Layers now accept metadata dictionaries (and chain/stack them on top of
those from lower layers). Metadata can only be set at construction
time, and the metadata dictionary is readonly. The hope is this will
make enumerating metadata keys across the codebase simpler.
The current metadata items that layers hold is:
architecture (Unknown | Intel32 | Intel64)
os (Unknown | Windows | Linux)
pae (bool)
page_map_offset (int)
This patchset may develop further to help enumerate all of these
(through a registration/reporting system).
It's longer to type, but people shouldn't be typing it directly.
They should be pulling the value from the config and using that, which
can default to 'nt' if necessary.
We determine address_masks using log/ln2, which cannot accept 0.
Therefore we don't support address spaces with a maximum_address of 0.
This can affect registry hives, so we've added a check in registry hives
to prevent creating layers with invalid maximum_addresses.
Really need to figure out how to deal with _HBIN and _HCELL for
systems that don't have those structures. The format seems extremely
unlikely to change, but better not to hard code anything if avoidable.
Mike Auty