Hello,

On Thu, 1 Nov 2001, kirti wrote:
> Normaly we come across 2 modes of operation , user mode & kernel mode,
> Is there any OS which provides only one mode of operation ??? I think
> DOS doesn't support kernel mode as a seperate mode of operation, does
> any OS for Embeded has such fearures ??  If anybody knows it then let
> me know it.

Having user mode and kernel mode is not a bad thing in general, why do you
want to avoid it? Speaking for Linux, you should always try to design your
system in a way that you have most of your application code in user space.
The operating system helps you to protect the machine against bugs in your
application - why don't you want to use this feature?

Nevertheless, you are free to write your application as a kernel module.
Realtime programs do that on Linux, but they have several restrictions
about what they can use of the system's infrastructure (e.g. libc
routines).

Robert
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