STRUCT MEI_EXT_HDR_GSC_F2H(9)

💖 struct mei_ext_hdr_gsc_f2h 💖

okay so this is from the Kernel API Manual bestie, and it's literally the struct that describes the gsc firmware to host interface. no cap, that's the whole vibe. it's giving "handshake between firmware and host" energy 🫶

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✨ NAME ✨

struct mei_ext_hdr_gsc_f2h — gsc firmware to host interface 💅

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🎀 SYNOPSIS 🎀

struct mei_ext_hdr_gsc_f2h {
    struct mei_ext_hdr hdr;
    u8 client_id;
    u8 reserved;
    u32 fence_id;
    u32 written;
 };

look at her. five fields. flawless. no notes. 🌸

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🦋 Members 🦋

• hdr — the extended header, literally the header part of the header situation 💫
• client_id — it's either GSC_HECI_MSG_KERNEL or GSC_HECI_MSG_USER, pick your fighter 👑
• reserved — reserved. that's it. that's the field. don't touch it bestie 🙈
• fence_id — the synchronization marker ✨ (fences keep things in order, iykyk)
• written — the number of bytes written to firmware, the receipts of byte counts fr fr 🔥

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🌈 SEE ALSO 🌈

Kernel file ./drivers/misc/mei/hw.h plus the whole extended family — go say hi to all of them:

• enum mei_hbm_status(9)
• enum mei_ext_hdr_type(9)
• struct mei_ext_hdr(9)
• struct mei_ext_meta_hdr(9)
• struct mei_ext_hdr_vtag(9)
• mei_ext_begin(9)
• mei_ext_last(9)
• struct mei_ext_hdr_gsc_h2f(9)
• mei_ext_next(9)
• mei_ext_hdr_len(9)
• struct mei_msg_hdr(9)
• struct mei_hbm_cl_cmd(9)
• enum hbm_host_enum_flags(9)
• struct hbm_host_enum_request(9)
• struct mei_client_properties(9)
• struct hbm_add_client_request(9)
• struct hbm_add_client_response(9)
• struct hbm_power_gate(9)
• struct hbm_client_connect_request(9)
• struct hbm_client_connect_response(9)
• struct hbm_notification_request(9)
• struct hbm_notification_response(9)
• struct hbm_notification(9)
• struct hbm_dma_mem_dscr(9)
• struct hbm_dma_setup_request(9)
• struct hbm_dma_setup_response(9)
• struct hbm_dma_ring_ctrl(9)
• struct hbm_capability_request(9)
• struct hbm_capability_response(9)
• struct hbm_client_dma_map_request(9)
• struct hbm_client_dma_unmap_request(9)
• struct hbm_client_dma_response(9)

like, that's a whole friend group and they ALL showed up to the function 😭💜

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that's the page bestie, mwah 💋 — brought to you by ./drivers/misc/mei, dated October 2026, and titled struct mei_ext_hdr_gsc_f2h(9) if you need to cite her later 🎀✨ slay