tyler.durden
/
audk
mirror of https://github.com/acidanthera/audk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

EmbeddedPkg : Add FdtPlatformDxe driver 

The FdtPlatformDxe driver installs the FDT of the platform it
is running on into the UEFI Configuration table at the end of
the DXE phase.

Please refer to the README.txt file for a global overview of
the driver.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ronald Cron <Ronald.Cron@arm.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16933 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ronald Cron 2015-02-25 19:20:57 +00:00 committed by oliviermartin
parent d0c1d371fb
commit 158497a094
6 changed files with 863 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

742
EmbeddedPkg/Drivers/FdtPlatformDxe/FdtPlatform.c Normal file
View File

@ -0,0 +1,742 @@
/** @file
Copyright (c) 2015, ARM Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/PcdLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BdsLib.h>
#include <Protocol/DevicePathFromText.h>
#include <Protocol/DevicePath.h>
#include <Guid/EventGroup.h>
#include <Guid/Fdt.h>
#include <libfdt.h>
//
// Internal types
//
STATIC VOID OnEndOfDxe (
IN EFI_EVENT Event,
IN VOID *Context
);
STATIC EFI_STATUS RunFdtInstallation (
VOID
);
STATIC EFI_STATUS InstallFdt (
IN CONST CHAR16* TextDevicePath
);
/**
Main entry point of the FDT platform driver.
@param[in] ImageHandle The firmware allocated handle for the present driver
UEFI image.
@param[in] *SystemTable A pointer to the EFI System table.
@retval EFI_SUCCESS The driver was initialized.
@retval EFI_OUT_OF_RESOURCES The "End of DXE" event could not be allocated.
**/
EFI_STATUS
FdtPlatformEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_EVENT EndOfDxeEvent;
//
// Create an event belonging to the "gEfiEndOfDxeEventGroupGuid" group.
// The "OnEndOfDxe()" function is declared as the call back function.
// It will be called at the end of the DXE phase when an event of the
// same group is signalled to inform about the end of the DXE phase.
//
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
OnEndOfDxe,
NULL,
&gEfiEndOfDxeEventGroupGuid,
&EndOfDxeEvent
);
return Status;
}
/**
Notification function of the event defined as belonging to the
EFI_END_OF_DXE_EVENT_GROUP_GUID event group that was created in
the entry point of the driver.
This function is called when an event belonging to the
EFI_END_OF_DXE_EVENT_GROUP_GUID event group is signalled. Such an
event is signalled once at the end of the dispatching of all
drivers (end of the so called DXE phase).
@param[in] Event Event declared in the entry point of the driver whose
notification function is being invoked.
@param[in] Context NULL
**/
STATIC
VOID
OnEndOfDxe (
IN EFI_EVENT Event,
IN VOID *Context
)
{
RunFdtInstallation ();
gBS->CloseEvent (Event);
}
/**
Run the FDT installation process.
Loop in priority order over the device paths from which the FDT has
been asked to be retrieved for. For each device path, try to install
the FDT. Stop as soon as an installation succeeds.
@retval EFI_SUCCESS The FDT was installed.
@retval EFI_NOT_FOUND Failed to locate a protocol or a file.
@retval EFI_INVALID_PARAMETER Invalid device path.
@retval EFI_UNSUPPORTED Device path not supported.
@retval EFI_OUT_OF_RESOURCES An allocation failed.
**/
STATIC
EFI_STATUS
RunFdtInstallation (
VOID
)
{
EFI_STATUS Status;
UINTN DataSize;
VOID *Data;
CHAR16 *TextDevicePathStart;
CHAR16 *TextDevicePathSeparator;
UINTN TextDevicePathLen;
