🚀 go-pugleaf

Can someone give me a few pointers on how to handle hardware
interrupts on the PC?  I have written a C library to do interrupt
driven communications.  [I know all about FOSSILs, but I need the
program to be stand alone.]  I have no problem attaching isr's to the
standrad irq's [IRQ 3 & 4], but I am now trying to support any irq
(0-15).  I do not know exactly how to proceed with the slave PIC.
Especially when it comes to IRQ9 which is documented as being
redirected to IRQ2.

My "feeling" at this point is
   when attaching IRQ9, write an ISR and put it in IRQ2's vector
      when doing the pic EOI, send it to the master and the slave
   when handling IRQ8,10,11,12,13,14,15, put the ISR
      at the appropriate INT vector (0x70, 0x72 through 0x77) and
      send the EOI to the master and the slave
   when handling the "normal" interrupts, use my existing code, which
      attached the appropraite int vector (0x08..0x0F) and send the
      EOI only to the master pic.

If anyone knows that I am doing something wrong, please let me know.
Similarly, if there is a good reference that discusses programming the
AT interrupts, I'd also be interested in hearing from you.


Thanks.  
--
Stephen Corbesero
CSEE Dept, Lehigh University