/** @file
Library functions that abstract areas of conflict between framework and UEFI 2.0.
Help Port Framework code that has conflicts with UEFI 2.0 by hiding the
old conflicts with library functions and supporting implementations of the old
(EDK/EFI 1.10) and new (EDK II/UEFI 2.0) way. This module is a DXE driver as
it contains DXE enum extensions for EFI event services.
Copyright (c) 2006 - 2008, Intel Corporation. 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 "UefiLibInternal.h"
/**
An empty function to pass error checking of CreateEventEx ().
This empty function ensures that EVT_NOTIFY_SIGNAL_ALL is error
checked correctly since it is now mapped into CreateEventEx() in UEFI 2.0.
@param Event Event whose notification function is being invoked.
@param Context The pointer to the notification function's context,
which is implementation-dependent.
**/
VOID
EFIAPI
InternalEmptyFunction (
IN EFI_EVENT Event,
IN VOID *Context
)
{
return;
}
/**
Creates an EFI event in the Legacy Boot Event Group.
Prior to UEFI 2.0 this was done via a non blessed UEFI extensions and this library
abstracts the implementation mechanism of this event from the caller. This function
abstracts the creation of the Legacy Boot Event. The Framework moved from a proprietary
to UEFI 2.0 based mechanism. This library abstracts the caller from how this event
is created to prevent to code form having to change with the version of the
specification supported.
If LegacyBootEvent is NULL, then ASSERT().
@param LegacyBootEvent Returns the EFI event returned from gBS->CreateEvent(Ex).
@retval EFI_SUCCESS Event was created.
@retval Other Event was not created.
**/
EFI_STATUS
EFIAPI
EfiCreateEventLegacyBoot (
OUT EFI_EVENT *LegacyBootEvent
)
{
return EfiCreateEventLegacyBootEx (
TPL_CALLBACK,
InternalEmptyFunction,
NULL,
LegacyBootEvent
);
}
/**
Create an EFI event in the Legacy Boot Event Group and allows
the caller to specify a notification function.
This function abstracts the creation of the Legacy Boot Event.
The Framework moved from a proprietary to UEFI 2.0 based mechanism.
This library abstracts the caller from how this event is created to prevent
to code form having to change with the version of the specification supported.
If LegacyBootEvent is NULL, then ASSERT().
@param NotifyTpl The task priority level of the event.
@param NotifyFunction The notification function to call when the event is signaled.
@param NotifyContext The content to pass to NotifyFunction when the event is signaled.
@param LegacyBootEvent Returns the EFI event returned from gBS->CreateEvent(Ex).
@retval EFI_SUCCESS Event was created.
@retval Other Event was not created.
**/
EFI_STATUS
EFIAPI
EfiCreateEventLegacyBootEx (
IN EFI_TPL NotifyTpl,
IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL
IN VOID *NotifyContext, OPTIONAL
OUT EFI_EVENT *LegacyBootEvent
)
{
EFI_STATUS Status;
EFI_EVENT_NOTIFY WorkerNotifyFunction;
ASSERT (LegacyBootEvent != NULL);
if (gST->Hdr.Revision < EFI_2_00_SYSTEM_TABLE_REVISION) {
DEBUG ((EFI_D_ERROR, "EFI1.1 can't support LegacyBootEvent!"));
ASSERT (FALSE);
return EFI_UNSUPPORTED;
} else {
//
// For UEFI 2.0 and the future use an Event Group
//
if (NotifyFunction == NULL) {
//
// CreateEventEx will check NotifyFunction is NULL or not and return error.
// Use dummy routine for the case NotifyFunction is NULL.
//
WorkerNotifyFunction = InternalEmptyFunction;
} else {
WorkerNotifyFunction = NotifyFunction;
}
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
NotifyTpl,
WorkerNotifyFunction,
NotifyContext,
&gEfiEventLegacyBootGuid,
LegacyBootEvent
);
}
return Status;
}
/**
Create an EFI event in the Ready To Boot Event Group.
Prior to UEFI 2.0 this was done via a non-standard UEFI extension, and this library
abstracts the implementation mechanism of this event from the caller.
This function abstracts the creation of the Ready to Boot Event. The Framework
moved from a proprietary to UEFI 2.0-based mechanism. This library abstracts
the caller from how this event is created to prevent the code form having to
change with the version of the specification supported.
If ReadyToBootEvent is NULL, then ASSERT().
@param ReadyToBootEvent Returns the EFI event returned from gBS->CreateEvent(Ex).
@retval EFI_SUCCESS Event was created.
@retval Other Event was not created.
**/
EFI_STATUS
EFIAPI
EfiCreateEventReadyToBoot (
OUT EFI_EVENT *ReadyToBootEvent
)
{
return EfiCreateEventReadyToBootEx (
TPL_CALLBACK,
InternalEmptyFunction,
NULL,
ReadyToBootEvent
);
}
/**
Create an EFI event in the Ready To Boot Event Group and allows
the caller to specify a notification function.
This function abstracts the creation of the Ready to Boot Event.
The Framework moved from a proprietary to UEFI 2.0 based mechanism.
This library abstracts the caller from how this event is created to prevent
to code form having to change with the version of the specification supported.
If ReadyToBootEvent is NULL, then ASSERT().
@param NotifyTpl The task priority level of the event.
@param NotifyFunction The notification function to call when the event is signaled.
@param NotifyContext The content to pass to NotifyFunction when the event is signaled.
@param ReadyToBootEvent Returns the EFI event returned from gBS->CreateEvent(Ex).
@retval EFI_SUCCESS Event was created.