CHAR16 *TextDevicePath;
//
// For development purpose, if enabled through the "PcdOverridePlatformFdt"
// feature PCD, try first to install the FDT specified by the device path in
// text form stored in the "Fdt" UEFI variable.
//
if (FeaturePcdGet (PcdOverridePlatformFdt)) {
Data = NULL;
DataSize = 0;
Status = gRT->GetVariable (
L"Fdt",
&gFdtVariableGuid,
NULL,
&DataSize,
Data
);
//
// Keep going only if the "Fdt" variable is defined.
//
if (Status == EFI_BUFFER_TOO_SMALL) {
Data = AllocatePool (DataSize);
if (Data == NULL) {
Status = EFI_OUT_OF_RESOURCES;
} else {
Status = gRT->GetVariable (
L"Fdt",
&gFdtVariableGuid,
NULL,
&DataSize,
Data
);
if (!EFI_ERROR (Status)) {
Status = InstallFdt ((CHAR16*)Data);
if (!EFI_ERROR (Status)) {
DEBUG ((
EFI_D_WARN,
"Installation of the FDT using the device path <%s> completed.\n",
(CHAR16*)Data
));
}
}
FreePool (Data);
}
if (EFI_ERROR (Status)) {
DEBUG ((
EFI_D_ERROR,
"Installation of the FDT specified by the \"Fdt\" UEFI variable failed - %r\n",
Status
));
} else {
return Status;
}
}
}
//
// Loop over the device path list provided by "PcdFdtDevicePaths". The device
// paths are in text form and separated by a semi-colon.
//
Status = EFI_SUCCESS;
for (TextDevicePathStart = (CHAR16*)PcdGetPtr (PcdFdtDevicePaths);
*TextDevicePathStart != L'\0' ; ) {
TextDevicePathSeparator = StrStr (TextDevicePathStart, L";");
//
// Last device path of the list
//
if (TextDevicePathSeparator == NULL) {
TextDevicePath = TextDevicePathStart;
} else {
TextDevicePathLen = (UINTN)(TextDevicePathSeparator - TextDevicePathStart);
TextDevicePath = AllocateCopyPool (
(TextDevicePathLen + 1) * sizeof (CHAR16),
TextDevicePathStart
);
if (TextDevicePath == NULL) {
Status = EFI_OUT_OF_RESOURCES;
DEBUG ((EFI_D_ERROR, "Memory allocation error during FDT installation process.\n"));
break;
}
TextDevicePath[TextDevicePathLen] = L'\0';
}
Status = InstallFdt (TextDevicePath);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_WARN, "Installation of the FDT using the device path <%s> failed - %r.\n",
TextDevicePath, Status
));
} else {
DEBUG ((EFI_D_WARN, "Installation of the FDT using the device path <%s> completed.\n",
TextDevicePath
));
}
if (TextDevicePathSeparator == NULL) {
break;
} else {
FreePool (TextDevicePath);
if (!EFI_ERROR (Status)) {
break;
}
TextDevicePathStart = TextDevicePathSeparator + 1;
}
}
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "Failed to install the FDT - %r.\n", Status));
}
return Status;
}
/**
Install the FDT specified by its device path in text form.
@param[in] TextDevicePath Device path of the FDT to install in text form
@retval EFI_SUCCESS The FDT was installed.
@retval EFI_NOT_FOUND Failed to locate a protocol or a file.
@retval EFI_INVALID_PARAMETER Invalid device path.
@retval EFI_UNSUPPORTED Device path not supported.
@retval EFI_OUT_OF_RESOURCES An allocation failed.
**/
STATIC
EFI_STATUS
InstallFdt (
IN CONST CHAR16* TextDevicePath
)
{
EFI_STATUS Status;
EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL *EfiDevicePathFromTextProtocol;
EFI_DEVICE_PATH *DevicePath;
EFI_PHYSICAL_ADDRESS FdtBlobBase;
UINTN FdtBlobSize;
UINTN NbPages;
EFI_PHYSICAL_ADDRESS RsFdtBlobBase;
Status = gBS->LocateProtocol (
&gEfiDevicePathFromTextProtocolGuid,
NULL,
(VOID **)&EfiDevicePathFromTextProtocol
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "InstallFdt() - Failed to locate EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL protocol\n"));
return Status;
}
