from where ipintr is called?

[Joe Cao <caoco2002_(_at_)_yahoo_(_dot_)_com>]

Hello,
 
Can anyone help me to understand how interrupts are handled for PCI ether card?  I find ipintr() is called to handle incoming IP packets from the PCI ether card on my machine.  However, when I traced in the code, I found ipintr is called from DONETISR which is invoked in arch/i386/isa/icu.c.  
 
So my question is why functions defined in isa (supposed written for ISA cards) are used for PCI devices?
 
Thanks for the help!
Joe
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