Hi, Roushan Ali wrote: > "How the check for authirized source of an interrupt is done in > linux ? If it is done by comparing the CPL with the DPL of IDT or > GDT , then if a hardware interrupt comes while the CPU is executing a > process in user mode(CPL = 3), so how does the CPU decide whether to > handle the interrupt or not ?" The processor switches to the priviledge level needed by the interrupt handler (generally priviledge 0), and executes the interrupt handler in that priviledge level. Sincerly, Thomas -- Thomas Petazzoni thomas.petazzoni@xxxxxxxx -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
