SIZEOF_RSDP_REV_0
read(acpi_mem_fd, &rp, SIZEOF_RSDP_REV_0);
sizeof(struct ACPIrsdp) - SIZEOF_RSDP_REV_0);
if (acpi_checksum(&rp, SIZEOF_RSDP_REV_0) == 0)
return (acpi_map_physical(pa, SIZEOF_RSDP_REV_0));