Article View: comp.os.msdos.programmer
Article #547Re: Reboot from protected mode
From: bill parquet
Date: Thu, 30 Jul 1992 03:13
Date: Thu, 30 Jul 1992 03:13
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sankey@unixg.ubc.ca (Todd Sankey) writes: : Does anyone have a description or code snippet or anything to : describe how to reboot the PC from protected mode? Rebooting and kicking the computer out of protected mode are pretty similar. To reboot just do: mov al,0feh out 64h, al (It seems to be 100% effective on my 286, but it sometimes causes my 486 to crash). To get out of protected mode, there's a few outs to the CMOS before the big fe->64 to kind of give the bios a resume command. I don't know what they are off the top of my head. (BTW You might want to HLT, jump back to the halt after that... It seems like overkill, but the BIOS does it!)
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Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!malgudi.oar.net!uoft02.utoledo.edu!jupiter!billp Newsgroups: comp.os.msdos.programmer Subject: Re: Reboot from protected mode Message-ID: <1992Jul29.221323.9051@uoft02.utoledo.edu> From: billp@jupiter.cse.utoledo.edu (bill parquet) Date: 29 Jul 92 22:13:22 EST References: <sankey.711008151@unixg.ubc.ca> Nntp-Posting-Host: jupiter.cse.utoledo.edu Lines: 15