SmmServicesTableLib.c

Go to the documentation of this file.

 
#include <PiSmm.h>
#include <Protocol/SmmBase2.h>
#include <Library/SmmServicesTableLib.h>
#include <Library/DebugLib.h>
 
EFI_SMM_SYSTEM_TABLE2  *gSmst = NULL;
 
EFI_STATUS
EFIAPI
SmmServicesTableLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS              Status;
  EFI_SMM_BASE2_PROTOCOL  *InternalSmmBase2;
 
  InternalSmmBase2 = NULL;
  //
  // Retrieve SMM Base2 Protocol,  Do not use gBS from UefiBootServicesTableLib on purpose
  // to prevent inclusion of gBS, gST, and gImageHandle from SMM Drivers unless the
  // SMM driver explicitly declares that dependency.
  //
  Status = SystemTable->BootServices->LocateProtocol (
                                        &gEfiSmmBase2ProtocolGuid,
                                        NULL,
                                        (VOID **)&InternalSmmBase2
                                        );
  ASSERT_EFI_ERROR (Status);
  ASSERT (InternalSmmBase2 != NULL);
 
  //
  // We are in SMM, retrieve the pointer to SMM System Table
  //
  InternalSmmBase2->GetSmstLocation (InternalSmmBase2, &gSmst);
  ASSERT (gSmst != NULL);
 
  return EFI_SUCCESS;
}
 
BOOLEAN
EFIAPI
InSmm (
  VOID
  )
{
  //
  // We are already in SMM
  //
  return TRUE;
}