From: Yuhong Bao <yuhongbao_386@hotmail.com>
To: <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
<mingo@redhat.com>, <linux-kernel@vger.kernel.org>
Subject: RE: Ubuntu 32-bit, 32-bit PAE, 64-bit Kernel Benchmarks
Date: Sun, 28 Feb 2010 17:38:26 -0800 [thread overview]
Message-ID: <SNT125-W5408CB144BBE5A15619797C33C0@phx.gbl> (raw)
In-Reply-To: <4B511B12.6010208@zytor.com>
> The way the 286 could access 16MB of memory was plain old segmentation, just in a different way than EMS did.
I mean different from the way 8086/8088 did, which was that the selector's base address was always the selector value itself shifted by 4 bit to get a 20-bit base address. The 286 and later supported this in their real mode (and virtual 8086 mode in 386 and later) for compatibility. But in their protected mode, the selector was looked up in the GDT/LDT to get the base address and length of the segment as well as protection attributes.
Yuhong Bao
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http://clk.atdmt.com/GBL/go/201469226/direct/01/
next prev parent reply other threads:[~2010-03-01 1:38 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-31 1:29 Ubuntu 32-bit, 32-bit PAE, 64-bit Kernel Benchmarks Yuhong Bao
2009-12-31 2:49 ` Bill Davidsen
2009-12-31 8:21 ` Boaz Harrosh
2009-12-31 16:32 ` Bill Davidsen
2009-12-31 17:49 ` Pedro Ribeiro
2009-12-31 18:39 ` Linus Torvalds
2010-01-03 3:39 ` Yuhong Bao
2010-01-16 0:48 ` Yuhong Bao
2010-01-16 1:49 ` H. Peter Anvin
2010-01-16 2:06 ` Yuhong Bao
2010-01-16 3:47 ` Linus Torvalds
2010-01-16 4:32 ` yuhongbao_386
2010-01-16 4:53 ` H. Peter Anvin
2010-01-16 6:17 ` yuhongbao_386
2010-01-16 17:59 ` Bill Davidsen
2010-01-17 9:26 ` matthieu castet
2010-01-31 17:03 ` Robert Hancock
2010-01-16 12:33 ` Sitsofe Wheeler
2010-01-16 12:57 ` Robert P. J. Day
2010-01-16 17:11 ` H. Peter Anvin
2010-03-01 1:31 ` Yuhong Bao
2010-03-01 1:38 ` Yuhong Bao [this message]
2010-01-16 8:46 ` Geert Uytterhoeven
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