add edk2 mm request serialization protocol

[Gerd Hoffmann via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Gerd Hoffmann <kraxel () redhat com>
>
> Date: Thu, 8 May 2025 13:09:05 +0200
>
>   Hi,
>
> I'd like to add a new linktype: EDK2_MM
>
> This is the request serialization protocol used by edk2 firmware to
> communicate between normal mode and management mode ('MM' for short).
>
> Qemu recently (version 10.0 released last month) got a uefi variable
> store implementation, and that reuses the request serialization protocol
> for firmware <-> qemu communication.
>
> I have a patch for writing out a pcap trace of the firmware <-> qemu
> communication, and I think it makes sense to get an official linktype
> number assigned before sending out that patch for merge into qemu, so
> here I am ;)
>
> PRs:
>  - https://github.com/the-tcpdump-group/libpcap/pull/1514
>  - https://github.com/the-tcpdump-group/tcpdump-htdocs/pull/42
>
> qemu patch:
>  - https://git.kraxel.org/cgit/qemu/commit/?h=sirius/uefi-vars-pcap&id=7a5f3dd3a8eaeaad052111266470db131c061959
>
> rust parser:
>  - https://gitlab.com/kraxel/virt-firmware-rs/-/blob/main/varstore/src/pcap/parse.rs
>
> take care,
>   Gerd
>
>
> --- End Message ---
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