What is ConvertPointer?
Quick note explaining ConvertPointer for BIOS/UEFI and embedded firmware readers.
What is ConvertPointer?
ConvertPointer is a UEFI memory-management concept used around memory maps, runtime mapping, and the OS handoff.
Why it matters
- Explains memory ownership around the firmware-to-OS transition.
- Helps debug ExitBootServices(), runtime mapping, and memory-type issues.
- Useful when reading UEFI memory maps.
Practical example
Example: ExitBootServices() can fail if the memory map changes after GetMemoryMap(). In that case, retrieve the map again and use the new key.
Quick checklist
- Is the memory type correct for its lifetime?
- Does the map change before ExitBootServices()?
- Are runtime pointers converted after SetVirtualAddressMap()?
Quick takeaway
ConvertPointer is about memory ownership during the handoff from firmware to the OS.
Related notes
- What is SetVirtualAddressMap?
- What is Memory Map Key?
- What is EfiRuntimeServicesData?
- What is EfiBootServicesData?
- What is EFI_MEMORY_TYPE?
Public references
- UEFI Specification 2.11 — Boot Services / Memory
- UEFI Specification 2.11 — Runtime Services
- EDK II MdePkg UefiSpec.h
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