Driver interrupt

Driver Interrupt. Example shows the interrupt handling for the printer driver. lpintr is the driver-interrupt handler registered by the attach routine. lpout takes a single character from the queue and sends it to the printer. For convenience, the message currently being output is stored in lp-msg in the per-instance structure. It is assumed that this is called with the mutex held.  · A device driver does not instruct its hardware to release the interrupt signal, because it does not detect that the interrupt was initiated from its hardware. A device driver claims the interrupt even though the interrupt was not initiated from its hardware. This situation can only occur when multiple devices are sharing the same IRQ.  · A driver who led deputies on a minute pursuit in the San Diego area interrupted a funeral service at a church where he was taken into custody at the altar. © Provided by NBC Los Angeles.

The interrupt services provided by device driver code, based upon the mechanisms discussed above, include enabling/disabling interrupts through an interrupt control register on the master CPU or the disabling of the interrupt controller, connecting the ISRs to the interrupt table, providing interrupt levels and vector numbers to peripherals, providing address and control data to corresponding registers, etc. Additional services implemented in interrupt access drivers include the locking. When registering interrupts the driver must provide the system with an interrupt number. This interrupt number identifies the interrupt specification for which the driver is registering a handler. Most devices have one interrupt: interrupt number 0. However, there are devices that have different interrupts for different events. Driver Interrupt. Example shows the interrupt handling for the printer driver. lpintr is the driver-interrupt handler registered by the attach routine. lpout takes a single character from the queue and sends it to the printer. For convenience, the message currently being output is stored in lp-msg in the per-instance structure. It is assumed that this is called with the mutex held.

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