linux-kernel - x86_64: Question about fixmaps

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Message-ID: <CAFkLPWHg-AO2x-kFfHaw7ZP=w_Lq+pUST3a0Nm9o0G3eQWUk=w@mail.gmail.com>
Date:	Tue, 14 Apr 2015 19:16:08 +0600
From:	Alexander Kuleshov <alex0xax@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: x86_64: Question about fixmaps

Hello All,

I'm reading x86_64 source code and trying to understand where are
fixmaps space in the virtual memory space. If I understand correctly
(but i'm really not sure about it), fixmap space is after vsyscall
space. As Documentation/x86/x86_64/mm.txt says vsyscall virtual space
is:

ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls

With 'earlyprintk' i got FIXADDR_START and FIXADDR_TOP and they are:

FIXADDR_START -  0xffffffffff779000L
FIXADDR_TOP     -  0xffffffffff7ff000L

with these addressess FIXADDR_START/FIXADDR_TOP overlap vsyscalls
area. Is it correct case that fixmaps are in vsyscal virtual memory
space or I'm wrong somewhere?

Thank you.
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