@retval Other Event was not created.
**/
EFI_STATUS
EFIAPI
EfiCreateEventReadyToBootEx (
IN EFI_TPL NotifyTpl,
IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL
IN VOID *NotifyContext, OPTIONAL
OUT EFI_EVENT *ReadyToBootEvent
)
{
EFI_STATUS Status;
EFI_EVENT_NOTIFY WorkerNotifyFunction;
ASSERT (ReadyToBootEvent != NULL);
if (gST->Hdr.Revision < EFI_2_00_SYSTEM_TABLE_REVISION) {
DEBUG ((EFI_D_ERROR, "EFI1.1 can't support ReadyToBootEvent!"));
ASSERT (FALSE);
return EFI_UNSUPPORTED;
} else {
//
// For UEFI 2.0 and the future use an Event Group
//
if (NotifyFunction == NULL) {
//
// CreateEventEx will check NotifyFunction is NULL or not and return error.
// Use dummy routine for the case NotifyFunction is NULL.
//
WorkerNotifyFunction = InternalEmptyFunction;
} else {
WorkerNotifyFunction = NotifyFunction;
}
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
NotifyTpl,
WorkerNotifyFunction,
NotifyContext,
&gEfiEventReadyToBootGuid,
ReadyToBootEvent
);
}
return Status;
}
/**
Create, Signal, and Close the Ready to Boot event using EfiSignalEventReadyToBoot().
This function abstracts the signaling of the Ready to Boot Event. The Framework moved
from a proprietary to UEFI 2.0 based mechanism. This library abstracts the caller
from how this event is created to prevent to code form having to change with the
version of the specification supported.
**/
VOID
EFIAPI
EfiSignalEventReadyToBoot (
VOID
)
{
EFI_STATUS Status;
EFI_EVENT ReadyToBootEvent;
Status = EfiCreateEventReadyToBoot (&ReadyToBootEvent);
if (!EFI_ERROR (Status)) {
gBS->SignalEvent (ReadyToBootEvent);
gBS->CloseEvent (ReadyToBootEvent);
}
}
/**
Create, Signal, and Close the Ready to Boot event using EfiSignalEventLegacyBoot().
This function abstracts the signaling of the Legacy Boot Event. The Framework moved from
a proprietary to UEFI 2.0 based mechanism. This library abstracts the caller from how
this event is created to prevent to code form having to change with the version of the
specification supported.
**/
VOID
EFIAPI
EfiSignalEventLegacyBoot (
VOID
)
{
EFI_STATUS Status;
EFI_EVENT LegacyBootEvent;
Status = EfiCreateEventLegacyBoot (&LegacyBootEvent);
if (!EFI_ERROR (Status)) {
gBS->SignalEvent (LegacyBootEvent);
gBS->CloseEvent (LegacyBootEvent);
}
}
/**
Check to see if the Firmware Volume (FV) Media Device Path is valid
The Framework FwVol Device Path changed to conform to the UEFI 2.0 specification.
This library function abstracts validating a device path node.
Check the MEDIA_FW_VOL_FILEPATH_DEVICE_PATH data structure to see if it's valid.
If it is valid, then return the GUID file name from the device path node. Otherwise,
return NULL. This device path changed in the DXE CIS version 0.92 in a non back ward
compatible way to not conflict with the UEFI 2.0 specification. This function abstracts
the differences from the caller.
If FvDevicePathNode is NULL, then ASSERT().
@param FvDevicePathNode The pointer to FV device path to check.
@retval NULL FvDevicePathNode is not valid.
@retval Other FvDevicePathNode is valid and pointer to NameGuid was returned.
**/
EFI_GUID *
EFIAPI
EfiGetNameGuidFromFwVolDevicePathNode (
IN CONST MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FvDevicePathNode
)
{
ASSERT (FvDevicePathNode != NULL);
if (DevicePathType (&FvDevicePathNode->Header) == MEDIA_DEVICE_PATH &&
DevicePathSubType (&FvDevicePathNode->Header) == MEDIA_PIWG_FW_FILE_DP) {
return (EFI_GUID *) &FvDevicePathNode->FvFileName;
}
return NULL;
}
/**
Initialize a Firmware Volume (FV) Media Device Path node.
The Framework FwVol Device Path changed to conform to the UEFI 2.0 specification.
This library function abstracts initializing a device path node.
Initialize the MEDIA_FW_VOL_FILEPATH_DEVICE_PATH data structure. This device
path changed in the DXE CIS version 0.92 in a non back ward compatible way to
not conflict with the UEFI 2.0 specification. This function abstracts the
differences from the caller.
If FvDevicePathNode is NULL, then ASSERT().
If NameGuid is NULL, then ASSERT().
@param FvDevicePathNode The pointer to a FV device path node to initialize
@param NameGuid FV file name to use in FvDevicePathNode
**/
VOID
EFIAPI
EfiInitializeFwVolDevicepathNode (
IN OUT MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FvDevicePathNode,
IN CONST EFI_GUID *NameGuid
)
{
ASSERT (FvDevicePathNode != NULL);
ASSERT (NameGuid != NULL);
//
// Use the new Device path that does not conflict with the UEFI
//
FvDevicePathNode->Header.Type = MEDIA_DEVICE_PATH;
FvDevicePathNode->Header.SubType = MEDIA_PIWG_FW_FILE_DP;
SetDevicePathNodeLength (&FvDevicePathNode->Header, sizeof (MEDIA_FW_VOL_FILEPATH_DEVICE_PATH));
CopyGuid (&FvDevicePathNode->FvFileName, NameGuid);
}