STRUCT BDB_HEADER(9)

💖 struct bdb_header(9) 💖

okay so bestie, welcome to section 9 of the Kernel API Manual — this one's about struct bdb_header, and it's literally the little name tag at the front of the BDB (that's the BIOS Data Block, iykyk). Think of it as the header shiny enough to have main character energy. 🎀

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✨ NAME ✨

struct bdb_header — the BDB Header structure. like, the actual struct. no cap. 💅

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🌸 SYNOPSIS 🌸

struct bdb_header {
    u8 signature[16];
    u16 version;
    u16 header_size;
    u16 bdb_size;
 };

look at her. four fields. iconic. 👑

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🦋 Members 🦋

• signature — the BDB signature, and it is exactly the string "BIOS_DATA_BLOCK" — like, the whole vibe check of the block, fr fr. ✨
• version — the version of the data block definitions. yes queen, we're keeping track of which flavor we're on. 💜
• header_size — the size of this structure. she knows her own measurements, obsessed. 🎀
• bdb_size — the size of the BDB, meaning the BDB Header plus the data blocks. the whole package, not just the bow on top. 🫶

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🌈 SEE ALSO 🌈

• the kernel file ./drivers/gpu/drm/i915/display/intel_vbt_defs.h — go read her, she's got the definitions bestie 💖
• struct vbt_header(9) — her sibling, equally slay ⭐

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ngl this one's short and sweet, but every field matters — don't skip the signature check or the size math, that's where the 💀 lives.

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and that's the tea! 🍓 straight from ./drivers/gpu/drm/i915/display, dated October 2026 in the struct bdb_header(9) manual page — mwah, go forth and parse those headers, bestie 🧚💖