Make kernel log buffer derived from cmake config

This removes the explicit CMake configuration for the kernel log buffer
and replaces it with a #define that is enabled for the required
configurations.

Signed-off-by: Curtis Millar <curtis@curtism.me>

Convert license tags to SPDX identifiers

This commit also converts our own copyright headers to directly use
SPDX, but leaves all other copyright header intact, only adding the
SPDX ident. As far as possible this commit also merges multiple
Data61 copyright statements/headers into one for consistency.

style: consistently attach return type

Add attach-return-type to astyle

style: consistently align pointer with name

Run astyle with align-pointer=name

Allow Arch_finaliseCap to return cleanup information

Changes Arch_finaliseCap and Mode_finaliseCap to return the same finaliseCap_ret_t type
as finaliseCap. This allows the Arch and Mode specific functions to define cleanup
information of its capabilities if necessary, just like the generic capabilities can
in finaliseCap.

x86: Unmap pages when delete non final frame caps

Unlike other paging structure objects, each frame capability can hold a different mapping,
which should be unmapped. Previously we only performed an unmapping if we were deleting
the final frame capability, which meant if frame capabilities were deleting in the correct
order you could delete the final capability without first unmapping all usages of the
frame.

SELFOUR-1062: Hide all IOMMU related code behind #ifdef guards

The IOMMU implementation is not going to be verified at the moment, and so the code for
it needs to be hidden from verification, which we do by #ifdef'ing it out if the IOMMU
is not enabled. As a result the IOMMU configuration depends on a non verification target

SELFOUR-501: x86 - Remove PAE support

Remove recycle

Removes the recycle operation and adds an operation
to cancel any badged sends on and endpoint. Calling
Revoke + CancelBadgedSend is equivalent to Recycle
on a badged endpoint

SELFOUR-634: support for TLB and cache management

SELFOUR-444: Preemptible zeroing for retype.

Change to the order of operations and timing behaviour of
invokeUntyped_Retype. The Retype operation now zeroes the
entire range of the Untyped cap (if it is being used for
the first time) before installing any objects. This avoids
the need for long-running initialisation of large objects,
whose initial contents are always zero. The initial zeroing
phase is preemptible, and may take multiple timeslices to
complete.

SELFOUR-287: 32-bit vt-x implementation

This is an implementation of vt-x for x86 kernels running in
ia32 mode.

x86: Rename invalidateTLBentry->invalidateTLBEntry

[STYLE_FIX]

x86: Fixup IOMMU implementation

Adds a mapping type to frame caps that tracks
what kind of hierarchy the cap is mapped into;
an MMU, IOMMU and in the future an EPT structure.

Additionally the IOMMU code is updated to
have correct functionality and be verification
friendly.

SELFOUR-421 Introduce explicit device frames and untypeds

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

SELFOUR-556: Rationalize BITS vs INDEX_BITS

s/PT_BITS/PT_INDEX_BITS
Current convention is to say that X_BITS is the log base 2
size of an object, not the log base 2 number of indices

SELFOUR-518: User-level log buffer

Remove global ksLog and use KS_LOG_PPTR instead

Benchmark - Log buffer: use global page table

x86: Use IO page table size defined in libsel4

x86: Rename ia32->x86

This is a stylistic commit to make names of variables/constants and
functions in the kernel more consistent. That is, things that are
not IA32 specific, but are generic x86, get renamed to having an
x86 name

x86/libsel4: Rename ia32->x86

Rename all functions, constants and types in libsel4 that are in the
general x86 architecture to have an X86 name instead of an IA32 name.
As libsel4 and the kernel share names this requires changing those
in the kernel as well.

All the original IA32 names can still be used for the moment, but are
marked as deprecated.

SELFOUR-399: object sizes and globals frame addr should come from the same source

x86: Factor out IA32 specific objecttype code