Re: return to real mode

1999-10-01 Thread Mike Smith 

 anybody got some reliable, tested, known-good code for getting back to
 real mode? I'm to the point where I have a working GDT, and paging is
 turned off, but the last step -- turning off protection enable -- is not
 working for me. 

You want to be more explicit about why you want to get back?  There are 
possibly alternatives, or other collateral damage issues that might be 
worth commenting on.

-- 
\\ Give a man a fish, and you feed him for a day. \\  Mike Smith
\\ Tell him he should learn how to fish himself,  \\  [EMAIL PROTECTED]
\\ and he'll hate you for a lifetime. \\  [EMAIL PROTECTED]




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Re: return to real mode

1999-10-01 Thread Sergey Babkin 

Mike Smith wrote:
 
  anybody got some reliable, tested, known-good code for getting back to
  real mode? I'm to the point where I have a working GDT, and paging is
  turned off, but the last step -- turning off protection enable -- is not
  working for me.
 
 You want to be more explicit about why you want to get back?  There are
 possibly alternatives, or other collateral damage issues that might be
 worth commenting on.

I have an almost-working code written yet in the 2.0.5 days. Then there
was a guy Wee Teck [EMAIL PROTECTED] who asked a similar question
and I sent my code to him. He has found the final bug and got it working.
Maybe he is still on the list and can provide some information. I'm
going to send my code and his fix off the list.

-SB


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Re: return to real mode

1999-09-30 Thread Julian Elischer 


the old boot code did it for  calling the bios did it not?

julian


On Wed, 29 Sep 1999, Ronald G. Minnich wrote:

 anybody got some reliable, tested, known-good code for getting back to
 real mode? I'm to the point where I have a working GDT, and paging is
 turned off, but the last step -- turning off protection enable -- is not
 working for me. 
 
 This is on a PII.
 
 Thanks
 
 ron
 
 
 
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Re: return to real mode

1999-09-30 Thread Ronald G. Minnich 

well, I'll go check that. I'm finding that there is fair amounts of code
out there that is broken. Thanks to the wonderful PC bios you have a hard
time sometimes telling the difference between code that crashes into the
bios and code that actually works right, since the result is the same
either way :-)

rn




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RE: return to real mode

1999-09-29 Thread John Baldwin 


On 29-Sep-99 John Baldwin wrote:
 GROUP CodeGroup _TEXT32, _TEXT16
 
 ASSUMECS:CodeGroup, DS:_PMDATA
 
 
 
 SEGMENT   _TEXT32 Byte  Public Use32 'CODE'
 
 
 
   db  0EAh
   dd  OFFSET ExitPM
   dw  Sel_CS16

Here's the missing comment for the above:   ; jmp   far ExitPM

 This code has been tested (and works) on 386, 386, and Pentium. 
 Presumably it should work on later chips as well.

Should read: "386, 486, and Pentium..."
   ^^^
---

John Baldwin [EMAIL PROTECTED] -- http://www.cslab.vt.edu/~jobaldwi/
PGP Key: http://www.cslab.vt.edu/~jobaldwi/pgpkey.asc
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/


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