Subj : Interrupts
To : Jonathan De Boyne Pollar
From : Lee Aroner
Date : Tue May 29 2001 02:45 am
LA> I had simply assumed that OS/2 used the same invalid int trick to
LA> switch rings as Win does.
JdBP> The interrupt(s) used on DOS-Windows and and Windows NT
> aren't "invalid". They are perfectly valid. Their entries
> in the IDT point directly to the syscall dispatch routines.
<sigh> OK, poor choice of language. The int is fine.
What is done to switch control from the application to the OS is
a jump into the bios copyright notice to force a processor
exception.
