Open source implementation of config system module.
With intent of being a documentation supplement, but also working as replacement.
Also in mind trying to make result binary as small as possible.
As much as I tested it, use at your own risk.
Just run make.
It will create a cxi file, for Luma3DS before version 12.0, you can extract code.bin and exheader.bin with ctrtool, or some other tool, to place it in /luma/titles/0004013000001702/, otherwise for Luma3DS 12.0+ you can copy the cxi /luma/sysmodules/ and rename it to 0004013000001702.cxi.
This requires game patching to be enabled on luma config on Luma3DS less than 12.0, requires external module loading on versions newer or equal to 12.0.
This code itself is under Unlicense. Read LICENSE.txt
The folders source/3ds and include/3ds have source files taken from ctrulib, with modifications for the purpose of this program.
Copy of ctrulib's license in LICENSE.ctrulib.txt
Ctrulib changed to generate smaller code, slimmed down sources and headers for a quicker read, and not depend on std libraries.
As well some changes to behavior on result throw.
SVCs were also made inlinable by making static inline functions that use __asm__ and explicit register variables instead.
What's not part of the original ctrulib, as of time of this code release, is the spi and i2c related service handle code.
PS RSA structure is also modified.
IPC header has extra functions to make cmdbuf checks easier as a service.
Additionally __cplusplus checks for extern "C" without using base 3ds.h