gdisk | GUID disk partition editor
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QUESTION
I'm coding a small OS kernel which is supposed to have a driver for the Intel's xHC (extensible host controller). I got to a point where I can actually generate Port Status Change Events by resetting the root hub ports. I'm using QEMU for virtualization.
I ask QEMU to emulate a USB mouse and a USB keyboard which it seems to do because I actually get 2 Port Status Change Events when I reset all root hub ports. I get these events on the Event Ring of interrupter 0.
The problem is I can't find out why I'm not getting interrupts generated on these events.
I'm posting a complete reproducible example here. Bootloader.c is the UEFI app that I launch from the OVMF shell by typing fs0:bootloader.efi
. Bootloader.c is compiled with the EDK2 toolset. I work on Linux Ubuntu 20. Sorry for the long code.
The file main.cpp is a complete minimal reproducible example of my kernel. All the OS is compiled and launched with the 3 following scripts:
compile
...ANSWER
Answered 2021-Apr-26 at 06:13I finally got it working by inverting the MSI-X table structure found on osdev.org. I decided to completely reinitialize the xHC after leaving the UEFI environment as it could leave it in an unknown state. Here's the xHCI code for anyone wondering the same thing as me:
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