Date: Sat, 12 Mar 2005 18:12:19 +0000 From: Alex Burke <alexjeffburke@gmail.com> To: FreeBSD-HACKERS <freebsd-hackers@freebsd.org> Subject: Low level hardware access in FreeBSD Message-ID: <a8b8bb5105031210121791a9d5@mail.gmail.com>
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Hi, I am just wondering how I can access either BIOS calls, or preferably registers under FreeBSD? I am trying to write a simple system capable of displaying graphics on the screen, and I am pretty sure I can mmap the VGA memory to my programs address space. However, to be able to output graphics onto the screen I think I need to change the state of the VGA registers from text mode (I am guessing thats what the console driver uses) to graphical mode (of which i know there exist a couple) - but I think that involves programming registers and I dont know how to do that under FreeBSD. Also, for the FreeBSD console driver to pick the console back up once it finished working, would I be required to reset the VGA registers back to text mode? Thanks, Alex J Burke.
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