On Thu, Jun 14, 2012 at 02:14:45PM +0000, Bret Johnson wrote: > > Specifically, I am trying to determine if there are legacy > > applications or operating systems that invoke standard BIOS > > real-mode interrupt handlers while in 16bit protected mode. (The > > legacy real-mode entry points - like "int 0x13" - not the > > declared 16bit protected mode entry points defined by the PnP and > > APM specs.) > > I am currently i process of updating my USB TSR drivers so that they > can run int 16-bit protected mode, with the aid of the > Novell-provided DPMS server. When I need to issue a BIOS INT call > of some sort from inside the TSR, however, I currently do not do it > with an "INT xx" OpCode. Instead, I look up the vector address in > the IVT and issue a DPMS "Call Real Mode Procedure with IRET" > function.
That shouldn't be an issue. The DPMS system should translate any request in 16bit protected mode to a real-mode request (even if INT xx is used). So, the underlying BIOS doesn't have to worry about being invoked in 16bit protected mode in this case. Thanks, -Kevin ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Freedos-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freedos-devel
