[lkml]   [2004]   [Aug]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: x86 - Realmode BIOS and Code calling module
On Thu, Aug 12, 2004 at 03:38:45PM +0200, Jakub Vana wrote:

> > Why is this better than LRMI in user mode.
> I was now looking on LRMI. It must be a nice code, but It is still
> only V86 emulation. I have listen that some BIOSes use something
> called Unreal mode, that is realmode with segment registers used like
> in protected mode. There is only one way, how to set this segregs -
> switch to prot. mode, but if the BIOS try to switch when is running in
> V86 CPU generates #GP (Global Protection fault). Not if it is running
> in real Real Mode.

Well, if it's running an emulated CPU (x86emu), there are no problems
with that. Even the unreal mode could be emulated, although I have yet
to see a BIOS which uses that to handle an INT call.

Vojtech Pavlik
SuSE Labs, SuSE CR
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:05    [W:0.024 / U:7.336 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site