MmServicesTableLib.c

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#include <PiMm.h>
#include <Protocol/MmBase.h>
#include <Library/MmServicesTableLib.h>
#include <Library/DebugLib.h>
 
EFI_MM_SYSTEM_TABLE  *gMmst = NULL;
 
EFI_STATUS
EFIAPI
MmServicesTableLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS            Status;
  EFI_MM_BASE_PROTOCOL  *InternalMmBase;
 
  InternalMmBase = NULL;
  //
  // Retrieve MM Base Protocol,  Do not use gBS from UefiBootServicesTableLib on purpose
  // to prevent inclusion of gBS, gST, and gImageHandle from SMM Drivers unless the
  // MM driver explicity declares that dependency.
  //
  Status = SystemTable->BootServices->LocateProtocol (
                                        &gEfiMmBaseProtocolGuid,
                                        NULL,
                                        (VOID **)&InternalMmBase
                                        );
  ASSERT_EFI_ERROR (Status);
  ASSERT (InternalMmBase != NULL);
 
  //
  // We are in MM, retrieve the pointer to MM System Table
  //
  InternalMmBase->GetMmstLocation (InternalMmBase, &gMmst);
  ASSERT (gMmst != NULL);
 
  return EFI_SUCCESS;
}