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 current drivers/framework.c is useless, as REGISTER_DRIVER() is a macro
that just directly calls the driver probe function. Every board file has to
reference each driver's probe function by name. This was just done to make room
for proper driver probing in the future, where we are now, so implement that.
Make drivers self-register at link time by emitting a struct driver into a
.uniloader_drivers section via DRIVER_REGISTER(). The linker brackets
the section with __drivers_start / __drivers_end symbols.
Boards describe their hardware as a static struct with the format
{ driver_name, plat_data, label }. Remove the drivers_init hook from
struct board_ops as it's no longer necessary.
The drivers probe will now be placed between early_init and splash.
The framework looks up each device's driver_name up in the
linker section and calls probe(plat_data). A failed probe is logged.
Do --whole-archive as well to convince the linker to not drop the drivers
in archived .o files that aren't called outside the archive.
Adopt all boards to use the framework.
All of the changes in this commit are co-dependent on each other, as we're
doing a large change to the ABI.
get_font_scale_factor() unconditionally dereferences fb_info and debug.c's
fb_output() calls get_font_scale_factor() on each printk call, even before
we have simplefb registered. As __simplefb_raw_print has a check if we're
past simplefb probe (fb_info is filled), do the same for get_font_scale_factor()
and return 1 (not scaled) if the struct is not filled.
The value 5 appeared bare in two places: simplefb.c (when text wraps
past the bottom of the screen) and debug.c (initial y position for
the printk overlay). Replace both with FB_TEXT_TOP_PADDING defined
once in simplefb.h.
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.
This is never used. And produces a build warning. It may be added later
if necessary.
Signed-off-by: Igor Belwon <igor.belwon@mentallysanemainliners.org>
As we can make use of the video_info struct for base address,
this argument is not required anymore and only breaks havoc on
boards that don't set the CONFIG option.
Jokes aside, commit adds support for colored indexes based on the
loglevel, introduces a better simplefb probing that does not depend
on hardcoded config options. Implementing support for fdt should be
easier now.
With support for this board also come the following changes:
- rework blobs handling to get past the 0 size bug
- basic cpu "set up" in start.S
- assembly memcpy
- uart debugging
Speedy is a serial communication bus that is typically used in
Exynos SoC devices for communicating with a PMIC. Implement
basic support for it, as well as add its first user - s2mps17 in
board-dreamlte.
Also, while at it, implement a simple readl function.
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
This actually breaks the armv7 port. It has to be revisited in the
future, since it not only is not compilable right now, but also
cannot boot linux properly. TODO
Also introduce a new C-based __memcpy_optimized that does not
cause an exception on some devices when copying the initramfs.
This issue has to be debugged further.
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
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>
Move onto using asmdefs macros in assembly files. Implement an
assembly-based memcpy for aarch64 and a C-optimized memset, while
also making place for replacing functions with more optimized ones
in the future.
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
arch: aarch64: Load addresses via page + offset
arch: aarch64: Align the TEXT region
drivers: Introduce an empty framework
board: Rework to be PIC
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>
arch: Implement ARM32 support
soc: Implement ARM32 support for MSM8916
board: Implement ARM32 support for Samsung Galaxy J5 2015
include: main: Revert built-in memcpy, rearrange and add support for writel
lib: simplefb: Make the clear screen function usable
Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Cc: Efim Girjeu <efimgirjeu@gmail.com>
