Performing a flicker-free boot involves being able to ensure that we don't
write to the memory that's currently being scanned out, which means we need
to be able to allocate a block that matches the current framebuffer in
order to prevent that. This adds support for reading out the current
Performing a flicker-free boot involves being able to ensure that we don't
write to the memory that's currently being scanned out, which means we need
to be able to allocate a block that matches the current framebuffer in
order to prevent that. This adds support for reading out the current
