[En-Nut-Discussion] arm port (RFC: Changing ARM mode)

[Ole Reinhardt]

Hi!

> The user mode may indeed cause problems, because our simple OS doesn't
> provide something like 'enter kernel routine'. Thus, my suggestion is to
> run the application and system routines in system mode, which is the
> privileged mode that uses the user mode register bank.

In which cases would we need 'enter kernel routine'? In some interrupt
driven functions? All other driver code shold just run fine in user
mode, does it?

For me it sounds much cleaner to run as most code as possible in user
mode and implement such context switch functions???

Bye,

Ole

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