DevicePath = (EFI_DEVICE_PATH*)EfiDevicePathFromTextProtocol->ConvertTextToDevicePath (TextDevicePath);
if (DevicePath == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Load the FDT given its device path.
// This operation may fail if the device path is not supported.
//
FdtBlobBase = 0;
NbPages = 0;
Status = BdsLoadImage (DevicePath, AllocateAnyPages, &FdtBlobBase, &FdtBlobSize);
if (EFI_ERROR (Status)) {
goto Error;
}
// Check the FDT header is valid. We only make this check in DEBUG mode in
// case the FDT header change on production device and this ASSERT() becomes
// not valid.
ASSERT (fdt_check_header ((VOID*)(UINTN)FdtBlobBase) == 0);
//
// Ensure the Size of the Device Tree is smaller than the size of the read file
//
ASSERT ((UINTN)fdt_totalsize ((VOID*)(UINTN)FdtBlobBase) <= FdtBlobSize);
//
// Store the FDT as Runtime Service Data to prevent the Kernel from
// overwritting its data.
//
NbPages = EFI_SIZE_TO_PAGES (FdtBlobSize);
Status = gBS->AllocatePages (
AllocateAnyPages, EfiRuntimeServicesData,
NbPages, &RsFdtBlobBase
);
if (EFI_ERROR (Status)) {
goto Error;
}
CopyMem (
(VOID*)((UINTN)RsFdtBlobBase),
(VOID*)((UINTN)FdtBlobBase),
FdtBlobSize
);
//
// Install the FDT into the Configuration Table
//
Status = gBS->InstallConfigurationTable (
&gFdtTableGuid,
(VOID*)((UINTN)RsFdtBlobBase)
);
if (EFI_ERROR (Status)) {
gBS->FreePages (RsFdtBlobBase, NbPages);
}
Error :
if (FdtBlobBase != 0) {
gBS->FreePages (FdtBlobBase, NbPages);
}
FreePool (DevicePath);
return Status;
}
=======
/**
This is the shell command "setfdt" handler function. This function handles
the command when it is invoked in the shell.
@param[in] This The instance of the
EFI_SHELL_DYNAMIC_COMMAND_PROTOCOL.
@param[in] SystemTable The pointer to the UEFI system table.
@param[in] ShellParameters The parameters associated with the command.
@param[in] Shell The instance of the shell protocol used in the
context of processing this command.
@return SHELL_SUCCESS The operation was successful.
@return SHELL_ABORTED Operation aborted due to internal error.
@return SHELL_INVALID_PARAMETER The parameters of the command are not valid.
@return SHELL_INVALID_PARAMETER The EFI Shell file path is not valid.
@return SHELL_NOT_FOUND Failed to locate a protocol or a file.
@return SHELL_UNSUPPORTED Device path not supported.
@return SHELL_OUT_OF_RESOURCES A memory allocation failed.
@return SHELL_DEVICE_ERROR The "Fdt" variable could not be saved due to a hardware failure.
@return SHELL_ACCESS_DENIED The "Fdt" variable is read-only.
@return SHELL_ACCESS_DENIED The "Fdt" variable cannot be deleted.
@return SHELL_ACCESS_DENIED The "Fdt" variable could not be written due to security violation.
**/
STATIC
SHELL_STATUS
EFIAPI
ShellDynCmdSetFdtHandler (
IN EFI_SHELL_DYNAMIC_COMMAND_PROTOCOL *This,
IN EFI_SYSTEM_TABLE *SystemTable,
IN EFI_SHELL_PARAMETERS_PROTOCOL *ShellParameters,
IN EFI_SHELL_PROTOCOL *Shell
)
{
SHELL_STATUS ShellStatus;
EFI_STATUS Status;
LIST_ENTRY *ParamPackage;
BOOLEAN FilePath;
CONST CHAR16 *ValueStr;
ShellStatus = SHELL_SUCCESS;
ParamPackage = NULL;
FilePath = FALSE;
//
// Install the Shell and Shell Parameters Protocols on the driver
// image. This is necessary for the initialisation of the Shell
// Library to succeed in the next step.
//
Status = gBS->InstallMultipleProtocolInterfaces (
&gImageHandle,
&gEfiShellProtocolGuid, Shell,
&gEfiShellParametersProtocolGuid, ShellParameters,
NULL
);
if (EFI_ERROR (Status)) {
return SHELL_ABORTED;
}
//
// Initialise the Shell Library as we are going to use it.
