<sourceforge is running at least 10 hours behind, so CC'ed directly> At 03:23 AM 7/27/2006 +0200, Eric Auer wrote:
>Eric indicated I need to allow local A20 control, but >as it turns out, that won't help. EXEPACK code simply doesn't call >A20 >routines, so EMM386 cannot fix this problem. It never "sees" the >wrap >occurring. The situation has to be corrected within the >kernel. >--- > >The kernel DOES correct the problem. And things do work with HIMEM. >The PROBLEM is that EMM386 does not allow programs to disable the A20. > >This also means that EMM386 does not allow the kernel to disable the A20 >either, of course... You win. I added support for local and global disable/enable of A20 functions by changing the mappings of the 16 HMA page table entries to point to 0:0 on disable and 100000h on enable. With that in place, the EXEPACK'd program did work correctly without a LOADFIX approach. Whether EMM386's support for disable A20 will unlease many kinds of mischief -- as warned about in the original source code comments, and listed as the reason support was not provided originally -- remains to be seen. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
