OSDev.org

Posted: **Wed Jun 08, 2011 6:10 pm**

Hi,

I'm trying to read a ATAPI device using -ALL- of the functions that are in: http://wiki.osdev.org/IDE
I'm calling ide_atapi_read() and the problem is in the function ide_wait_irq():

Code: Select all

void ide_wait_irq() {
   while (!ide_irq_invoked)
      ;
   ide_irq_invoked = 0;
}

when this function is called by ide_atapi_read(), the while loops infinite time.
...which could be my problem? the IRQ numbers are the default in my OS and the interrupts i think that are enabled.
Maybe i need put some interrupt/irq extra definition in some part of my os?

pd: i dont have problems with ATA read, my problem is in ATAPI because it uses IRQs....
thanks-

Posted: **Thu Jun 09, 2011 2:07 am**

Did you install the interrupt handler setting ide_irq_invoked to 1?
Did you clear nIEN?
Does your interrupt handler been invoked?

Posted: **Thu Jun 09, 2011 2:50 am**

Did you tell the compiler ide_irq_invoked is volatile? Otherwise it may try to over-optimize it.

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