> All,
>
> I'm working on the emulator for OSF1/Mach for FreeBSD/Alpha, and I need
> some help understanding how to do some things in the FreeBSD kernel--if anyone
> can answer any of the following questions, it would be greatly appreciated:
>
> 1) How do you create a process in the kernel (i.e., you fork in
> user-space...what's the analogue for kernel-space)?
>
fork1(), see kern_fork.c
> 2) How do you clone a process in kernel-space (i.e., in user-space, you would
> fork and then share the entire process's memory space--how would you do such a
> thing in kernel-space)?
>
fork1() with RFMEM flag.
> 3) What needs to be done to perform a context switch (from within the kernel),
> and are there any MP considerations when doing this?
>
Do the following,
s = splhigh();
setrunqueue(p);
p->p_stats->p_ru.ru_nivcsw++;
mi_switch();
splx(s);
nothing special for MP yet, but that's going to change soon...
> 4) In what files do the proc and the u-area structures reside?
>
If you mean header files, they are <sys/proc.h> and <sys/user.h>.
> Thanks,
> Andrew Miklic
>
-lq
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