bf428cb388
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6797 6f19259b-4bc3-4df7-8a09-765794883524
366 lines
12 KiB
C
366 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 - 2007, Intel Corporation<BR>
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All rights reserved. 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 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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InternalEmptyFuntion (
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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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Create a Legacy Boot Event.
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Tiano extended the CreateEvent Type enum to add a legacy boot event type.
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This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was
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added and now it's possible to not voilate the UEFI specification by
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declaring a GUID for the legacy boot event class. This library supports
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the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to
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work both ways.
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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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InternalEmptyFuntion,
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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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ASSERT (LegacyBootEvent != NULL);
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if (gST->Hdr.Revision < 0x00020000) {
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//
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// prior to UEFI 2.0 use Tiano extension to EFI
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//
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Status = gBS->CreateEvent (
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EFI_EVENT_SIGNAL_LEGACY_BOOT | EVT_NOTIFY_SIGNAL,
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NotifyTpl,
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NotifyFunction,
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NotifyContext,
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LegacyBootEvent
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);
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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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Status = gBS->CreateEventEx (
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EVT_NOTIFY_SIGNAL,
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NotifyTpl,
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NotifyFunction,
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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 a Read to Boot Event.
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Tiano extended the CreateEvent Type enum to add a ready to boot event type.
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This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was
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added and now it's possible to not voilate the UEFI specification and use
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the ready to boot event class defined in UEFI 2.0. This library supports
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the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to
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work both ways.
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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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InternalEmptyFuntion,
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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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ASSERT (ReadyToBootEvent != NULL);
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if (gST->Hdr.Revision < 0x00020000) {
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//
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// prior to UEFI 2.0 use Tiano extension to EFI
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//
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Status = gBS->CreateEvent (
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EFI_EVENT_SIGNAL_READY_TO_BOOT | EFI_EVENT_NOTIFY_SIGNAL_ALL,
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NotifyTpl,
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NotifyFunction,
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NotifyContext,
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ReadyToBootEvent
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);
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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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Status = gBS->CreateEventEx (
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EVT_NOTIFY_SIGNAL,
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NotifyTpl,
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NotifyFunction,
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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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Signal a Ready to Boot Event.
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Create a Ready to Boot Event. Signal it and close it. This causes other
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events of the same event group to be signaled in other modules.
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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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Signal a Legacy Boot Event.
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Create a legacy Boot Event. Signal it and close it. This causes other
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events of the same event group to be signaled in other modules.
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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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Tiano extended the EFI 1.10 device path nodes. Tiano does not own this enum
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so as we move to UEFI 2.0 support we must use a mechanism that conforms with
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the UEFI 2.0 specification to define the FV device path. An UEFI GUIDed
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device path is defined for Tiano extensions of device path. If the code
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is compiled to conform with the UEFI 2.0 specification use the new device path
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else use the old form for backwards compatability. The return value to this
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function points to a location in FvDevicePathNode and it does not allocate
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new memory for the GUID pointer that is returned.
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@param FvDevicePathNode 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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FRAMEWORK_MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FrameworkFvDevicePathNode;
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ASSERT (FvDevicePathNode != NULL);
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FrameworkFvDevicePathNode = (FRAMEWORK_MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *) FvDevicePathNode;
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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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if (DevicePathType (&FrameworkFvDevicePathNode->Tiano.Header) == MEDIA_DEVICE_PATH &&
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DevicePathSubType (&FrameworkFvDevicePathNode->Tiano.Header) == MEDIA_VENDOR_DP) {
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if (CompareGuid (&gEfiFrameworkDevicePathGuid, &FrameworkFvDevicePathNode->Tiano.TianoSpecificDevicePath)) {
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if (FrameworkFvDevicePathNode->Tiano.Type == TIANO_MEDIA_FW_VOL_FILEPATH_DEVICE_PATH_TYPE) {
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return (EFI_GUID *) &FrameworkFvDevicePathNode->NameGuid;
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}
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}
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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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Tiano extended the EFI 1.10 device path nodes. Tiano does not own this enum
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so as we move to UEFI 2.0 support we must use a mechanism that conforms with
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the UEFI 2.0 specification to define the FV device path. An UEFI GUIDed
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device path is defined for Tiano extensions of device path. If the code
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is compiled to conform with the UEFI 2.0 specification use the new device path
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else use the old form for backwards compatability.
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@param FvDevicePathNode 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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FRAMEWORK_MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FrameworkFvDevicePathNode;
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ASSERT (FvDevicePathNode != NULL);
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ASSERT (NameGuid != NULL);
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FrameworkFvDevicePathNode = (FRAMEWORK_MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *) FvDevicePathNode;
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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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FrameworkFvDevicePathNode->Tiano.Header.Type = MEDIA_DEVICE_PATH;
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FrameworkFvDevicePathNode->Tiano.Header.SubType = MEDIA_VENDOR_DP;
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SetDevicePathNodeLength (&FrameworkFvDevicePathNode->Tiano.Header, sizeof (MEDIA_FW_VOL_FILEPATH_DEVICE_PATH));
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//
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// Add the GUID for generic Tiano device paths
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//
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CopyGuid (&FrameworkFvDevicePathNode->Tiano.TianoSpecificDevicePath, &gEfiFrameworkDevicePathGuid);
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//
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// Add in the FW Vol File Path Tiano defined information
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//
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FrameworkFvDevicePathNode->Tiano.Type = TIANO_MEDIA_FW_VOL_FILEPATH_DEVICE_PATH_TYPE;
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CopyGuid (&FrameworkFvDevicePathNode->NameGuid, NameGuid);
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}
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