During an x86 software interrupt, when exactly is a context switch made?

Question

I am asking this because I am trying to implement interrupts in my toy kernel. So, I know that when an interrupt occurs, the CPU pushes various bits of information onto the stac

Answer 1

Just take the Intel Manual 3 and read:

• Chapter 6 INTERRUPT AND EXCEPTION HANDLING
• Section 5.8.5 Stack Switching
• 5.8.6 Returning from a Called Procedure.

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This is what is pushed on an interrupt

Keep in in mind that interrupt are handled with Task Gates, Trap gates and Interrupt gates, each one with different semantic and the last two very close to Call gates.