> how (much) differs ppc's paging system from x86's one? > isn't ppc based on a 2/3 level paging architecture too?
No way. The ppc paging system according to Linus: "In particular, while I'm not a big fan of the PPC hash tables (understatement of the year), I _do_ like the BAT mapping that PPC has." "The others are just stupid aberrations (ie the ppc hash-tables), and can portably be considered nothing but in-memory TLB's." "The sane PPC setups actually have a regular soft-filled TLB, and last I saw that actually performed _better_ than the stupid architected hash- chains. And for the broken OS's (ie AIX) that wants the hash-chains, you can always make the soft-fill TLB do the stupid thing.."
