jornada_ssp_reverse(9)

📦 version 7.3.1, in nixpkgs unstable

✨ jornada_ssp_reverse ✨

Okay bestie, so this is a page from the Kernel API Manual — section 9, kernel developer vibes only 💅 — and it's all about jornada_ssp_reverse, one tiny little function with one very specific job. Let's get into it 🫶

🌸 NAME 🌸

jornada_ssp_reverse — reverses input byte

That's it. That's the whole personality. It takes a byte and flips it around backwards. Iconic, honestly 🎀

🦋 SYNOPSIS 🦋

u8 jornada_ssp_reverse (u8 byte );

So you call it, you hand it a u8, and it hands you back a u8. No drama, no extra args, no surprises. Slay ✨

🍓 ARGUMENTS 🍓

  • byte — the input byte you want reversed 💖

That's the one and only thing you pass in. Just the byte. Give it a byte, bestie, and it does its little reverse thing.

💜 DESCRIPTION 💜

So here's the tea ☕ — according to the page, we need to reverse all data we receive from the mcu due to its physical location. That's the reason. That's the entire reason. The mcu is sitting somewhere physically inconvenient, so every byte coming back from it gets flipped before we can use it. Not a bug, not a hack, just... where the hardware happens to live 🙈

So this little function is the one that does that flip. Literally its whole arc.

🔥 RETURN 🔥

The page gives you the example in pure bit form, and honestly it's giving art:

01110111 -> 11101110

So 01110111 comes in, 11101110 goes out. Byte in, mirrored byte out. No cap 💀

🌈 SEE ALSO 🌈

Go poke around in the kernel file ./arch/arm/mach-sa1100/jornada720_ssp.c if you're nosy (and you should be, lowkey 👀), plus these besties right here:

Whole little ssp friend group. Go say hi 🧚

Heads up, bestie — this page doesn't spell out what happens with weird edge cases or anything beyond the flip itself, so don't go inventing behaviour. What's written is what you get 💅

Okay that's the whole page, mwah 💖 This little cutie comes to you from ./arch/arm/mach-sa1100 and the date on it is October 2026 — go forth and reverse those bytes, you absolute main character 👑⭐

jornada_ssp_reverse(9) 🎀

📦 where this page comes from