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: http://jet.sao.ru/hq/sts/linux/doc/io-portprog/IO-Port-Programming-3.html
Дата изменения: Unknown Дата индексирования: Tue Oct 2 09:31:32 2012 Кодировка: Поисковые слова: cygnus loop |
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");.