Currently we are checking if the function returns nonzero. This is fine,
however it adds a lot of bloat, for example the late_init initcall is
practically never used and is only a stub function that returns zero. So
- add a proper initcall macro to prepare for cleaning up unused stubs.
Signed-off-by: Igor Belwon <igor.belwon@mentallysanemainliners.org>
Since we don't have to worry about writing positionally-independent
code, we can safely pass around globally defined structures and
have more fun with pointers without falling into UB.
All newer exynos devices with s-boot have the "feature" of placing the
android kernel at a random location in dram, specifically around
0x80000000 and 0x83000000. This made it hard to assume where we are at,
hence why we made everything as PiE (position-independent) as possible.
This, however, resulted in a lot of issues. I usually managed to get
around them with ugly hacks, but in the last 5-6 commits, with the
fixed support for armv7, everything fell apart for arm64.
So, the solution for this is to implement code at the beginning
of the bootloader that relocates it to a safe place in memory.
This is currently enabled for dreamlte, and it must be enabled
and configured for all other boards with that issue. Otherwise they
will NOT boot anymore. Boards that don't need this can keep
CONFIG_POSITION_INDEPENDENT disabled.
This will be useful for tracking bugs of users in the future. Also
lowercase each print and drop exclamation marks because I like this
aesthetic of unofficialness a bit better.
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
When the board_data is initialized at compile time, it is placed into
the data section, which doesn't get relocated by the linker. The resulting
address of the board_data that is passed to board_init lies within reserved
memory and the device crashes.
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>
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>
This is meant to replace the current Kconfig / SoC / Board files
configuration, which is ugly and annoying to maintain. Begin
by creating the board files registration framework and
transitioning all exynos boards to it. This also opens room for
creating the drivers registration framework in the future.
All non-samsung boards will be no longer able to do their board
configuration until they're also transitioned.
Every new board must have the following structure:
struct board_data default_board = {
.name = "DEFAULT",
.init = NULL,
.late_init = NULL,
.driver_setup = NULL,
};
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>
