Extended Message Signaled Interrupts (MSI-X) are an enhanced version of MSI interrupts. With MSI-X support, device driver writers have a choice between MSI and MSI-X interrupts. MSI-X interrupts are now supported on SPARC PCI-Express platforms (Ultra 45 and Sun Fire T2000). The Sun Fire T2000 might also include the Sun Fire T1000 machine.
A new mdb/kmdb debugger command, ::interrupts, is also provided to retrieve a device's registered interrupt information on supported SPARC and x86 systems.
For more information, see “Interrupt Handlers” in Writing Device Drivers.