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/** @file
Library functions that abstract areas of conflict between Tiano an UEFI 2.1.
Help Port Framework/Tinao code that has conflicts with UEFI 2.1 by hiding the
oldconflicts with library functions and supporting implementations of the old
(EDK/EFI 1.10) and new (EDK II/UEFI 2.1) way. This module is a DXE driver as
it contains DXE enum extensions for EFI event services.
Copyright (c) 2007, Intel Corporation<BR>
All rights reserved. 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 "UefiLibFramework.h"
/**
An empty function to pass error checking of CreateEventEx ().
This empty function ensures that EFI_EVENT_NOTIFY_SIGNAL_ALL is error
checked correctly since it is now mapped into CreateEventEx() in UEFI 2.0.
**/
STATIC
VOID
EFIAPI
InternalEmptyFuntion (
IN EFI_EVENT Event,
IN VOID *Context
)
{
return;
}
/**
Create a Legacy Boot Event.
Tiano extended the CreateEvent Type enum to add a legacy boot event type.
This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was
added and now it's possible to not voilate the UEFI specification by
declaring a GUID for the legacy boot event class. This library supports
the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to
work both ways.
@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,
InternalEmptyFuntion,
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;
ASSERT (LegacyBootEvent != NULL);
if (gST->Hdr.Revision < 0x00020000) {
//
// prior to UEFI 2.0 use Tiano extension to EFI
//
Status = gBS->CreateEvent (
EFI_EVENT_SIGNAL_LEGACY_BOOT | EVT_NOTIFY_SIGNAL,
NotifyTpl,
NotifyFunction,
NotifyContext,
LegacyBootEvent
);
} else {
//
// For UEFI 2.0 and the future use an Event Group
//
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
NotifyTpl,
NotifyFunction,
NotifyContext,
&gEfiEventLegacyBootGuid,
LegacyBootEvent
);
}
return Status;
}
/**
Create a Read to Boot Event.
Tiano extended the CreateEvent Type enum to add a ready to boot event type.
This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was
added and now it's possible to not voilate the UEFI specification and use
the ready to boot event class defined in UEFI 2.0. This library supports
the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to
work both ways.
@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
EfiCreateEventReadyToBoot (
OUT EFI_EVENT *ReadyToBootEvent
)
{
return EfiCreateEventReadyToBootEx (
TPL_CALLBACK,
InternalEmptyFuntion,
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 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
EfiCreateEventReadyToBootEx (
IN EFI_TPL NotifyTpl,
IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL
IN VOID *NotifyContext, OPTIONAL
OUT EFI_EVENT *ReadyToBootEvent
)
{
EFI_STATUS Status;
ASSERT (ReadyToBootEvent != NULL);
if (gST->Hdr.Revision < 0x00020000) {
//
// prior to UEFI 2.0 use Tiano extension to EFI
//
Status = gBS->CreateEvent (
EFI_EVENT_SIGNAL_READY_TO_BOOT | EFI_EVENT_NOTIFY_SIGNAL_ALL,
NotifyTpl,
NotifyFunction,
NotifyContext,
ReadyToBootEvent
);
} else {
//
// For UEFI 2.0 and the future use an Event Group
//
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
NotifyTpl,
NotifyFunction,
NotifyContext,
&gEfiEventReadyToBootGuid,
ReadyToBootEvent
);
}
return Status;
}
/**
Signal a Ready to Boot Event.
Create a Ready to Boot Event. Signal it and close it. This causes other
events of the same event group to be signaled in other modules.
**/
VOID
EFIAPI
EfiSignalEventReadyToBoot (
VOID
)
{
EFI_STATUS Status;
EFI_EVENT ReadyToBootEvent;
Status = EfiCreateEventReadyToBoot (&ReadyToBootEvent);
if (!EFI_ERROR (Status)) {
gBS->SignalEvent (ReadyToBootEvent);
gBS->CloseEvent (ReadyToBootEvent);
}
}
/**
Signal a Legacy Boot Event.
Create a legacy Boot Event. Signal it and close it. This causes other
events of the same event group to be signaled in other modules.
**/
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
Tiano extended the EFI 1.10 device path nodes. Tiano does not own this enum
so as we move to UEFI 2.0 support we must use a mechanism that conforms with
the UEFI 2.0 specification to define the FV device path. An UEFI GUIDed
device path is defined for Tiano extensions of device path. If the code
is compiled to conform with the UEFI 2.0 specification use the new device path
else use the old form for backwards compatability. The return value to this
function points to a location in FvDevicePathNode and it does not allocate
new memory for the GUID pointer that is returned.
@param FvDevicePathNode 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);
//
// Use the new Device path that does not conflict with the UEFI
//
if (FvDevicePathNode->Tiano.Header.Type == MEDIA_DEVICE_PATH ||
FvDevicePathNode->Tiano.Header.SubType == MEDIA_VENDOR_DP) {
if (CompareGuid (&gEfiFrameworkDevicePathGuid, &FvDevicePathNode->Tiano.TianoSpecificDevicePath)) {
if (FvDevicePathNode->Tiano.Type == TIANO_MEDIA_FW_VOL_FILEPATH_DEVICE_PATH_TYPE) {
return (EFI_GUID *) &FvDevicePathNode->NameGuid;
}
}
}
return NULL;
}
/**
Initialize a Firmware Volume (FV) Media Device Path node.
Tiano extended the EFI 1.10 device path nodes. Tiano does not own this enum
so as we move to UEFI 2.0 support we must use a mechanism that conforms with
the UEFI 2.0 specification to define the FV device path. An UEFI GUIDed
device path is defined for Tiano extensions of device path. If the code
is compiled to conform with the UEFI 2.0 specification use the new device path
else use the old form for backwards compatability.
@param FvDevicePathNode 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->Tiano.Header.Type = MEDIA_DEVICE_PATH;
FvDevicePathNode->Tiano.Header.SubType = MEDIA_VENDOR_DP;
SetDevicePathNodeLength (&FvDevicePathNode->Tiano.Header, sizeof (MEDIA_FW_VOL_FILEPATH_DEVICE_PATH));
//
// Add the GUID for generic Tiano device paths
//
CopyGuid (&FvDevicePathNode->Tiano.TianoSpecificDevicePath, &gEfiFrameworkDevicePathGuid);
//
// Add in the FW Vol File Path Tiano defined information
//
FvDevicePathNode->Tiano.Type = TIANO_MEDIA_FW_VOL_FILEPATH_DEVICE_PATH_TYPE;
CopyGuid (&FvDevicePathNode->NameGuid, NameGuid);
}
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