Date: Sat, 30 Oct 1999 08:11:12 +1000 From: Patryk Zadarnowski <patrykz@mycenae.ilion.eu.org> To: Dan Nelson <dnelson@emsphone.com> Cc: Lars Gerhard Kuehl <kuehl@lgk.de>, Mike Smith <mike@smith.net.au>, hackers@FreeBSD.ORG, Chuck Youse <cyouse@paradox.nexuslabs.com> Subject: Re: Limitations in FreeBSD Message-ID: <199910292211.IAA27730@mycenae.ilion.eu.org> In-Reply-To: Your message of "Fri, 29 Oct 1999 09:56:29 EST." <19991029095629.D48778@dan.emsphone.com>
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> In the last episode (Oct 29), Lars Gerhard Kuehl said: > > > Think about it for a second. How big is a pointer? > > > > The Intel architecture still supports segmented memory, > > so the effective maximum pointer size is 48 bit. The extra 16 bits of the segment don't actually contribute to the address space size on IA32, as Intel decided to do segment translation before virtual address translation (ie, all segments have to fit in the same 32bit vaddr space). PPC, on the other hand.... ;) If you want a trully gigantic address space, try a 64 bit PPC, it's got 80 bit addresses, even if they're totally and utterly useless unless you're writing a SASOS. Pat. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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