[edk2-devel] [edk2-platforms][PATCH V2 1/3] IntelSiliconPkg/FirmwareBootMediaLib: Add library
Ni, Ray
ray.ni at intel.com
Wed Oct 9 09:35:51 UTC 2019
Michael,
Two comments:
1. The difference between PEI and DXE instances is DXE instance has a global variable caching the boot media type. Both get the type from HOB. So I am thinking how about simplifying the library to have only one instance which equals to PEI instance. That can also be used in DXE phase.
2. With the definition of enum type FW_BOOT_MEDIA_TYPE and GetType() API, I feel the other several FirmwareBootMediaIsXXX() APIs are not very necessary.
Thanks,
Ray
> -----Original Message-----
> From: Kubacki, Michael A <michael.a.kubacki at intel.com>
> Sent: Saturday, October 5, 2019 1:29 AM
> To: devel at edk2.groups.io
> Cc: Chaganty, Rangasai V <rangasai.v.chaganty at intel.com>; Ni, Ray
> <ray.ni at intel.com>
> Subject: [edk2-platforms][PATCH V2 1/3]
> IntelSiliconPkg/FirmwareBootMediaLib: Add library
>
> REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2229
>
> Adds a new library that is used to make system initialization
> decisions in the boot flow dependent upon firmware boot media.
> Note that the firmware boot media is the storage media that
> the boot firmware is stored on. It is not the OS storage media
> which may be stored upon a different non-volatile storage device.
>
> Any Intel board, platform, or silicon code that must take action
> conditionally based on the firmware boot media must use this
> library API.
>
> Cc: Sai Chaganty <rangasai.v.chaganty at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Signed-off-by: Michael Kubacki <michael.a.kubacki at intel.com>
> ---
> Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec | 8 +-
> Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dsc | 4 +-
>
> Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFirm
> wareBootMediaLib.inf | 43 ++++++++
>
> Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwareB
> ootMediaLib.inf | 38 +++++++
> Silicon/Intel/IntelSiliconPkg/Include/Library/FirmwareBootMediaLib.h
> | 106 +++++++++++++++++++
>
> Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFirm
> wareBootMediaLib.c | 107 +++++++++++++++++++
>
> Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/FirmwareBoo
> tMediaLib.c | 109 ++++++++++++++++++++
>
> Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwareB
> ootMediaLib.c | 82 +++++++++++++++
> 8 files changed, 495 insertions(+), 2 deletions(-)
>
> diff --git a/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec
> b/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec
> index fe5bfa0dc6..f70e3b977d 100644
> --- a/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec
> +++ b/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec
> @@ -3,7 +3,7 @@
> #
> # This package provides common open source Intel silicon modules.
> #
> -# Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
> +# Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.<BR>
> # SPDX-License-Identifier: BSD-2-Clause-Patent
> #
> ##
> @@ -22,6 +22,10 @@
> #
> MicrocodeFlashAccessLib|Include/Library/MicrocodeFlashAccessLib.h
>
> + ## @libraryclass Provides services to identify the firmware boot media
> device.
> + #
> + FirmwareBootMediaLib|Include/Library/FirmwareBootMediaLib.h
> +
> [Guids]
> ## GUID for Package token space
> # {A9F8D54E-1107-4F0A-ADD0-4587E7A4A735}
> @@ -35,6 +39,8 @@
> ## Include/Guid/MicrocodeFmp.h
> gMicrocodeFmpImageTypeIdGuid = { 0x96d4fdcd, 0x1502, 0x424d, { 0x9d,
> 0x4c, 0x9b, 0x12, 0xd2, 0xdc, 0xae, 0x5c } }
>
> + gFirmwareBootMediaHobGuid = { 0x8c7340ea, 0xde8b, 0x4e06, {0xa4, 0x78,
> 0xec, 0x8b, 0x62, 0xd7, 0xa, 0x8b } }
> +
> [Ppis]
> gEdkiiVTdInfoPpiGuid = { 0x8a59fcb3, 0xf191, 0x400c, { 0x97, 0x67, 0x67,
> 0xaf, 0x2b, 0x25, 0x68, 0x4a } }
>
> diff --git a/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dsc
> b/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dsc
> index 58b5b656ef..3fb8a08b50 100644
> --- a/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dsc
> +++ b/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dsc
> @@ -1,7 +1,7 @@
> ## @file
> # This package provides common open source Intel silicon modules.
