Re: A few patches for 2.4.x for Alpha...
On Wed, Aug 08, 2001 at 12:05:25PM +0100, Nikita Schmidt wrote:
> I always thought that the self-mapping entry was used by PALcode to
> quickly handle TLB misses. When the appropriate entries of page table
> self-mapping are not cached in DTBs, PALcode has to descend through page
> tables. I don't remember what happens if the self-mapping is not provided
> at all - if things are still working, it means that PALcode has to go the
> "slow" way for every TLB miss.
Yes, I guessed it was used by the palcode for the tlb handling (this is
why I didn't dropped those lines yet). I had a look and it's not clear
why 2.2 segfaults and 2.4 doesn't, actually they seem to initialize the
last entry of the pgd the same way...