On Wed, 8 Jan 2003, Ralf Baechle wrote: > We used to use just KSEG0 instead of KSEG0+entry*0x2000. That was running > fine over years but had to be changed for the sake of two CPUs afair. There > was some discussion on this list about this and I accepted the change by that > time because Kevin imho correctly argued that the spec left it unspecified > if an implementation is feeding addresses in an unmapped address space > though the TLB. Well, like it or not, CAMs do not like multiple matches -- up to a physical damage even. So they should be avoided if possible. While KSEG0 won't match for any real address translation, there is a non-zero probability of executing a tlbp for it as a result of buggy code or execution gone wild (root running crashme?). -- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