> #
> -# Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
> +# Copyright (c) 2017 - 2019, Intel Corporation. All rights reserved.<BR>
> #
> # SPDX-License-Identifier: BSD-2-Clause-Patent
> #
> @@ -80,6 +80,8 @@
>
> IntelSiliconPkg/Feature/VTd/PlatformVTdInfoSamplePei/PlatformVTdInfoSa
> mplePei.inf
>
> IntelSiliconPkg/Feature/Capsule/MicrocodeUpdateDxe/MicrocodeUpdateDx
> e.inf
>
> IntelSiliconPkg/Feature/Capsule/Library/MicrocodeFlashAccessLibNull/Micro
> codeFlashAccessLibNull.inf
> +
> IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwareBootMediaLib
> .inf
> +
> IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFirmwareBootMe
> diaLib.inf
>
> [BuildOptions]
> *_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFir
> mwareBootMediaLib.inf
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFir
> mwareBootMediaLib.inf
> new file mode 100644
> index 0000000000..83ed5f04af
> --- /dev/null
> +++
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFir
> mwareBootMediaLib.inf
> @@ -0,0 +1,43 @@
> +## @file
> +# Firmware Boot Media Library
> +#
> +# The firmware boot media device is used to make system initialization
> decisions in the boot flow dependent
> +# upon firmware boot media. Note that the firmware boot media is the
> storage media that the boot firmware is stored on.
> +# It is not the OS storage media which may be stored upon a different non-
> volatile storage device.
> +#
> +# This library contains an implementation for the DXE and SMM boot phases.
> +#
> +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = DxeSmmFirmwareBootMediaLib
> + FILE_GUID = 72F07B0B-54F5-47FD-9EDB-D796BE2B87E9
> + MODULE_TYPE = DXE_DRIVER
> + VERSION_STRING = 1.0
> + PI_SPECIFICATION_VERSION = 0x0001000A
> + LIBRARY_CLASS = FirmwareBootMediaLib|DXE_DRIVER
> DXE_SMM_DRIVER DXE_RUNTIME_DRIVER UEFI_APPLICATION
> UEFI_DRIVER
> + CONSTRUCTOR = DxeSmmFirmwareBootMediaLibInit
> +#
> +# VALID_ARCHITECTURES = IA32 X64 IPF EBC
> +#
> +
> +[Sources]
> + FirmwareBootMediaLib.c
> + DxeSmmFirmwareBootMediaLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + IntelSiliconPkg/IntelSiliconPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + DebugLib
> + HobLib
> +
> +[Guids]
> + gFirmwareBootMediaHobGuid ## CONSUMES
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwar
> eBootMediaLib.inf
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwar
> eBootMediaLib.inf
> new file mode 100644
> index 0000000000..063c4027d3
> --- /dev/null
> +++
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwar
> eBootMediaLib.inf
> @@ -0,0 +1,38 @@
> +## @file
> +# Firmware Boot Media Library
> +#
> +# The firmware boot media device is used to make system initialization
> decisions in the boot flow dependent
> +# upon firmware boot media. Note that the firmware boot media is the
> storage media that the boot firmware is stored on.
> +# It is not the OS storage media which may be stored upon a different non-
> volatile storage device.
> +#
> +# This library contains an implementation for the PEI boot phase.
> +#
> +# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = PeiFirmwareBootMediaLib
> + FILE_GUID = D3F7BD0B-3539-4F2D-AF98-EE32DBE7971F
> + MODULE_TYPE = PEIM
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = FirmwareBootMediaLib
> +
> +[Sources]
> + FirmwareBootMediaLib.c
> + PeiFirmwareBootMediaLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + IntelSiliconPkg/IntelSiliconPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + DebugLib
> + HobLib
> +
> +[Guids]
> + gFirmwareBootMediaHobGuid ## PRODUCES CONSUMES
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Include/Library/FirmwareBootMediaLib.h
> b/Silicon/Intel/IntelSiliconPkg/Include/Library/FirmwareBootMediaLib.h
> new file mode 100644
> index 0000000000..aca9593a84
> --- /dev/null
> +++ b/Silicon/Intel/IntelSiliconPkg/Include/Library/FirmwareBootMediaLib.h
> @@ -0,0 +1,106 @@
> +/** @file
> + This library identifies the firmware boot media device.
> +
> + The firmware boot media device is used to make system initialization
> decisions in the boot flow dependent
> + upon firmware boot media. Note that the firmware boot media is the
> storage media that the boot firmware is stored on.
