I saw your post about your rust kernel. Did you ever figure out what was wrong?
Also have you tried using QEMU? First I would verify that your serial code is actually running. You could triple fault the x86_64 to detect if it reaches a certain point. Also setup of serial port on QEMU for x86_64 is very easy. All you do is send the data and check the buffer. I have some great example Rust code. Now real hardware is different because it can be touchy if you dont properly intialize it. Your code looks good okay so im wondering if it can be verified as running - like I said QEMU can help you diagnose simple problems thsy will be present in real hardware. Also be aware of QEMU monitor mode which lets you dump the CPU registers during runtime so you can see exactly what the CPU is executing. Let me know because I can likely help you a bunch.
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