Where system interrupts get disabled at LAPIC timer handler execution?
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From: limp on 16 Jul 2010 05:40 Dear all, I am trying to demystify what happens when the kernel has configured to use LAPIC timer as its timer and I've ran into some problems/questions. AFAIK, when a LAPIC timer interrupt occurs, the assembly wrapper at enrty_32.s jumps the execution at smp_apic_timer_interrupt(). At the beginning of this function, I've checked to see if interrupts are enabled or not using irqs_disabled() and I found out that they are disabled. The problem is that I can't find where Linux disables interrupts before calling smp_apic_timer_interrupt(). The only place this could be done is in the assembly wrapper but I can't really find it. Does the processor disables interrupts by default when a LAPIC timer interrupt occurs? Any help will be much appreciated. Thanks in advance. John. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |