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You 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 iopl(3) , you can disable interrupts simply by calling
asm("cli"); , and re-enable them with asm("sti"); .
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