REG_FIELD_GET64(9)

💖 REG_FIELD_GET64(9) 💖

okay so bestie, this is a page from the Kernel API Manual and it's literally about pulling a u64 bitfield value out of stuff. tiny page, immaculate vibes, let's go 🫶

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✨ NAME ✨

REG_FIELD_GET64 — extract a u64 bitfield value. that's it. that's the whole job. iconic honestly 👑

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🌸 SYNOPSIS 🌸

REG_FIELD_GET64 (__mask , __val );

yes the spacing is giving "written at 3am" but it's valid, don't come for it 😭

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🎀 ARGUMENTS 🎀

• __mask — the shifted mask that defines the field's length and its position. it's the little map that says "the bits you want live riiiight here" 🗺️
• __val — the value you're extracting the bitfield value from. the source material. the main character 💅

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🦋 DESCRIPTION 🦋

so this is a local wrapper for FIELD_GET, and it exists for two whole reasons:

1. to force u64 (no cap, it's a u64 situation) 🔥
2. for consistency with REG_GENMASK64 — they're a matching set, iykyk ✨

that's it. that's the description. short and slay.

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⭐ RETURN ⭐

you get back the masked and shifted value of the field defined by __mask in __val. so it's been masked, it's been shifted, it's ready for its close-up 💖

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🌈 SEE ALSO 🌈

• kernel file ./include/drm/intel/reg_bits.h — that's where the whole family lives 🏠
• REG_FIELD_PREP8(9)
• REG_FIELD_PREP16(9)
• REG_FIELD_PREP(9)
• REG_FIELD_GET8(9)
• REG_FIELD_GET(9)
• REG_FIELD_MAX(9)

the whole friend group fr fr 🫶

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💀 reminder bestie: this is a local wrapper, so don't go looking for it in the big wide kernel — it's hanging out in the intel drm headers with its besties.

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mwah 💋 that's the page! brought to you from ./include/drm/intel, dated October 2026 — so yes, this manual is lowkey from the future and it's still serving. stan. 🧚‍♀️✨