Kernel objects cannot be created from device untypeds, with the
exception of frames, which do not get zeroed and cannot be used
as an IPC buffer. Device untypeds additionally cannot be used
in the construction of ASID pools.
This then changes the API to the rootserver (i.e. bootinfo) to
send device untypeds instead of device frames. On ARM these
device untypeds are the same as the previously exported device
frame regions. On x86 PCI scanning is removed and all physical
memory addresses (that are not important for kernel integrity)
are released to the user.
In order to have bits in the frame and untyped caps on ARM the
number of software ASIDs had to be reduced from 2^18 to 2^17,
and the maximum untyped size reduced from 2^31 to 2^30
Its probable this was meant to be a boolean flag to represent
whether or not the TCB had a bound notification object. However,
this field is unused and its presence is confusing.
Diminish rights were to prevent a user from sending a writeable
cap over a read only endpoint. It turns out this 'security' can
be worked around without difficulty (by putting caps in a cnode
and sending the cnode) making the current diminish rights
implementation functionally useless.
Removing diminish rights has the benefit of simplifying all the
IPC paths.
mode directories
This commit is 'broken' as it leaves the repository in an unbuildable state.
The purpose of having this commit is so that there is a commit where the
modifications to these files is *just* a rename, making it easier to merge
these changes into other branches.
2015-12-14 12:48:12 +11:00
Renamed from include/object/structures.bf (Browse further)
