I have a small kernel which is booted with UEFI. I'm using QEMU for virtualization. I want to write a xHCI driver to support USB keyboards in my kernel. I'm having trouble to find concise and clear...

Hi I'm writing a kernel and plan to use MSI interrupt for PCI devices. However, I'm also quite confused by the documentations. My understanding about MSI are as follow: From PCI device point of ...

I am writing a boot load and try to test Inter-Processor Interrupt. I got the following 2 questions blocked me: 1, Where I can find the procedure of starting up APs; 2, When issuing IPI, where I ...

I'm developing now a code snippet that should enable\disable local APIC. I've seen in the Intel manual that I have to set a spurious interrupt vector prior to enabling LoAPIC. In the Intel Manual I...

I recently had to work around a proprietary OS issue with the x86 PIC where the OS expected timer interrupts ONLY on CPU0. I enabled the IO-APIC to get around this and did CPU steering so the inter...

Now I encounter a problem about Linux NMI Watchdog. I want to use Linux NMI watchdog to detect and recovery OS hang. So, I add "nmi_watchdog=1" into grub.cfg. And then check the /proc/int...

I should first share all what I know - and that is complete chaos. There are several different questions on the topic, so please don't get irritated :). 1) To find an ISR, CPU is provided with a i...