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Altera_Forum
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14 years ago

I/o irq

Hello my system has two CPUs- CPU1 w/ linux and cpu2 w/o linux. I want to handle an IRQ inside CPU1 Linux generated by CPU2 when it writes to a PIO . [cpu1]---[cpu2]
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Linux device drivers book says you must not read/write from I/O nor change information between userspace/kernel space inside an IRQ.

I have a char device driver and i want to call my Read function when an ISR happens.. how can i do that? I can't do a while loop when i call read from userspace since i don't know when the data is ready therefore i can't just call it from anywhere