Re: [Geekos-devel] DEFS.H

[David H. <da...@cs...>]

On Tue, Apr 22, 2003 at 05:25:42AM -0700, Behrang Saeedzadeh wrote:
> Hi All
> 
> What are the ICW1 ... ICW4 used for? What they mean?

These constants are in defs.asm, and they are used for programming
the 8259A PIC chips used to route external interrupts to the CPU.

ICW means "initialization control word", IIRC.  Their meaning is
described in the 8259A datasheet.

-Dave