Re: [patch] SMP alternatives

From: H. Peter Anvin
Date: Wed Nov 23 2005 - 14:12:56 EST

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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