>>You can't use conventional 32-bit x86 code, so there seems little or no >>benefit in allowing 32 and 64-bit code to be mixed. > >Why not? Switching between 32- and 64-bit modes doesn't involve anything >(apart from knowing the proper selector register values) that cannot be done >purely in user mode. Specifically, I once successfully tried executing 64-bit >code in a 32-bit process.
Oh, I didn't see the original post first (the spam filter ate it for some reason). Of course, if the intention of running this in 64-bit mode makes my comment void (except for the rumor-like thing I heard a few times that there's an undocumented EFER bit allowing x86-32 mode in the sense intended here, but that again would require a kernel running in the same mode underneath). Jan
