RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429
This library sets / gets the Hob list pointer in TDX_WORK_AREA. This is because it is designed to be used in SEC where the value of global variable cannot be saved, so the Hob list pointer is saved in TDX_WORK_AREA. TDX_WORK_AREA shares the same base address as SEV_WORK_AREA which is pointed by PcdSevEsWorkAreaBase. This PCD will be renamed to PcdCcWorkAreaBase as Gerd suggested. See https://edk2.groups.io/g/devel/message/86642 Cc: Michael D Kinney <[email protected]> Cc: Brijesh Singh <[email protected]> Cc: Erdem Aktas <[email protected]> Cc: James Bottomley <[email protected]> Cc: Jiewen Yao <[email protected]> Cc: Tom Lendacky <[email protected]> Cc: Gerd Hoffmann <[email protected]> Acked-by: Gerd Hoffmann <[email protected]> Signed-off-by: Min Xu <[email protected]> --- .../PrePiHobListPointer.c | 57 +++++++++++++++++++ .../PrePiHobListPointerLibTdx.inf | 29 ++++++++++ 2 files changed, 86 insertions(+) create mode 100644 OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c create mode 100644 OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf diff --git a/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c b/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c new file mode 100644 index 000000000000..1b41a3983c99 --- /dev/null +++ b/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c @@ -0,0 +1,57 @@ +/** @file +* +* Copyright (c) 2021, Intel Corporation. All rights reserved.<BR> +* SPDX-License-Identifier: BSD-2-Clause-Patent +* +**/ + +#include <PiPei.h> +#include <Library/PrePiHobListPointerLib.h> +#include <Library/DebugLib.h> +#include <Library/HobLib.h> +#include <WorkArea.h> + +/** + Returns the pointer to the HOB list. + + This function returns the pointer to first HOB in the list. + + @return The pointer to the HOB list. + +**/ +VOID * +EFIAPI +PrePeiGetHobList ( + VOID + ) +{ + TDX_WORK_AREA *TdxWorkArea; + + TdxWorkArea = (TDX_WORK_AREA *)(UINTN)FixedPcdGet32 (PcdSevEsWorkAreaBase); + ASSERT (TdxWorkArea != NULL); + ASSERT (TdxWorkArea->SecTdxWorkArea.HobList != 0); + + return (VOID *)(UINTN)TdxWorkArea->SecTdxWorkArea.HobList; +} + +/** + Updates the pointer to the HOB list. + + @param HobList Hob list pointer to store + +**/ +EFI_STATUS +EFIAPI +PrePeiSetHobList ( + IN VOID *HobList + ) +{ + TDX_WORK_AREA *TdxWorkArea; + + TdxWorkArea = (TDX_WORK_AREA *)(UINTN)FixedPcdGet32 (PcdSevEsWorkAreaBase); + ASSERT (TdxWorkArea != NULL); + + TdxWorkArea->SecTdxWorkArea.HobList = (UINTN)HobList; + + return EFI_SUCCESS; +} diff --git a/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf b/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf new file mode 100644 index 000000000000..2667f841cea2 --- /dev/null +++ b/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf @@ -0,0 +1,29 @@ +#/** @file +# +# Copyright (c) 2021, Intel Corporation. All rights reserved.<BR> +# SPDX-License-Identifier: BSD-2-Clause-Patent +# +#**/ + +[Defines] + INF_VERSION = 0x00010005 + BASE_NAME = PrePiHobListPointerLibTdx + FILE_GUID = 28297DB9-4CE7-4679-80E6-0270B215A2F2 + MODULE_TYPE = BASE + VERSION_STRING = 1.0 + LIBRARY_CLASS = PrePiHobListPointerLib + +[Sources] + PrePiHobListPointer.c + +[Packages] + MdePkg/MdePkg.dec + OvmfPkg/OvmfPkg.dec + EmbeddedPkg/EmbeddedPkg.dec + UefiCpuPkg/UefiCpuPkg.dec + +[Pcd] + gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaBase + +[LibraryClasses] + PcdLib -- 2.29.2.windows.2 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#87510): https://edk2.groups.io/g/devel/message/87510 Mute This Topic: https://groups.io/mt/89743601/21656 Group Owner: [email protected] Unsubscribe: https://edk2.groups.io/g/devel/unsub [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
