I think generaly BIOS interrupts can be called from 16-bit protected mode in case when all interraction between BIOS and user program is done using registers. If the interraction is done via buffers, it will not work.
> ------------ Původní zpráva ------------ > Od: Bret Johnson <[email protected]> > Předmět: Re: [Freedos-devel] BIOS calls in 16bit protected mode > Datum: 14.6.2012 16:16:29 > ---------------------------------------- > > 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. > > I could theoretically issue the "INT xx" OpCode directly, but I don't do it > that > way for logistical reasons, at least in the current versions of the programs > -- > but that could change in the future. In short, I think what you're doing is > probably not a good idea. It's not just "legacy" applications you need to > worry > about, but new ones (including TSR's and Device Drivers) as well. > > I think Japheth's JLM architecture for TSR's and Device Drivers allows them to > do things from 16-bit PM as well, though the "default" is 32-bit PM. > > > ------------------------------------------------------------------------------ > 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 > > > ------------------------------------------------------------------------------ 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