> + It is not the OS storage media which may be stored upon a different non-
> volatile storage device.
> +
> +Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef _FIRMWARE_BOOT_MEDIA_LIB_H_
> +#define _FIRMWARE_BOOT_MEDIA_LIB_H_
> +
> +#include <Uefi.h>
> +
> +typedef enum {
> + FwBootMediaSpi,
> + FwBootMediaUfs,
> + FwBootMediaEmmc,
> + FwBootMediaNvme,
> + FwBootMediaMax
> +} FW_BOOT_MEDIA_TYPE;
> +
> +typedef struct {
> + FW_BOOT_MEDIA_TYPE BootMedia;
> +} FW_BOOT_MEDIA_HOB_DATA;
> +
> +/**
> + Determines the current platform firmware boot media device.
> +
> + @param[out] FwBootMediaType The current platform Boot Media type.
> +
> + @retval EFI_SUCCESS The operation completed successfully.
> + @retval EFI_NOT_FOUND The boot media type could not be found.
> +**/
> +EFI_STATUS
> +EFIAPI
> +GetFirmwareBootMediaType (
> + OUT FW_BOOT_MEDIA_TYPE *FwBootMediaType
> + );
> +
> +/**
> + Indicates whether the boot media is presently known.
> +
> + Note: Very early in boot this data may not be available.
> +
> + @retval TRUE Boot media is known
> + @retval FALSE Boot media is not known
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsKnown (
> + VOID
> + );
> +
> +/**
> + Determines if the platform firmware is booting from SPI.
> +
> + @retval TRUE Platform firmware is booting from SPI
> + @retval FALSE Platform firmware is booting from a non-SPI device or
> the boot media is unknown
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsSpi (
> + VOID
> + );
> +
> +/**
> + Determines if the platform firmware is booting from UFS.
> +
> + @retval TRUE Platform firmware is booting from UFS
> + @retval FALSE Platform firmware is booting from a non-UFS device or
> the boot media is unknown
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsUfs (
> + VOID
> + );
> +
> +/**
> + Determines if the platform firmware is booting from eMMC.
> +
> + @retval TRUE Platform firmware is booting from eMMC
> + @retval FALSE Platform firmware is booting from a non-eMMC device
> or the boot media is unknown
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsEmmc (
> + VOID
> + );
> +
> +/**
> + Determines if the platform firmware is booting from NVMe.
> +
> + @retval TRUE Platform firmware is booting from NVMe.
> + @retval FALSE Platform firmware is booting from a non-NVMe device or
> the boot media is unknown
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsNvme (
> + VOID
> + );
> +
> +#endif
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFir
> mwareBootMediaLib.c
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFir
> mwareBootMediaLib.c
> new file mode 100644
> index 0000000000..1e3876afb3
> --- /dev/null
> +++
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/DxeSmmFir
> mwareBootMediaLib.c
> @@ -0,0 +1,107 @@
> +/** @file
> + This library identifies the firmware boot media device.
> +
> + The firmware boot media device is used to make system initialization
> decisions in the boot flow dependent
> + upon firmware boot media. Note that the firmware boot media is the
> storage media that the boot firmware is stored on.
> + It is not the OS storage media which may be stored upon a different non-
> volatile storage device.
> +
> + This file contains implementation specific to the DXE and SMM boot phases.
> +
> +Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Library/BaseLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/FirmwareBootMediaLib.h>
> +#include <Library/HobLib.h>
> +
> +STATIC FW_BOOT_MEDIA_TYPE mFwBootMedia = FwBootMediaMax;
> +
> +/**
> + Determines the current platform firmware boot media device.
> +
> + @param[out] FwBootMediaType The current platform Boot Media type.
> +
> + @retval EFI_SUCCESS The operation completed successfully.
> + @retval EFI_NOT_FOUND The boot media type could not be found.
> +**/
> +EFI_STATUS
> +EFIAPI
> +GetFirmwareBootMediaType (
> + OUT FW_BOOT_MEDIA_TYPE *FwBootMediaType
> + )
> +{
> + if (mFwBootMedia == FwBootMediaMax) {
> + return EFI_NOT_FOUND;
> + }
> +
> + *FwBootMediaType = mFwBootMedia;
> + return EFI_SUCCESS;
> +}
> +
> +/**
> + Determines if the boot media is presently known.
> +
> + Note: Very early in boot this data may not be available.
