![]() Run-time Services represent a minimum set of services primarily used to query and update non-volatile EFI settings. Boot Services provide the breadth of functionality offered by EFI for platform configuration, initialisation, diagnostics, OS kernel image loading and other functions. Intel first signalled that all that was about to change in early 2000, with the release of the first version of its Extensible Firmware Interface (EFI) specification, a proposed standard for the architecture, interface and services of a brand new type of PC firmware, designed to provide a well-specified set of services that are consistent across all platforms.ĮFI services are divided into two distinct groups, those that are available only before the operating system is loaded, known as Boot Services, and those that are also available after EFI has assumed its minimum footprint configuration, known as Runtime Services. ![]() ![]() ![]() The BIOS has evolved very little since the birth of the PC in 1981, remaining a chunk of hand-crafted assembly language code most users know only for the series of arcane configuration and test messages fleetingly displayed when they turn on their PC. ![]()
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