I'm not an expert, but this is what I gather

What’s ABI? API compatible with linux kernel?

Application Binary Interface is the equivalent of an API but at binary level. An API defines for example the functions with their parameters, types, order, and output. An ABI defines how functions are called, how parameters are passed, how output is pass and retrieved, and so on but at a binary level.

An example of an ABI would be for example the Linux Standard Base which makes compiled binaries compatible with linux (how binaries are constructed, where to find data like constants, where to find instructions, and so on). The internal ABI is also important for example how drivers communicate with the kernel.

And what’s TCB?

That, I don't know, unfortunately :/ We need a tech glossary. If I had to guess, it's the Trusted Computing Base?

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