Investigate why user heap isn't mapped

See merge request redox-os/kernel!147

Took me way too long to spot this :D

Deprecate the original fmap/funmap

See merge request redox-os/kernel!146

The cool thing here is that we're temporarily binary compatible with the
old stuff, so if anyone would use an old version of redox_syscall we can
easily find them with these prints.

Log experiment

See merge request redox-os/kernel!144

This opens the door to completely elimnating println! usage from the
kernel.

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

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

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>

Implement Debug for a couple structs.

See merge request redox-os/kernel!142

Replace llvm_asm with asm

See merge request redox-os/kernel!141

I am finding it useful to be able to pretty print Mappers and
ActivePageTable structs.

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

Support latest rust

See merge request redox-os/kernel!140

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.

Implement funmap2

See merge request redox-os/kernel!139

Implement auxiliary vector

See merge request redox-os/kernel!136