OvmfPkg/Csm/LegacyBiosDxe: Fix Legacy16GetTableAddress call for E820 data

[mirror_edk2.git] / OvmfPkg / SmmAccess / SmmAccess2Dxe.c

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