f496443eb3
The purpose of XenPlatformLib is to regroup the few functions that are used in several places to detect if Xen is detected, and to get the XenInfo HOB. Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689 Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20190813113119.14804-14-anthony.perard@citrix.com>
70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
/** @file
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Get information about Xen
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This library simply allow to find out if OVMF is running under Xen and
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allow to get more information when it is the case.
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Copyright (c) 2019, Citrix Systems, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiDxe.h>
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#include <Library/HobLib.h>
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#include <Library/XenPlatformLib.h>
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/**
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This function return a pointer to the XenInfo HOB.
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@return XenInfo pointer or NULL if not available
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**/
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EFI_XEN_INFO *
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EFIAPI
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XenGetInfoHOB (
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VOID
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)
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{
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EFI_HOB_GUID_TYPE *GuidHob;
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GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
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if (GuidHob == NULL) {
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return NULL;
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}
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return (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
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}
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/**
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This function detects if OVMF is running on Xen.
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@retval TRUE OVMF is running on Xen
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@retval FALSE Xen has not been detected
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**/
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BOOLEAN
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EFIAPI
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XenDetected (
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VOID
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)
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{
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return (XenGetInfoHOB () != NULL);
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}
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/**
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This function detect if OVMF have started via the PVH entry point.
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@retval TRUE PVH entry point as been used
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@retval FALSE OVMF have started via the HVM route
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**/
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BOOLEAN
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EFIAPI
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XenPvhDetected (
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VOID
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)
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{
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EFI_XEN_INFO *XenInfo;
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XenInfo = XenGetInfoHOB ();
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return (XenInfo != NULL && XenInfo->RsdpPvh != NULL);
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}
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