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A driver of a physical device that receives interrupts registers one or more interrupt service routines (ISR) to service the interrupts. The system calls the ISR each time it receives that interrupt.
PCI devices can generate message-signaled interrupts. A device generates a message-signaled interrupt by writing a data value to a particular address. Windows supports both line-based and message-signaled interrupts.
The system supports two different types of ISRs:
The driver can register an InterruptService routine to handle line-based or message-signaled interrupts. The system passes a driver-supplied context value.
The driver can register an InterruptMessageService routine to handle message-signaled interrupts. The system passes both a driver-supplied context value and the message ID of the interrupt message.
For more information about registering an InterruptService or InterruptMessageService routine to service the device's interrupts, see Introduction to Message-Signaled Interrupts.