> Well, buffer_init() where vmalloc() is called for the first time is
> a first check of your R3000 specific mm stuff, especially the TLB
> exception handler.
> With 99.9% probability your problem is in the TLB exception handler.
Yep, I've managed to narrow it down to that...
> Try some code like the following:
> x = vmalloc(PAGE_SIZE);
> *(unsigned int *)x = 42;
This is exactly the sort of code in vmalloc that is failing.
> and add code to the TLB exception handler (at KSEG0) to print out the
> content of the TLB's entries.
> What non-wired TLB entries do you have? Are they correct?
Ummm... there are no wired entries. I've no idea what non-wired
entries I have, nor whether they are correct.
> .37 does no longer use the old scheme were a processes' page tables
> were also mapped at the address TLBMAP (0xe4000000), so you will
> have to rewrite the TLB exception handlers for the R3000.
> The good news is the current stuff makes a *lot* less of headache,
> specially on CPUs with virtual indexed caches like the R4k.
...so the code for the R3K will be very different I assume.
> Debugging these handlers is nasty and can easily lead you to
> undocumented MIPS ...
It is an almighty pain, but in other ways quite satisfying when it
Paul M. Antoine, Net: firstname.lastname@example.org
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