rsdp_phys = acpi_scan_rsdp (0xE0000, 0xFFFFF);
rsdp_phys = acpi_scan_rsdp (0xE0000, 0x20000);
acpi_find_rsdp (void){	unsigned long		rsdp_phys = 0;	if (efi_enabled) {		if (efi.acpi20)			return __pa(efi.acpi20);		else if (efi.acpi)			return __pa(efi.acpi);	}	/*	 * Scan memory looking for the RSDP signature. First search EBDA (low	 * memory) paragraphs and then search upper memory (E0000-FFFFF).	 */	rsdp_phys = acpi_scan_rsdp (0, 0x400);	if (!rsdp_phys)		rsdp_phys = acpi_scan_rsdp (0xE0000, 0xFFFFF);	return rsdp_phys;}