win10: Interrupt number is minus?

[Zheng Bao]

Maybe it is not a 100% suitable quesion. I assume big boys in coreboot know this.
[cid:1fe4e7e2-ae0a-4631-8340-d284b41a2f9d]

When I check the interrupt of network device in Windows 10, it says the IRQ is  0xFFFFFFDC(-36).
I am confused about this minus. What does it mean? Is it MSI?

Thanks.

Zheng