minios: don't rely on specific page table allocation scheme
Today mini-os is making assumptions how the page tables it is started
with are being allocated. Especially it is using the number of page
table frames to calculate which is the first unmapped pfn.
Instead of relying on page table number assumptions just look into the
page tables to find the first pfn not already mapped.
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
master commit: 8d84345a20d8a46ea26379c9f19961f6aa3e6e83
master date: Fri Nov 20 19:32:42 2015 +0100
[ wei: port to rumprun ]
Signed-off-by: Wei Liu <liuw@liuw.name>
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