Add the fundamental filesystem structure to attach a VirtualIO 9p
device. With the implementation of VirtIO 9p devices (lk/dev/virtio/9p),
we can use those APIs to connect to a shared folder as a LK filesystem.
Signed-off-by: Cody Wong <codycswong@google.com>
- Add the v9p support for arm platform.
- Add an option `-f` to set the shared directory on the host machine to
`do-qemuarm`.
- For example, to use the v9p dir sharing, run the script as:
```
# under `lk/` run the follow command will share the current
# directory `lk/` within LK vm as VirtIO 9p device
scripts/do-qemuarm -f .
```
Signed-off-by: Cody Wong <codycswong@google.com>
No real change except moving fdt walking code into the fdtwalk library.
Also update some constants for ARM virt and bump the load address to
make sure the FDT works. Turns out it had been missing for a while so it
was actually not finding it because the kernel was loaded too close to
the start of memory.
