X86_MATCH_VFM_STEPS(9)

📦 version 7.3.1, in nixpkgs unstable

💅 X86_MATCH_VFM_STEPS(9) — a Kernel API Manual moment

okay so bestie, welcome to the X86_MATCH_VFM_STEPS(9) page, straight out of the Kernel API Manual ✨ this one's a macro for matching CPUs by their encoded vendor/family/model and a whole range of steppings, and it's lowkey iconic.

🎀 NAME 🎀

X86_MATCH_VFM_STEPS — matches on encoded vendor/family/model AND a stepping range. yes, both. she does it all 💅

✨ SYNOPSIS ✨

X86_MATCH_VFM_STEPS (vfm , min_step , max_step , data );

that's the whole vibe fr fr 🫶

🌸 ARGUMENTS 🌸

  • vfm — the encoded bits, 8 bits each for vendor, family, and model. packed cuteness 🌈
  • min_step — the lowest stepping number you want to match. the floor, the bare minimum, the "you must be at least this tall to ride" 🎢
  • max_step — the highest stepping number you want to match. the ceiling 💖 so together with min_step you get a whole stepping range, slay.
  • data — driver-specific data, or NULL. the internal storage format is unsigned long, so whatever you hand over — a pointer, a value, anything — gets cast to unsigned long internally. no cap, that's just how she stores it 🔥

🦋 SEE ALSO 🦋

this is the part where the friend group gets introduced 😭 all of these live in the kernel file ./arch/x86/include/asm/cpu_device_id.h, and honestly? obsessed with the squad:

main character energy across the board 👑 go read them, iykyk.

💀 tiny reminder bestie: data being cast to unsigned long is the internal storage format — that's the documented behaviour, don't come for me about anything else, it's literally what the page says 🙈

🌸 and that's the page! brought to you from ./arch/x86/include/asm, dated October 2026, and filed under X86_MATCH_VFM_STEPS(9) — mwah, go match some steppings, ily 🎀💜

📦 where this page comes from