On Fri, Mar 01, 2002 at 01:28:22PM +0530, Ketan Mukadam wrote: > > On Fri, 1 Mar 2002, Thomas Abraham wrote: > > ==>Hi Ketan, > ==> This is in response to your query on real mode. > ==> > ==>Intel processors can work in two modes. Real mode and > ==>Protected mode. In real mode, processor works with 16 > ==>bits. All the memory managment and process mangament > ==>features are turned off in this mode. But in protected > ==>mode these features are turned on which is very > ==>essentail for an operating system. Actually 3 modes, real, pmode and vm86 mode which is a real mode emulation with all the security of pmode. This is how stuff like dosemu works. > Actually what you have written, that stuff i already know, but what i wanted to > know is that where the real-mode is used except bootstrapping. Once ur OS gets > booted the processor is switched in protected mode.[ This is true of Linux ] Now > in which situations it returns to real-mode or is it that it never goes into > real-mode after booting?? Never goes into real-mode, only into vm86 mode -- Mark Zealey (aka JALH on irc.openprojects.net: #zealos and many more) mark@zealos.org; mark@itsolve.co.uk UL++++>$ G!>(GCM/GCS/GS/GM) dpu? s:-@ a16! C++++>$ P++++>+++++$ L+++>+++++$ !E---? W+++>$ !w--- r++ !t---?@ !X---? !R- !tv b+ G+++ e>+++++ !h++* r!-- y-- -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
