Function LoadAndInjectDSDT

rEFIt_UEFI/Platform/AcpiPatcher.cpp:2298–2335

* Searches for DSDT in AcpiOemPath or PathPatched dirs and inserts it * to FadtPointer if found. */

 * to FadtPointer if found.
 */
EFI_STATUS LoadAndInjectDSDT(CONST CHAR16 *PathPatched,
                             EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *FadtPointer)
{
  EFI_STATUS            Status;
  UINT8                 *Buffer = NULL;
  UINTN                  BufferLen = 0;
  EFI_PHYSICAL_ADDRESS  Dsdt;

  // load if exists
  Status = LoadAcpiTable(PathPatched, gSettings.DsdtName.wc_str(), &Buffer, &BufferLen);

  if (!EFI_ERROR(Status)) {
    // loaded - allocate EfiACPIReclaim
    DBG("Loaded DSDT at %ls\\%ls\n", PathPatched, gSettings.DsdtName.wc_str());
    Dsdt = EFI_SYSTEM_TABLE_MAX_ADDRESS; //0xFE000000;
    Status = gBS->AllocatePages (
                                 AllocateMaxAddress,
                                 EfiACPIReclaimMemory,
                                 EFI_SIZE_TO_PAGES(BufferLen),
                                 &Dsdt
                                 );

    if(!EFI_ERROR(Status)) {
      // copy DSDT into EfiACPIReclaim block
      CopyMem((VOID*)(UINTN)Dsdt, Buffer, BufferLen);

      // update FADT
      FadtPointer->Dsdt  = (UINT32)Dsdt;
      FadtPointer->XDsdt = Dsdt;
      FixChecksum(&FadtPointer->Header);
		DBG("DSDT at 0x%llX injected to FADT 0x%p\n", Dsdt, FadtPointer);
    }

    FreePool(Buffer);
  }

  return Status;
}

/**
 * Searches for TableName in AcpiOemPath or PathPatched dirs and inserts it