What is Runtime Services?
Quick note explaining Runtime Services for BIOS/UEFI and embedded firmware readers.
What is Runtime Services?
Runtime Services are UEFI services that remain callable after ExitBootServices(), such as variable, time, and reset services.
Why it matters
- Explains the core language used in BIOS/UEFI source and logs.
- Helps identify where a concept appears in the boot flow.
- Serves as a bridge between specification terms and real firmware debugging.
Practical example
Example: when reading a boot log, search for Runtime Services-related messages and note which phase produced them before jumping into source code.
Quick checklist
- Which phase is the last confirmed point in the log?
- Is there enough context around the failure?
- Can UEFI Shell output confirm the same state?
Quick takeaway
Runtime Services is a small concept, but it often becomes important when reading logs or debugging real firmware.
Related notes
- What is Boot Services?
- What is UEFI Variable?
- What is UEFI System Table?
- What is EfiRuntimeServicesData?
- What is UEFI Variable Store?
Public references
- UEFI Specification 2.11 — Runtime Services
- UEFI Specification 2.11
- UEFI PI Specification 1.9
- EDK II source code
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