Specifications

Legacy BIOS References
169
5.6.2.2 IA-32 Interrupts
The table below lists the IA-32 interrupts.
Table 19 IA-32 Interrupts
INT Description
20-67 Unused
68 IRQ 0 – Timer interrupt
69 IRQ 1 - Unused
6A IRQ 2 - Unused
6B IRQ 3 - Unused
6C IRQ 4 - Unused
6D IRQ 5 - Unused
6E IRQ 6 - Unused
6F IRQ 7 - Unused
70 IRQ 8 - Unused
71 IRQ 9 - Unused
72 IRQ 10 - Unused
73 IRQ 11 - Unused
74 IRQ 12 - Unused
75 IRQ 13 - Unused
76 IRQ 14 - Unused
77 IRQ 15 - Unused
78-FF Unused
Intel
®
Itanium
®
Processor Family
The Itanium
®
processor family has two generic types of interrupts:
• PAL-based interrupts
• Interruption Vector Table (IVA)–based interrupts
PAL-based interrupts are handled by the PAL firmware, system firmware, or possibly the
OS. IVA-based interrupts are handled by the system firmware and operating system.
The following topics discuss these interrupts in more detail.