STRUCT FEATURE_OFFSET(9)

🦋 STRUCT FEATURE_OFFSET(9) — the Kernel API Manual era 🦋

okay bestie, buckle up, because we're looking at struct feature_offset from the Kernel API Manual and honestly? she's small, she's packed, she's iconic ✨

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🌸 NAME 🌸

struct feature_offset — literally just the offsets to SST-PP features, that's the whole vibe 💅

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✨ SYNOPSIS ✨

struct feature_offset {
    u64 pp_offset :8;
    u64 bf_offset :8;
    u64 tf_offset :8;
    u64 reserved :40;
 };

look at her. four fields. not one wasted bit. main character energy fr fr 🫶

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🎀 MEMBERS 🎀

• pp_offset — the qword offset within the PP level for the SST_PP register bank 💖
• bf_offset — the qword offset within the PP level for the SST_BF register bank 🌸
• tf_offset — the qword offset within the PP level for the SST_TF register bank 🦋
• reserved — reserved for future use 🙈 (she's just sitting there, holding space, being patient, we love her for it)

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👑 DESCRIPTION 👑

so this structure is used to store offsets for SST features in the register bank. that's the whole job. no cap.

and the important part: it's packed to the same format as defined in the specifications ⭐ like, the layout is not vibes-based, it's spec-based, and you gotta respect that 🔥

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🌈 SEE ALSO 🌈

Kernel file:

./drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c

and the whole friend group of structs, all together, all slaying:

• struct sst_header(9)
• struct cp_header(9)
• struct pp_header(9)
• struct levels_offset(9)
• struct pp_control_offset(9)
• struct pp_status_offset(9)
• struct perf_level(9)
• struct tpmi_per_power_domain_info(9)
• struct tpmi_sst_struct(9)
• struct tpmi_sst_common_struct(9)
• map_cdies(9)
• map_partition_power_domain_id(9)

go read all of them, iykyk 💜

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lowkey a whole squad of TPMI/SST structs and they all point at each other. it's giving group chat. it's giving linked list of besties. obsessed 💀

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and that's the page!! sourced from ./drivers/platform/x86/intel/s... and dated October 2026, signing off as your girl struct feature_offset(9) 🍓🧚💖 periodt.