ACPI_EBDA_WINDOW_SIZE
mapp = AcpiOsMapMemory(physaddr, ACPI_EBDA_WINDOW_SIZE);
AcpiTbScanMemoryForRsdp(mapp, ACPI_EBDA_WINDOW_SIZE));
AcpiOsUnmapMemory(mapp, ACPI_EBDA_WINDOW_SIZE);
AcpiOsUnmapMemory(mapp, ACPI_EBDA_WINDOW_SIZE);
ACPI_EBDA_WINDOW_SIZE);
PhysicalAddress, ACPI_EBDA_WINDOW_SIZE));
TablePtr, ACPI_EBDA_WINDOW_SIZE);
AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_WINDOW_SIZE);
rsdp = scan_rsdp(&paddr, ACPI_EBDA_WINDOW_SIZE);