From: Gilles Pokam <pokam@cs.tu-berlin.de>
To: linux-mm@kvack.org
Subject: question on remap_page_range()
Date: Sat, 28 Aug 1999 12:03:41 +0200 (MET DST) [thread overview]
Message-ID: <199908281003.MAA29351@zange.cs.tu-berlin.de> (raw)
Hi everyone,
I have some questions about the behavior of the remap_page_range function as
well as the ioremap.
1. remap_page_range (as well as ioremap or vremap) takes a "physical address"
as argument. In Rubini's book it is said that the so-called "physical
address" is in reality a virtual address offset by PAGE_OFFSET from the
real physical address:
phys = real_phys + PAGE_OFFSET
In x86 2.0.x kernel i had no problems with this convertion because the
PAGE_OFFSET is almost defined to be 0, so that phys = virt address.
2. But now i have tried to run my code on a x86 2.2.x kernel and the
remap_page_range function fails! When i ignore the PAGE_OFFSET macro
it works strangely ...!
My question is, what is the definition of the physical address in the
remap_page_range and vremap functions ?
Regards
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next reply other threads:[~1999-08-28 10:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-08-28 10:03 Gilles Pokam [this message]
1999-08-29 15:18 ` Stephen C. Tweedie
1999-08-31 8:23 ` Gilles Pokam
1999-08-31 10:58 ` Stephen C. Tweedie
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