// Assert that the return code is EFI_SUCCESS as it should.
// To anticipate any change is the codes returned by
// ShellInitialize(), leave in case of error.
//
Status = ShellInitialize ();
if (EFI_ERROR (Status)) {
ASSERT_EFI_ERROR (Status);
return SHELL_ABORTED;
}
Status = ShellCommandLineParse (ParamList, &ParamPackage, NULL, TRUE);
if (!EFI_ERROR (Status)) {
switch (ShellCommandLineGetCount (ParamPackage)) {
case 1:
//
// Case "setfdt -i"
//
if (!ShellCommandLineGetFlag (ParamPackage, L"-i")) {
Status = EFI_INVALID_PARAMETER;
}
break;
case 2:
//
// Case "setfdt file_path" or
// "setfdt -i file_path" or
// "setfdt file_path -i"
//
FilePath = TRUE;
break;
default:
Status = EFI_INVALID_PARAMETER;
}
}
if (EFI_ERROR (Status)) {
ShellStatus = EfiCodeToShellCode (Status);
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_ERROR),
mFdtPlatformDxeHiiHandle,
Status
);
goto Error;
}
//
// Update the preferred device path for the FDT if asked for.
//
if (FilePath) {
ValueStr = ShellCommandLineGetRawValue (ParamPackage, 1);
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_UPDATING),
mFdtPlatformDxeHiiHandle
);
ShellStatus = UpdateFdtTextDevicePath (Shell, ValueStr);
if (ShellStatus != SHELL_SUCCESS) {
goto Error;
}
}
//
// Run the FDT installation process if asked for.
//
if (ShellCommandLineGetFlag (ParamPackage, L"-i")) {
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_INSTALLING),
mFdtPlatformDxeHiiHandle
);
Status = RunFdtInstallation ();
ShellStatus = EfiCodeToShellCode (Status);
if (!EFI_ERROR (Status)) {
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_INSTALL_SUCCEEDED),
mFdtPlatformDxeHiiHandle
);
} else {
if (Status == EFI_INVALID_PARAMETER) {
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_INVALID_DEVICE_PATH),
mFdtPlatformDxeHiiHandle
);
} else {
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_ERROR),
mFdtPlatformDxeHiiHandle,
Status
);
}
}
}
Error:
gBS->UninstallMultipleProtocolInterfaces (
gImageHandle,
&gEfiShellProtocolGuid, Shell,
&gEfiShellParametersProtocolGuid, ShellParameters,
NULL
);
ShellCommandLineFreeVarList (ParamPackage);
return ShellStatus;
}
/**
This is the shell command "setfdt" help handler function. This
function returns the formatted help for the "setfdt" command.
The format matchs that in Appendix B of the revision 2.1 of the
UEFI Shell Specification.
@param[in] This The instance of the EFI_SHELL_DYNAMIC_COMMAND_PROTOCOL.
@param[in] Language The pointer to the language string to use.
@return CHAR16* Pool allocated help string, must be freed by caller.
**/
STATIC
CHAR16*
EFIAPI
ShellDynCmdSetFdtGetHelp (
IN EFI_SHELL_DYNAMIC_COMMAND_PROTOCOL *This,
IN CONST CHAR8 *Language
)
{
//
// This allocates memory. The caller has to free the allocated memory.
//
return HiiGetString (
mFdtPlatformDxeHiiHandle,
STRING_TOKEN (STR_GET_HELP_SETFDT),
Language
);
}
/**
Update the text device path stored in the "Fdt" UEFI variable given
an EFI Shell file path or a text device path.
This function is a subroutine of the ShellDynCmdSetFdtHandler() function
to make its code easier to read.
@param[in] Shell The instance of the shell protocol used in the
context of processing the "setfdt" command.
@param[in] FilePath EFI Shell path or the device path to the FDT file.
@return SHELL_SUCCESS The text device path was succesfully updated.
@return SHELL_INVALID_PARAMETER The Shell file path is not valid.
@return SHELL_OUT_OF_RESOURCES A memory allocation failed.
