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