Vectored Interrupts

Devices that use vectored interrupts are assigned an interrupt vector. This is a number that identifies a particular interrupt handler. This vector may be fixed, configurable (using jumpers or switches), or programmable. In the case of programmable devices, an interrupt device cookie is used to program the device interrupt vector. When the interrupt handler is registered, the kernel saves the vector in a table.

When the device interrupts, the system enters the interrupt acknowledge cycle, asking the interrupting device to identify itself. The device responds with its interrupt vector. The kernel then uses this vector to find the responsible interrupt handler.

The VMEbus supports vectored interrupts.