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CONFIG_UIO_PDRV_GENIRQ: Userspace I/O platform driver with generic IRQ handling

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The Linux kernel configuration item CONFIG_UIO_PDRV_GENIRQ:

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Platform driver for Userspace I/O devices, including generic interrupt handling code. Shared interrupts are not supported.

This kernel driver requires that the matching userspace driver handles interrupts in a special way. Userspace is responsible for acknowledging the hardware device if needed, and re-enabling interrupts in the interrupt controller using the write() syscall.

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