Good morning,
1.) Do you mean whether the OS exposes the Runtime Services? Windows and Linux
expose the Variable Services (Linux even more, if I remember correctly) and
macOS (not entirely sure about the latest version) the entire table via
DeviceTree.
2.) Yes, you need to write a DXE Runtime Driver. One way to do it is install an
UEFI Protocol and let the UEFI OS loader store its address (pay attention to
allocate the structure from Runtime memory, update the pointers when going
virtual and not use any Boot Services), another is to use the UEFI
Configuration Table. Though remember that the OS still has hardware ownership,
you might need to use Management Mode for your ideas. If you target Windows,
I'm afraid software MMIs/ACPI or a shim for the RT Variable Services ("execute
on variable write") are the only ways I know as you of course cannot alter the
bootloader or access the System Table at runtime.
Regards,
Marvin.
> -----Original Message-----
> From: edk2-devel [mailto:[email protected]] On Behalf Of
> [email protected]
> Sent: Tuesday, September 5, 2017 7:21 AM
> To: [email protected]
> Subject: [edk2] Accessing RT services from OS
>
> Hi All,
>
> Wanted to access RT services from OS.
> 1.) Are there any already such exposed OS function or utilities ?
> 2.) Can we plugin our own service/function to RT at run-time. ?
>
> Regards,
> Ankit Singh
>
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