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This question concerns the interaction of maskable interrupts and non-maskable interrupts (NMI), as discussed with particularity in Sections 6-7 through 6-9 (Pages 6-8 through 6-12) of Volume 3A of the December 2011 edition of the Software Developer's Manual.
Assume that code executing at privilege level 3 is interrupted by an interrupt or an exception other than an NMI (e.g., a page fault) and that the appropriate descriptor in the IDT invokes a handler executing at privilege level 0 with maskable interrupts disabled. (As per the first bullet point on Page 6-17, a stack switch accompanies the privilege-level change.) The question is: can an NMI interrupt this handler (and transfer execution to the NMI handler) before the execution of the first handler's first instruction?
Thanks,
Eric Grant
Assume that code executing at privilege level 3 is interrupted by an interrupt or an exception other than an NMI (e.g., a page fault) and that the appropriate descriptor in the IDT invokes a handler executing at privilege level 0 with maskable interrupts disabled. (As per the first bullet point on Page 6-17, a stack switch accompanies the privilege-level change.) The question is: can an NMI interrupt this handler (and transfer execution to the NMI handler) before the execution of the first handler's first instruction?
Thanks,
Eric Grant
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