acpi_md_OsGetRootPointer
rv = acpi_md_OsMapMemory(acpi_md_OsGetRootPointer(), sizeof(*rsdp), (void **)&rsdp);
ACPI_PHYSICAL_ADDRESS acpi_md_OsGetRootPointer(void);
rsdp_phys = acpi_md_OsGetRootPointer();
rsdp_phys = acpi_md_OsGetRootPointer();
ACPI_PHYSICAL_ADDRESS acpi_md_OsGetRootPointer(void);
ACPI_PHYSICAL_ADDRESS acpi_md_OsGetRootPointer(void);
PhysicalAddress = acpi_md_OsGetRootPointer();