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IRQ, the F and I bits of the CPSR program State register must be cleared first, and the corresponding bits in the interrupt shield register intmsk must also be cleared.
(2) intselect ).
The Cortex-A8 provides two interrupt modes: FIQ mode and IRQ mode. All interrupt sources must determine which interrupt mode to use when interrupting requests.
3. s5pc100 interrupt source Overview
In this chip, there are three VIC units, among which vic0 covers the interrupt source of the system, DMA, and timer.
KSOFTIRQD kernel thread execution.2) The interrupt nesting is to let the high priority interrupt get the timely response; the interrupt upper and lower half mechanism is for the low priority interrupt to get a timely response; Ksoftirqd kernel thread scheduling is the opportunity for high-priority task processes to be executed.Third, interrupt management mechanismThe following analysis is based on the Linux2.6 core and arm (S5PV210) system, in which the hardware programming of the arm (S5PV210)
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