Date: Fri, 3 Aug 2001 12:41:53 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Mike Smith <msmith@freebsd.org> Cc: Kenneth Wayne Culver <culverk@wam.umd.edu>, John Baldwin <jhb@FreeBSD.ORG>, freebsd-hackers@FreeBSD.ORG, craig <craiglei@pasia.com.cn>, Terry Lambert <tlambert2@mindspring.com>, Rik van Riel <riel@conectiva.com.br> Subject: Re: How to visit physical memory above 4G? Message-ID: <Pine.BSF.4.21.0108031238070.51833-100000@InterJet.elischer.org> In-Reply-To: <200108030352.f733q9C01482@mass.dis.org>
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On Thu, 2 Aug 2001, Mike Smith wrote: > Julian is on crack. DAC (Double Address Cycle) is a relatively recent > addition to PCI that allows 32-bit cards with 64-bit savvy logic to talk > to host memory using 64-bit target addresses. well "day 1" was an exageration, but my 1995 PCI stuff already includes it. Crack? no.. optimism, maybe.. > Older systems used a scatter-gather mechanism to present a virtualised > view of the system's physical address space to the PCI bus (typically > you'll see this in Alpha systems). To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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