These files exist for these reasons:

• boot.s - kernel entry point that sets up the processor environment
• kernel.c - your actual kernel routines
• linker.ld - for linking the above files

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Keeping this here for now, might need to change entry later, also link-args for rustc might be outdated.

Linux

cargo rustc -- -C link-arg=-nostartfiles

Windows

cargo rustc -- -C link-args="/ENTRY:_start /SUBSYSTEM:console"

macOS

cargo rustc -- -C link-args="-e __start -static -nostartfiles"

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Interesting unstable rust features that might be useful

Custom test frameworks:

• https://doc.rust-lang.org/beta/unstable-book/language-features/custom-test-frameworks.html

Inline Const Pattern:

• https://doc.rust-lang.org/beta/unstable-book/language-features/inline-const-pat.html

Inline Const:

• https://doc.rust-lang.org/beta/unstable-book/language-features/inline-const.html

Negative Impls:

• https://doc.rust-lang.org/beta/unstable-book/language-features/negative-impls.html