Eric W. Biederman wrote: > Ok. If you have tested on a wide variety of machines then I won't > worry about it. > > I guess if a cr0 write has always been synchronizing things should be > a safe practice. The practical danger is if you write to cr0 and the > pipeline is not flushed and the segment loads might execute as 16bit > mode segment register loads. I think this is more of a 486 or 586/Pentium > danger actually then a 386 one.
Writes to CR0 are synchronizing and are documented as such. This is a fairly trivial consequence of it invoking microcode on every x86 ever created. > Hmm. I'm not certain about enabling protected mode but enabling paging > at least does appear to be documented to require a jump, before the P6 > core. Which may be why it is recommended for initializing protected > mode. Enabling paging is possibly a different matter. I can't speak on that particular subject with any authority. -hpa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/