HP Kayak XU 04xx HP Kayak XU PC Workstation Technical Reference Manual Hardwar - Page 66

On the HP Kayak XU PC Workstation, this mode is, PIC mode, Virtual wire mode, Symmetric I/O mode

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4 HP BIOS BIOS Addresses There are three major interrupt modes available: 1 PIC mode: This "Legacy" mode uses only the 82C59 interrupt controllers. Therefore, only one processor can be supported in this mode. The system can be forced to operate in this mode by selecting "mono-processing" in the system setup. 2 Virtual wire mode: On the HP Kayak XU PC Workstation, this mode is implemented using the 82C59 interrupt and the I/O APIC controller 82093AA. This mode is used during boot time, if the choice "multiprocessing" has been selected in the system setup. The virtual wire mode allows the transition to the "symmetric I/O mode". In the virtual wire mode, only one processor operates. 3 Symmetric I/O mode: This mode is implemented using the I/O APIC controller 82093AA and allows the operating system for Symmetric MultiProcessing (SMP) operation (refer also to above, item 2). For further information about Multi-Processing, see "Configuring Setup for MultiProcessing" on page 18. NOTE In "PIC mode" and "virtual wire mode", the PCI interrupts are routed inside the 82C59 to ISA interrupts. In the "symmetric I/O mode", the PCI and ISA interrupts are used by the 82093AA and are handled in a separate manner. 58

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58
4
HP BIOS
BIOS Addresses
There are three major interrupt modes available:
1
PIC mode:
This “Legacy” mode uses only the 82C59 interrupt controllers.
Therefore, only one processor can be supported in this mode. The system
can be forced to operate in this mode by selecting “mono-processing” in
the system setup.
2
Virtual wire mode:
On the HP Kayak XU PC Workstation, this mode is
implemented using the 82C59 interrupt and the I/O APIC controller
82093AA. This mode is used during boot time, if the choice “multi-
processing” has been selected in the system setup. The virtual wire mode
allows the transition to the “symmetric I/O mode”. In the virtual wire
mode, only one processor operates.
3
Symmetric I/O mode:
This mode is implemented using the I/O APIC
controller 82093AA and allows the operating system for Symmetric Multi-
Processing (SMP) operation (refer also to above, item 2). For further
information about Multi-Processing,
see “Configuring Setup for Multi-
Processing” on page
18
.
NOTE
In “PIC mode” and “virtual wire mode”, the PCI interrupts are routed inside
the 82C59 to ISA interrupts. In the “symmetric I/O mode”, the PCI and ISA
interrupts are used by the 82093AA and are handled in a separate manner.