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3. Interrupts (IRQs) and DMA accessYou cannot use IRQs or DMA directly from a user-mode process. You need to write a kernel driver; see The Linux Kernel Hacker's Guide for details and the kernel source code for examples. You can disable interrupts from within a user-mode program, though it can
be dangerous (even kernel drivers do it for as short a time as possible).
After calling
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