Each architecture may have a different method to enable logging. Now
that can be customized with a function passed to the init_logger
function.

Also, provide a minimal x86_64 implementation.

This is the first commit where you can see logging coming from the log
crate.

Signed-off-by: Wren Turkal <wt@penguintechs.org>

Signed-off-by: Wren Turkal <wt@penguintechs.org>

Signed-off-by: Wren Turkal <wt@penguintechs.org>

This is the first step of integrating the log crate as the main way to
log messages from the kernel.

Also, reexport all log macros. This module should eventually be the
only logging API used in the kernel.

Signed-off-by: Wren Turkal <wt@penguintechs.org>

Thanks to @4lDO2 for all this. I just moved his changes to io_uring onto
the master branch of the kernel. I take no credit.

Mainly because I think the code could be cleaner if we can remove
support entirely :)

I was an idiot and forgot rbx wasn't always backed up. As a result, we
should never ever write to it

I think we need to reimplement these functions in assembly :(

It's broken on master anyway