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design principles
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Use strict ANSI C99. This means no inline-assembly. This means
we have to write assembly routines if we need things not available
in C (lgdt, in, out, etc.).
Make sure it compiles with every ANSI C99 compiler (gcc, clang, tcc, ...).
Use only very simple makefile rules. Make sure we could also just
use a simple shell script to compile the kernel.
Avoid implementation and using of unsafe C functions. Provide safe
counterparts wherever possible. There are of course exceptions like
scrolling the VGA buffer with a memmove.
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