Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/hq/sts/linux/doc/io-portprog/IO-Port-Programming-3.html
Дата изменения: Unknown
Дата индексирования: Sat Sep 11 20:33:31 2010
Кодировка:
Поисковые слова: m 2
Linux I/O port programming mini-HOWTO: Interrupts (IRQs) and DMA access Next Previous Contents

3. Interrupts (IRQs) and DMA access

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");.

Next Previous Contents