mirror of https://github.com/acidanthera/audk.git
159 lines
4.6 KiB
C
159 lines
4.6 KiB
C
/** @file
|
|
|
|
A DXE_DRIVER providing SMRAM access by producing EFI_SMM_ACCESS2_PROTOCOL.
|
|
|
|
Q35 TSEG is expected to have been verified and set up by the SmmAccessPei
|
|
driver.
|
|
|
|
Copyright (C) 2013, 2015, Red Hat, Inc.<BR>
|
|
Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include <Library/DebugLib.h>
|
|
#include <Library/PcdLib.h>
|
|
#include <Library/UefiBootServicesTableLib.h>
|
|
#include <Protocol/SmmAccess2.h>
|
|
|
|
#include "SmramInternal.h"
|
|
|
|
/**
|
|
Opens the SMRAM area to be accessible by a boot-service driver.
|
|
|
|
This function "opens" SMRAM so that it is visible while not inside of SMM.
|
|
The function should return EFI_UNSUPPORTED if the hardware does not support
|
|
hiding of SMRAM. The function should return EFI_DEVICE_ERROR if the SMRAM
|
|
configuration is locked.
|
|
|
|
@param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
|
|
|
|
@retval EFI_SUCCESS The operation was successful.
|
|
@retval EFI_UNSUPPORTED The system does not support opening and closing of
|
|
SMRAM.
|
|
@retval EFI_DEVICE_ERROR SMRAM cannot be opened, perhaps because it is
|
|
locked.
|
|
**/
|
|
STATIC
|
|
EFI_STATUS
|
|
EFIAPI
|
|
SmmAccess2DxeOpen (
|
|
IN EFI_SMM_ACCESS2_PROTOCOL *This
|
|
)
|
|
{
|
|
return SmramAccessOpen (&This->LockState, &This->OpenState);
|
|
}
|
|
|
|
/**
|
|
Inhibits access to the SMRAM.
|
|
|
|
This function "closes" SMRAM so that it is not visible while outside of SMM.
|
|
The function should return EFI_UNSUPPORTED if the hardware does not support
|
|
hiding of SMRAM.
|
|
|
|
@param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
|
|
|
|
@retval EFI_SUCCESS The operation was successful.
|
|
@retval EFI_UNSUPPORTED The system does not support opening and closing of
|
|
SMRAM.
|
|
@retval EFI_DEVICE_ERROR SMRAM cannot be closed.
|
|
**/
|
|
STATIC
|
|
EFI_STATUS
|
|
EFIAPI
|
|
SmmAccess2DxeClose (
|
|
IN EFI_SMM_ACCESS2_PROTOCOL *This
|
|
)
|
|
{
|
|
return SmramAccessClose (&This->LockState, &This->OpenState);
|
|
}
|
|
|
|
/**
|
|
Inhibits access to the SMRAM.
|
|
|
|
This function prohibits access to the SMRAM region. This function is usually
|
|
implemented such that it is a write-once operation.
|
|
|
|
@param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
|
|
|
|
@retval EFI_SUCCESS The device was successfully locked.
|
|
@retval EFI_UNSUPPORTED The system does not support locking of SMRAM.
|
|
**/
|
|
STATIC
|
|
EFI_STATUS
|
|
EFIAPI
|
|
SmmAccess2DxeLock (
|
|
IN EFI_SMM_ACCESS2_PROTOCOL *This
|
|
)
|
|
{
|
|
return SmramAccessLock (&This->LockState, &This->OpenState);
|
|
}
|
|
|
|
/**
|
|
Queries the memory controller for the possible regions that will support
|
|
SMRAM.
|
|
|
|
@param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.
|
|
@param[in,out] SmramMapSize A pointer to the size, in bytes, of the
|
|
SmramMemoryMap buffer.
|
|
@param[in,out] SmramMap A pointer to the buffer in which firmware
|
|
places the current memory map.
|
|
|
|
@retval EFI_SUCCESS The chipset supported the given resource.
|
|
@retval EFI_BUFFER_TOO_SMALL The SmramMap parameter was too small. The
|
|
current buffer size needed to hold the memory
|
|
map is returned in SmramMapSize.
|
|
**/
|
|
STATIC
|
|
EFI_STATUS
|
|
EFIAPI
|
|
SmmAccess2DxeGetCapabilities (
|
|
IN CONST EFI_SMM_ACCESS2_PROTOCOL *This,
|
|
IN OUT UINTN *SmramMapSize,
|
|
IN OUT EFI_SMRAM_DESCRIPTOR *SmramMap
|
|
)
|
|
{
|
|
return SmramAccessGetCapabilities (This->LockState, This->OpenState,
|
|
SmramMapSize, SmramMap);
|
|
}
|
|
|
|
//
|
|
// LockState and OpenState will be filled in by the entry point.
|
|
//
|
|
STATIC EFI_SMM_ACCESS2_PROTOCOL mAccess2 = {
|
|
&SmmAccess2DxeOpen,
|
|
&SmmAccess2DxeClose,
|
|
&SmmAccess2DxeLock,
|
|
&SmmAccess2DxeGetCapabilities
|
|
};
|
|
|
|
//
|
|
// Entry point of this driver.
|
|
//
|
|
EFI_STATUS
|
|
EFIAPI
|
|
SmmAccess2DxeEntryPoint (
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
//
|
|
// This module should only be included if SMRAM support is required.
|
|
//
|
|
ASSERT (FeaturePcdGet (PcdSmmSmramRequire));
|
|
|
|
InitQ35TsegMbytes ();
|
|
GetStates (&mAccess2.LockState, &mAccess2.OpenState);
|
|
|
|
//
|
|
// SmramAccessLock() depends on "mQ35SmramAtDefaultSmbase"; init the latter
|
|
// just before exposing the former via EFI_SMM_ACCESS2_PROTOCOL.Lock().
|
|
//
|
|
InitQ35SmramAtDefaultSmbase ();
|
|
|
|
return gBS->InstallMultipleProtocolInterfaces (&ImageHandle,
|
|
&gEfiSmmAccess2ProtocolGuid, &mAccess2,
|
|
NULL);
|
|
}
|