@return SHELL_DEVICE_ERROR The "Fdt" variable could not be saved due to a hardware failure.
@return SHELL_ACCESS_DENIED The "Fdt" variable is read-only.
@return SHELL_ACCESS_DENIED The "Fdt" variable cannot be deleted.
@return SHELL_ACCESS_DENIED The "Fdt" variable could not be written due to security violation.
@return SHELL_NOT_FOUND Device path to text protocol not found.
@return SHELL_ABORTED Operation aborted.
**/
STATIC
SHELL_STATUS
UpdateFdtTextDevicePath (
IN EFI_SHELL_PROTOCOL *Shell,
IN CONST CHAR16 *FilePath
)
{
EFI_STATUS Status;
EFI_DEVICE_PATH *DevicePath;
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *EfiDevicePathToTextProtocol;
CHAR16 *TextDevicePath;
CHAR16 *FdtVariableValue;
EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL *EfiDevicePathFromTextProtocol;
SHELL_STATUS ShellStatus;
ASSERT (FilePath != NULL);
TextDevicePath = NULL;
FdtVariableValue = NULL;
DevicePath = Shell->GetDevicePathFromFilePath (FilePath);
if (DevicePath != NULL) {
Status = gBS->LocateProtocol (
&gEfiDevicePathToTextProtocolGuid,
NULL,
(VOID **)&EfiDevicePathToTextProtocol
);
if (EFI_ERROR (Status)) {
goto Error;
}
TextDevicePath = EfiDevicePathToTextProtocol->ConvertDevicePathToText (
DevicePath,
FALSE,
FALSE
);
if (TextDevicePath == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Error;
}
FdtVariableValue = TextDevicePath;
} else {
//
// Try to convert back the EFI Device Path String into a EFI device Path
// to ensure the format is valid
//
Status = gBS->LocateProtocol (
&gEfiDevicePathFromTextProtocolGuid,
NULL,
(VOID **)&EfiDevicePathFromTextProtocol
);
if (EFI_ERROR (Status)) {
goto Error;
}
DevicePath = EfiDevicePathFromTextProtocol->ConvertTextToDevicePath (
FilePath
);
if (DevicePath == NULL) {
Status = EFI_INVALID_PARAMETER;
goto Error;
}
FdtVariableValue = (CHAR16*)FilePath;
}
Status = gRT->SetVariable (
(CHAR16*)L"Fdt",
&gFdtVariableGuid,
EFI_VARIABLE_RUNTIME_ACCESS |
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS ,
StrSize (FdtVariableValue),
FdtVariableValue
);
Error:
ShellStatus = EfiCodeToShellCode (Status);
if (!EFI_ERROR (Status)) {
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_UPDATE_SUCCEEDED),
mFdtPlatformDxeHiiHandle,
FdtVariableValue
);
} else {
if (Status == EFI_INVALID_PARAMETER) {
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_INVALID_PATH),
mFdtPlatformDxeHiiHandle,
FilePath
);
} else {
ShellPrintHiiEx (
-1, -1, NULL,
STRING_TOKEN (STR_SETFDT_ERROR),
mFdtPlatformDxeHiiHandle,
Status
);
}
}
if (DevicePath != NULL) {
FreePool (DevicePath);
}
if (TextDevicePath != NULL) {
FreePool (TextDevicePath);
}
return ShellStatus;
}
/**
Transcode one of the EFI return code used by the model into an EFI Shell return code.
@param[in] Status EFI return code.
@return Transcoded EFI Shell return code.
**/
STATIC
SHELL_STATUS
EfiCodeToShellCode (
IN EFI_STATUS Status
)
{
SHELL_STATUS ShellStatus;
switch (Status) {
case EFI_SUCCESS :
ShellStatus = SHELL_SUCCESS;
break;
case EFI_INVALID_PARAMETER :
ShellStatus = SHELL_INVALID_PARAMETER;
break;
case EFI_UNSUPPORTED :
ShellStatus = SHELL_UNSUPPORTED;
break;
case EFI_DEVICE_ERROR :
ShellStatus = SHELL_DEVICE_ERROR;
break;
case EFI_WRITE_PROTECTED :
case EFI_SECURITY_VIOLATION :
ShellStatus = SHELL_ACCESS_DENIED;
break;
case EFI_OUT_OF_RESOURCES :
ShellStatus = SHELL_OUT_OF_RESOURCES;
break;
case EFI_NOT_FOUND :
ShellStatus = SHELL_NOT_FOUND;
break;
default :
ShellStatus = SHELL_ABORTED;
}
return ShellStatus;
}
>>>>>>> 4ac4fed... EmbeddedPkg/FdtPlatformDxe: Fix typo issue

