linux-kernel - The 3G (or nG) Kernel Memory Space Offset

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Message-ID: <a2ebde260608290715o627c631uca67e5b84b8c0777@mail.gmail.com>
Date:	Tue, 29 Aug 2006 22:15:19 +0800
From:	"Dong Feng" <middle.fengdong@...il.com>
To:	"Andi Kleen" <ak@...e.de>, "Nick Piggin" <nickpiggin@...oo.com.au>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Dong Feng" <middle.fengdong@...il.com>,
	"Paul Mackerras" <paulus@...ba.org>,
	"Christoph Lameter" <clameter@....com>,
	"David Howells" <dhowells@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: The 3G (or nG) Kernel Memory Space Offset

The Linux kernel permenantly map 3-4G linear memory space to 0-4G
physical memory space. My question is that what is the rationality
behind this counterintuitive mapping. Is this just some personal
choice for the earlier kernel developers?
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