/**
Initialize DMA protection.
**/
VOID
InitializeDmaProtection (
VOID
)
{
EFI_STATUS Status;
EFI_EVENT ExitBootServicesEvent;
EFI_EVENT LegacyBootEvent;
EFI_EVENT EventAcpi10;
EFI_EVENT EventAcpi20;
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
VTD_TPL_LEVEL,
AcpiNotificationFunc,
NULL,
&gEfiAcpi10TableGuid,
&EventAcpi10
);
ASSERT_EFI_ERROR (Status);
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
VTD_TPL_LEVEL,
AcpiNotificationFunc,
NULL,
&gEfiAcpi20TableGuid,
&EventAcpi20
);
ASSERT_EFI_ERROR (Status);
//
// Signal the events initially for the case
// that DMAR table has been installed.
//
gBS->SignalEvent (EventAcpi20);
gBS->SignalEvent (EventAcpi10);
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
OnExitBootServices,
NULL,
&gEfiEventExitBootServicesGuid,
&ExitBootServicesEvent
);
ASSERT_EFI_ERROR (Status);
Status = EfiCreateEventLegacyBootEx (
TPL_CALLBACK,
OnLegacyBoot,
NULL,
&LegacyBootEvent
);
ASSERT_EFI_ERROR (Status);
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
);
}
