Date: Mon, 03 Apr 2006 17:23:13 -0400 From: Mike Jakubik <mikej@rogers.com> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: freebsd-amd64@freebsd.org Subject: Re: Status of NX bit support. Message-ID: <44319241.7080208@rogers.com> In-Reply-To: <20060403211943.GA99241@troutmask.apl.washington.edu> References: <44301C6D.3010206@rogers.com> <200604031442.43477.jhb@freebsd.org> <44318E3F.6080808@rogers.com> <20060403211943.GA99241@troutmask.apl.washington.edu>
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Steve Kargl wrote: > On Mon, Apr 03, 2006 at 05:06:07PM -0400, Mike Jakubik wrote: > >> John Baldwin wrote: >> >>> On Sunday 02 April 2006 14:48, Mike Jakubik wrote: >>> >>> >>>> I was wondering what the status of the NX bit support is. Is the pmap.c >>>> code still broken or is support enabled and functioning by default? >>>> >>>> >>> I don't think the status has changed. >>> >>> >>> >> Well that sucks.. I guess then there really is no reason for someone to >> run in amd64 mode unless you need more than 4GB of ram. >> >> > > You're joking, right? How many registers are available for the > i386? How many registers are available to an AMD64 cpu in > 64-bit mode? > > Yes, but doesn't the software have to be written to take advantage of these? (What about Intels 64bit extensions, do they have the same extra registers as the amd cpus?). As far as i can see so far, amd64 mode just eats more memory.
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