SmmAccess2Dxe.c

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#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/SmmAccess2.h>
 
#include "SmramInternal.h"
 
STATIC
EFI_STATUS
EFIAPI
SmmAccess2DxeOpen (
  IN EFI_SMM_ACCESS2_PROTOCOL  *This
  )
{
  return SmramAccessOpen (&This->LockState, &This->OpenState);
}
 
STATIC
EFI_STATUS
EFIAPI
SmmAccess2DxeClose (
  IN EFI_SMM_ACCESS2_PROTOCOL  *This
  )
{
  return SmramAccessClose (&This->LockState, &This->OpenState);
}
 
STATIC
EFI_STATUS
EFIAPI
SmmAccess2DxeLock (
  IN EFI_SMM_ACCESS2_PROTOCOL  *This
  )
{
  return SmramAccessLock (&This->LockState, &This->OpenState);
}
 
STATIC
EFI_STATUS
EFIAPI
SmmAccess2DxeGetCapabilities (
  IN CONST EFI_SMM_ACCESS2_PROTOCOL  *This,
  IN OUT UINTN                       *SmramMapSize,
  IN OUT EFI_SMRAM_DESCRIPTOR        *SmramMap
  )
{
  return SmramAccessGetCapabilities (
           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
                );
}