Messages in this thread | | | Date | Wed, 23 Nov 2005 11:12:01 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [patch] SMP alternatives |
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Linus Torvalds wrote: > > Of course, if it's in one of the low 12 bits of %cr3, there would have to > be a "enable this bit" in %cr4 or something. Historically, you could write > any crap in the low bits, I think. >
No, most of them are RAZ, but there are at least a couple of bits which have effect (e.g. caching of the page tables.)
However, with PAE there aren't really a whole lot of unused bits in CR3.
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