> +
> + @retval TRUE Boot media is known
> + @retval FALSE Boot media is not known
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsKnown (
> + VOID
> + )
> +{
> + return mFwBootMedia != FwBootMediaMax;
> +}
> +
> +/**
> + The library constructor.
> +
> + This constructor depends upon gFirmwareBootMediaHobGuid.
> + It should be produced by the platform in the HOB producer phase.
> +
> + @param[in] ImageHandle The firmware allocated handle for the UEFI
> image.
> + @param[in] SystemTable A pointer to the EFI system table.
> +
> + @retval EFI_SUCCESS The constructor executed successfully.
> + @retval EFI_NOT_FOUND The gFirmwareBootMediaHobGuid HOB
> could not be located
> + or the boot media type is invalid.
> +**/
> +EFI_STATUS
> +EFIAPI
> +DxeSmmFirmwareBootMediaLibInit (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + FW_BOOT_MEDIA_HOB_DATA *BootMediaHobData;
> + FW_BOOT_MEDIA_TYPE BootMediaType;
> + EFI_HOB_GUID_TYPE *GuidHobPtr;
> +
> + GuidHobPtr = GetFirstGuidHob (&gFirmwareBootMediaHobGuid);
> + if (GuidHobPtr == NULL) {
> + DEBUG ((DEBUG_ERROR, "The firmware boot media HOB does not
> exist!\n"));
> + ASSERT (GuidHobPtr != NULL);
> + return EFI_NOT_FOUND;
> + }
> +
> + BootMediaHobData = (FW_BOOT_MEDIA_HOB_DATA *)
> GET_GUID_HOB_DATA (GuidHobPtr);
> + if (BootMediaHobData == NULL) {
> + return EFI_NOT_FOUND;
> + }
> +
> + BootMediaType = BootMediaHobData->BootMedia;
> +
> + if (BootMediaType >= FwBootMediaMax) {
> + DEBUG ((DEBUG_ERROR, "The firmware boot media HOB specifies an
> invalid media type.\n"));
> + return EFI_NOT_FOUND;
> + }
> +
> + mFwBootMedia = BootMediaType;
> +
> + return EFI_SUCCESS;
> +}
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/FirmwareB
> ootMediaLib.c
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/FirmwareB
> ootMediaLib.c
> new file mode 100644
> index 0000000000..11a14d172d
> --- /dev/null
> +++
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/FirmwareB
> ootMediaLib.c
> @@ -0,0 +1,109 @@
> +/** @file
> + This library identifies the firmware boot media device.
> +
> + The firmware boot media device is used to make system initialization
> decisions in the boot flow dependent
> + upon firmware boot media. Note that the firmware boot media is the
> storage media that the boot firmware is stored on.
> + It is not the OS storage media which may be stored upon a different non-
> volatile storage device.
> +
> + This file contains library implementation common to all boot phases.
> +
> +Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Library/BaseLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/FirmwareBootMediaLib.h>
> +
> +/**
> + Determines if the platform firmware is booting from SPI.
> +
> + @retval TRUE Platform firmware is booting from SPI
> + @retval FALSE Platform firmware is booting from a non-SPI device or
> the boot media is unknown
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsSpi (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + FW_BOOT_MEDIA_TYPE BootMedia;
> +
> + Status = GetFirmwareBootMediaType (&BootMedia);
> + if (EFI_ERROR (Status) || BootMedia != FwBootMediaSpi) {
> + return FALSE;
> + } else {
> + return TRUE;
> + }
> +}
> +
> +/**
> + Determines if the platform firmware is booting from UFS.
> +
> + @retval TRUE Platform firmware is booting from UFS
> + @retval FALSE Platform firmware is booting from a non-UFS device or
> the boot media is unknown
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsUfs (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + FW_BOOT_MEDIA_TYPE BootMedia;
> +
> + Status = GetFirmwareBootMediaType (&BootMedia);
> + if (EFI_ERROR (Status) || BootMedia != FwBootMediaUfs) {
> + return FALSE;
> + } else {
> + return TRUE;
> + }
> +}
> +
> +/**
> + Determines if the platform firmware is booting from eMMC.
> +
> + @retval TRUE Platform firmware is booting from eMMC
> + @retval FALSE Platform firmware is booting from a non-eMMC device
> or the boot media is unknown
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsEmmc (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + FW_BOOT_MEDIA_TYPE BootMedia;
> +
> + Status = GetFirmwareBootMediaType (&BootMedia);
> + if (EFI_ERROR (Status) || BootMedia != FwBootMediaEmmc) {
> + return FALSE;
> + } else {
> + return TRUE;
> + }
> +}
> +
> +/**
> + Determines if the platform firmware is booting from NVMe.
