🚀 go-pugleaf

Hi,

Has anyone managed to use IOPL to access hardware ports? I'm having trouble 
with it. I get an access violation (SYS3175) whenever the code tries to call 
a subroutine in the IOPL'd (ring 2) segment.

I'm currently using a 16 bit compiler (Microsoft 6.00A) and assembler 
(Microsoft 5.1). There are 6 assembler subroutines that do the actual 
i/o and the rest of the code is written in C. I have a .DEF file to define the
assembler routines segment as IOPL and list the exported subroutines. In fact,
it follows the examples in both Duncan's "Advanced OS/2 Programming" and 
Steven Mastrianni's "Writing OS2 2.0 Device Drivers in C".

If anyone has any suggestions, ideas, or information please mail me 
jan@dukehrl.mc.duke.edu. 

Thank you very much,
Jan Gittelman

PS. If this can be done in 32 bits (C SET/2) I'd like to know that too, since
I'm not having any luck with that either. Thanks.