df851da3ce
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2446 There are many firmwares in the wild not supporting CreateEventEx, including devices less than 5 years old. Signed-off-by: Vitaly Cheptsov <vit9696@protonmail.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/** @file
|
|
UEFI Dxe DebugLib constructor that prevent some debug service after ExitBootServices event,
|
|
because some pointer is nulled at that phase.
|
|
|
|
Copyright (c) 2018, Microsoft Corporation
|
|
Copyright (c) 2015 - 2019, Intel Corporation. All rights reserved.<BR>
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
**/
|
|
|
|
#include <Uefi.h>
|
|
#include <Library/BaseLib.h>
|
|
#include <Library/BaseMemoryLib.h>
|
|
|
|
//
|
|
// BOOLEAN value to indicate if it is at the post ExitBootServices pahse
|
|
//
|
|
BOOLEAN mPostEBS = FALSE;
|
|
|
|
static EFI_EVENT mExitBootServicesEvent;
|
|
|
|
//
|
|
// Pointer to SystemTable
|
|
// This library instance may have a cycle consume with UefiBootServicesTableLib
|
|
// because of the constructors.
|
|
//
|
|
EFI_SYSTEM_TABLE *mDebugST;
|
|
|
|
/**
|
|
This routine sets the mPostEBS for exit boot servies true
|
|
to prevent DebugPort protocol dereferences when the pointer is nulled.
|
|
|
|
@param Event Event whose notification function is being invoked.
|
|
@param Context Pointer to the notification function's context.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
ExitBootServicesCallback (
|
|
EFI_EVENT Event,
|
|
VOID* Context
|
|
)
|
|
{
|
|
mPostEBS = TRUE;
|
|
return;
|
|
}
|
|
|
|
/**
|
|
The constructor gets the pointers to the system table.
|
|
And create a event to indicate it is after ExitBootServices.
|
|
|
|
@param ImageHandle The firmware allocated handle for the EFI image.
|
|
@param SystemTable A pointer to the EFI System Table.
|
|
|
|
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
DxeDebugLibConstructor(
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
mDebugST = SystemTable;
|
|
|
|
SystemTable->BootServices->CreateEvent (
|
|
EVT_SIGNAL_EXIT_BOOT_SERVICES,
|
|
TPL_NOTIFY,
|
|
ExitBootServicesCallback,
|
|
NULL,
|
|
&mExitBootServicesEvent
|
|
);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
The destructor closes Exit Boot Services Event.
|
|
|
|
@param ImageHandle The firmware allocated handle for the EFI image.
|
|
@param SystemTable A pointer to the EFI System Table.
|
|
|
|
@retval EFI_SUCCESS The destructor always returns EFI_SUCCESS.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
DxeDebugLibDestructor(
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
if (mExitBootServicesEvent != NULL) {
|
|
SystemTable->BootServices->CloseEvent (mExitBootServicesEvent);
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|