55
EmbeddedPkg/Drivers/FdtPlatformDxe/FdtPlatformDxe.inf Normal file
View File

@ -0,0 +1,55 @@
#/** @file
#
# Copyright (c) 2015, ARM Ltd. All rights reserved.<BR>
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
#**/
[Defines]
INF_VERSION = 0x00010006
BASE_NAME = FdtPlatformDxe
FILE_GUID = 6e9a4c69-57c6-4fcd-b083-4f2c3bdb6051
MODULE_TYPE = DXE_DRIVER
VERSION_STRING = 0.1
ENTRY_POINT = FdtPlatformEntryPoint
[Sources.common]
FdtPlatform.c
[Packages]
EmbeddedPkg/EmbeddedPkg.dec
ArmPkg/ArmPkg.dec
MdePkg/MdePkg.dec
[LibraryClasses]
UefiDriverEntryPoint
BdsLib
DxeServicesTableLib
BaseMemoryLib
DebugLib
UefiBootServicesTableLib
UefiRuntimeServicesTableLib
[Protocols]
gEfiDevicePathFromTextProtocolGuid
[Guids]
gEfiEndOfDxeEventGroupGuid
gFdtTableGuid
gFdtVariableGuid
[FeaturePcd]
gEmbeddedTokenSpaceGuid.PcdOverridePlatformFdt
[Pcd]
gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths
[Depex]
TRUE

50
EmbeddedPkg/Drivers/FdtPlatformDxe/README.txt Normal file
View File

@ -0,0 +1,50 @@
/** @file
Copyright (c) 2015, ARM Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
The purpose of the FdtPlatformDxe UEFI driver is to install the Flat Device
Tree (FDT) of the platform the UEFI frimware is running on into the UEFI
Configuration Table. The FDT is identified within the UEFI Configuration
Table by the "gFdtTableGuid" GUID defined in EmbeddedPkg.dec.
Once installed, an UEFI application or OS boot loader can get from the UEFI
Configuration Table the FDT of the platform from the "gFdtTableGuid" GUID.
The installation is done after each boot at the end of the DXE phase,
just before the BDS phase. It is done at the end of the DXE phase to be sure
that all drivers have been dispatched. That way, all UEFI protocols that may
be needed to retrieve the FDT can be made available. It is done before the BDS
phase to be able to provide the FDT during that phase.
The present driver tries to retrieve the FDT from the device paths defined in the
"gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths" PCD. The "PcdFdtDevicePaths" PCD
contains a list a device paths. The device paths are in the text form and
separated by semi-colons. The present driver tries the device paths in the order
it finds them in the "PcdFdtDevicePaths" PCD as long as he did not install
succesfully a FDT.
The "PcdFdtDevicePaths" PCD is a dynamic PCD that can be modified during the
DXE phase. This allows for exemple to select the right FDT when a binary is
intended to run on several platforms and/or variants of a platform.
If the driver manages to download a FDT from one of the device paths mentioned
above then it installs it in the UEFI Configuration table and the run over the
device paths is stopped.
For development purposes only, if the feature PCD "gEmbeddedTokenSpaceGuid.
PcdOverridePlatformFdt" is equal to TRUE, then before to try to install the
FDT from the device paths listed in the "PcdFdtDevicePaths" PCD, the present
driver tries to install it using the device path defined by the UEFI variable
"Fdt". If the variable does not exist or the installation using the device path
defined by the UEFI variable fails then the installation proceeds as described
above.

