For a while now, both simple-framebuffer and uart were hard-wired to
the debug library. You could alternate between each or have both running,
but the implementation was really ugly - ifdefs based on whether uart/simplefb
are compiled in or not.
As uniLoader has advanced enough to feature a sane-ish probing system for
drivers, we can start experimenting with things like:
- multiple framebuffers / UART devices
- support for more complex peripherals (USB, storage)
- multiple boot paths
Hence registering output sinks as console devices, just like how u-boot and
linux do, is a feature we should've had a long while ago. So let's begin working
on that by decoupling framebuffer and uart from the "debug" interface in uni and
rather allowing the registering of such sinks as "console" devices.
With that, make the simple-framebuffer driver handle the debug level colors as
well as the message assembling and writing to the framebuffer. That fully detaches
it from the debug interface, as all that is required now is to invoke console_register()
with the appropriate struct passed as an argument.
As the drivers for output sinks are now responsible for the formatting of the messages,
their set-up and writing, UART can be implemented as a sole driver as well. However,
drivers register late in the boot process (after assembly, board early_initand other
drivers with higher priority). With that in mind and all the leftover UART puts/c code in
board files for several of the currently supported devices, introduce an early console
path dedicated for debugging via UART.
Looking at the currently supported devices, the only one requiring set-up before
being able to output to UART is lucky7. For ease of use, make early_console_init
weak, allowing it to be overrided by board files such as board-lucky7.
Lastly, debug -> console, as that more correctly addresses the purpose of the library
now.
The framebuffer scaling code was not tested on armv7 due to no
current platforms making use of simplefb. Turns out the compiler
wants a set of aeabi helpers for divisions, not present due to
the bare metal nature of the bootloader. Satisfy this with empty
stubs.
Implement 8 loglevels to use with printk:
While at it, separate the font in a new "video" directory, which
also makes space for a proper video probing implementation. Fill
in the font from 32 to 256. Scale the font to render twice as big.
Implement dynamic line length detection. Change a few things here
and there to follow the linux kernel code style. Add a nice logo.
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
unic is a small library of C functions that is currently written
in plain C. It's purpose isn't to be fast, but "universal" - as
in include as little architecture-specific code as possible.
The old neatlibc still resides, but isn't being built. There is
still more to do, including implementation of memory management,
so keep it there for now.
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Make 2 different folders for armv7 and aarch64 assembly neatlibc
functions. Add the neatlibc submodule, make it work against the
Makefile system. Pray.
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
