Well, but because those two are assigned to the terminate address of process0, you must initialize them. Regardless from where you start the Load-Process0 function.
Done now, but obviously your warning below is right.
Um, BTW: process0 must also have a nice ParentPSP, because return_user() takes the SS/SP from there and happily pokes the termination address there. (Well, I did reported this as security hazard years back, e.g. debuggers and TSR might do PSP switching and, hence, destroy there own SS/SP fields - but I never read that you have to preserve these fields).
Indeed, when I checked SS:SP of DOS_PSP (the parent of Process 0), it turned out that it points to the INIT segment! So here's why CS:IP don't restore correctly! But to what value I must initialise SS:SP of DOS_PSP, when I aim Process 0 to go to newShell() in HMA_TEXT on termination with Fn 4C?
Also, You have to deal with a reset INT-24, hence, restoring it to the internal autofail routine is a good idea; same as INT-23.
OK, but let's postpone these after Int 22 starts working (i.e. after we solve the stack problem).
Last not least, I'm now happy to see that you're a kernel expert too (besides Bart and Tom ;-)
Thanks, Lucho
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