> +
> + @retval TRUE Platform firmware is booting from NVMe.
> + @retval FALSE Platform firmware is booting from a non-NVMe device or
> the boot media is unknown
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsNvme (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + FW_BOOT_MEDIA_TYPE BootMedia;
> +
> + Status = GetFirmwareBootMediaType (&BootMedia);
> + if (EFI_ERROR (Status) || BootMedia != FwBootMediaNvme) {
> + return FALSE;
> + } else {
> + return TRUE;
> + }
> +}
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwar
> eBootMediaLib.c
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwar
> eBootMediaLib.c
> new file mode 100644
> index 0000000000..14478e0dbe
> --- /dev/null
> +++
> b/Silicon/Intel/IntelSiliconPkg/Library/PeiDxeSmmBootMediaLib/PeiFirmwar
> eBootMediaLib.c
> @@ -0,0 +1,82 @@
> +/** @file
> + This library identifies the firmware boot media device.
> +
> + The firmware boot media device is used to make system initialization
> decisions in the boot flow dependent
> + upon firmware boot media. Note that the firmware boot media is the
> storage media that the boot firmware is stored on.
> + It is not the OS storage media which may be stored upon a different non-
> volatile storage device.
> +
> + This file contains implementation specific to the PEI boot phase.
> +
> +Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Library/BaseLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/FirmwareBootMediaLib.h>
> +#include <Library/HobLib.h>
> +
> +/**
> + Determines the current platform firmware boot media device.
> +
> + @param[out] FwBootMediaType The current platform Boot Media type.
> +
> + @retval EFI_SUCCESS The operation completed successfully.
> + @retval EFI_NOT_FOUND The boot media type could not be found.
> +**/
> +EFI_STATUS
> +EFIAPI
> +GetFirmwareBootMediaType (
> + OUT FW_BOOT_MEDIA_TYPE *FwBootMediaType
> + )
> +{
> + FW_BOOT_MEDIA_HOB_DATA *BootMediaHobData;
> + EFI_HOB_GUID_TYPE *GuidHobPtr;
> +
> + GuidHobPtr = GetFirstGuidHob (&gFirmwareBootMediaHobGuid);
> + if (GuidHobPtr == NULL) {
> + DEBUG ((DEBUG_ERROR, "The firmware boot media HOB does not
> exist!\n"));
> + ASSERT (GuidHobPtr != NULL);
> + return EFI_NOT_FOUND;
> + }
> +
> + BootMediaHobData = (FW_BOOT_MEDIA_HOB_DATA *)
> GET_GUID_HOB_DATA (GuidHobPtr);
> + if (BootMediaHobData == NULL) {
> + return EFI_NOT_FOUND;
> + }
> +
> + if (BootMediaHobData->BootMedia >= FwBootMediaMax) {
> + DEBUG ((DEBUG_ERROR, "The firmware boot media HOB specifies an
> invalid media type.\n"));
> + return EFI_NOT_FOUND;
> + }
> + *FwBootMediaType = BootMediaHobData->BootMedia;
> +
> + return EFI_SUCCESS;
> +}
> +
> +/**
> + Determines if the boot media is presently known.
> +
> + Note: Very early in boot this data may not be available.
> +
> + @retval TRUE Boot media is known
> + @retval FALSE Boot media is not known
> +**/
> +BOOLEAN
> +EFIAPI
> +FirmwareBootMediaIsKnown (
> + VOID
> + )
> +{
> + EFI_STATUS Status;
> + FW_BOOT_MEDIA_TYPE BootMedia;
> +
> + BootMedia = FwBootMediaMax;
> + Status = GetFirmwareBootMediaType (&BootMedia);
> + if (EFI_ERROR (Status) || BootMedia == FwBootMediaMax) {
> + return FALSE;
> + } else {
> + return TRUE;
> + }
> +}
> --
> 2.16.2.windows.1
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#48631): https://edk2.groups.io/g/devel/message/48631
Mute This Topic: https://groups.io/mt/34396660/1813853
Group Owner: devel+owner at edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [edk2-devel-archive at redhat.com]
-=-=-=-=-=-=-=-=-=-=-=-
More information about the edk2-devel-archive
mailing list