg/Library/XenPlatformLib')
| -rw-r--r-- | roms/edk2/OvmfPkg/Library/XenPlatformLib/XenPlatformLib.c | 81 | ||||
| -rw-r--r-- | roms/edk2/OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf | 33 |
2 files changed, 114 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/XenPlatformLib/XenPlatformLib.c b/roms/edk2/OvmfPkg/Library/XenPlatformLib/XenPlatformLib.c new file mode 100644 index 000000000..8f20ae2d4 --- /dev/null +++ b/roms/edk2/OvmfPkg/Library/XenPlatformLib/XenPlatformLib.c @@ -0,0 +1,81 @@ +/** @file
+ Get information about Xen
+
+ This library simply allow to find out if OVMF is running under Xen and
+ allow to get more information when it is the case.
+
+ Copyright (c) 2019, Citrix Systems, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+#include <Library/HobLib.h>
+#include <Library/XenPlatformLib.h>
+
+/**
+ This function return a pointer to the XenInfo HOB.
+
+ @return XenInfo pointer or NULL if not available
+**/
+EFI_XEN_INFO *
+EFIAPI
+XenGetInfoHOB (
+ VOID
+ )
+{
+ EFI_HOB_GUID_TYPE *GuidHob;
+ STATIC BOOLEAN Cached = FALSE;
+ STATIC EFI_XEN_INFO *XenInfo;
+
+ //
+ // Return the cached result for the benefit of XenDetected that can be
+ // called many times.
+ //
+ if (Cached) {
+ return XenInfo;
+ }
+
+ GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
+ if (GuidHob == NULL) {
+ XenInfo = NULL;
+ } else {
+ XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
+ }
+ Cached = TRUE;
+ return XenInfo;
+}
+
+/**
+ This function detects if OVMF is running on Xen.
+
+ @retval TRUE OVMF is running on Xen
+ @retval FALSE Xen has not been detected
+**/
+BOOLEAN
+EFIAPI
+XenDetected (
+ VOID
+ )
+{
+ return (XenGetInfoHOB () != NULL);
+}
+
+/**
+ This function detect if OVMF have started via the PVH entry point.
+
+ @retval TRUE PVH entry point as been used
+ @retval FALSE OVMF have started via the HVM route
+**/
+BOOLEAN
+EFIAPI
+XenPvhDetected (
+ VOID
+ )
+{
+ EFI_XEN_INFO *XenInfo;
+
+ XenInfo = XenGetInfoHOB ();
+ return (XenInfo != NULL && XenInfo->RsdpPvh != NULL);
+}
diff --git a/roms/edk2/OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf b/roms/edk2/OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf new file mode 100644 index 000000000..32adb246d --- /dev/null +++ b/roms/edk2/OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf @@ -0,0 +1,33 @@ +## @file
+# Get information about Xen
+#
+# This library simply allow to find out if OVMF is running under Xen and
+# allow to get more information when it is the case.
+#
+# Copyright (c) 2019, Citrix Systems, Inc.
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = XenPlatformLib
+ FILE_GUID = DB54DBB7-8142-4EE5-9364-78C824B582EB
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = XenPlatformLib
+
+[Sources]
+ XenPlatformLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+ HobLib
+
+[Guids]
+ gEfiXenInfoGuid
|