Messages in this thread | | | Date | Tue, 14 Apr 2015 19:16:08 +0600 | Subject | x86_64: Question about fixmaps | From | Alexander Kuleshov <> |
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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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