Interrupts and Interrupts Handling

1
Interrupts and Interrupts Handling
2
Interrupt Routing
3
Initializing the Interrupt Handling Data
Structures

• The kernel's interrupt handling data structures
  are set up by the device drivers as they request
  control of the system's interrupts
• The individual device drivers call Linux system
  services routines to register their interrupt
  handling routine addresses

4
Interrupt Number

• Some devices are fixed
• e. g. floppy IRQ 6
• PCI devices no problem
• PCI BIOS, PCI initialization
• ISA Linux allows device drivers to probe for
  their interrupts

5
Interrupt Handling
6
Linux Interrupt Handling

• Linux read the interrupt status register of PIC
  to determine the source
• Translate the source into offset int irq_action
  vector
• Linux call into the interrupt handling routines
  for all of the irqaction data structures