6
EmbeddedPkg/EmbeddedPkg.dec
View File

@ -52,6 +52,7 @@
## FDT Configuration Table
# Include/Guid/Fdt.h
gFdtTableGuid = { 0xb1b621d5, 0xf19c, 0x41a5, { 0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0 } }
gFdtVariableGuid = { 0x25a4fd4a, 0x9703, 0x4ba9, { 0xa1, 0x90, 0xb7, 0xc8, 0x4e, 0xfb, 0x3e, 0x57 } }
[Protocols.common]
gHardwareInterruptProtocolGuid = { 0x2890B3EA, 0x053D, 0x1643, { 0xAD, 0x0C, 0xD6, 0x48, 0x08, 0xDA, 0x3F, 0xF1 } }
@ -79,6 +80,7 @@
gEmbeddedTokenSpaceGuid.PcdPrePiProduceMemoryTypeInformationHob|FALSE|BOOLEAN|0x0000001b
gEmbeddedTokenSpaceGuid.PcdCacheEnable|FALSE|BOOLEAN|0x00000042
gEmbeddedTokenSpaceGuid.PcdGdbSerial|FALSE|BOOLEAN|0x00000053
gEmbeddedTokenSpaceGuid.PcdOverridePlatformFdt|TRUE|BOOLEAN|0x00000054
[PcdsFixedAtBuild.common]
@ -148,6 +150,7 @@
gEmbeddedTokenSpaceGuid.PcdAndroidFastbootUsbProductId|0xbeef|UINT32|0x00000023
gEmbeddedTokenSpaceGuid.PcdAndroidFastbootTcpPort|1234|UINT32|0x00000024
[PcdsFixedAtBuild.ARM]
gEmbeddedTokenSpaceGuid.PcdPrePiCpuMemorySize|32|UINT8|0x00000010
gEmbeddedTokenSpaceGuid.PcdPrePiCpuIoSize|0|UINT8|0x00000011
@ -169,3 +172,6 @@
[PcdsFixedAtBuild.X64]
gEmbeddedTokenSpaceGuid.PcdPrePiCpuMemorySize|52|UINT8|0x00000010
gEmbeddedTokenSpaceGuid.PcdPrePiCpuIoSize|16|UINT8|0x00000011
[PcdsFixedAtBuild.common, PcdsDynamic.common]
gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths|L""|VOID*|0x00000055

3
EmbeddedPkg/EmbeddedPkg.dsc
View File

@ -264,8 +264,9 @@
EmbeddedPkg/Universal/MmcDxe/MmcDxe.inf
# FDT Support
# FDT installation
EmbeddedPkg/Library/FdtLoadLib/FdtLoadLib.inf
EmbeddedPkg/Drivers/FdtPlatformDxe/FdtPlatformDxe.inf
EmbeddedPkg/Application/AndroidFastboot/AndroidFastbootApp.inf
EmbeddedPkg/Drivers/AndroidFastbootTransportUsbDxe/FastbootTransportUsbDxe.inf

11
EmbeddedPkg/Include/Guid/Fdt.h
View File

@ -12,12 +12,17 @@
*
**/
#ifndef __FDT_GUID_H__
#define __FDT_GUID_H__
#ifndef __FDT_H__
#define __FDT_H__
#define FDT_TABLE_GUID \
{ 0xb1b621d5, 0xf19c, 0x41a5, { 0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0 } }
extern EFI_GUID gFdtTableGuid;
#endif /* __FDT_GUID_H__ */
#define FDT_VARIABLE_GUID \
{ 0x25a4fd4a, 0x9703, 0x4ba9, { 0xa1, 0x90, 0xb7, 0xc8, 0x4e, 0xfb, 0x3e, 0x57 } }
extern EFI_GUID gFdtVariableGuid;
#endif /* __FDT_H__ */