STRUCT IPC_MSG_PREP_MAP(9)

💅 struct_ipc_msg_prep_map(9) — the Kernel API Manual, bestie edition 🎀

okay so before we even start: this is page struct ipc_msg_prep_map(9) straight out of the Kernel API Manual, and yes we're gonna read it together like it's the group chat lore. sit down, grab a strawberry drink 🍓, it's genuinely not that deep.

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✨ NAME ✨

struct ipc_msg_prep_map — it's the struct for the map argument for message preparation. that's it, that's the whole vibe. it's the little bundle of info you hand over when something needs to get mapped 🗺️

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🌸 SYNOPSIS 🌸

here's the shape of it, exactly as written, no notes:

struct ipc_msg_prep_map {
    unsigned int region_id;
    unsigned long addr;
    size_t size;
 };

like. look at her. three members, zero drama, main character energy 👑

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🦋 Members 🦋

• region_id — the region to map. which region? this one. she's an unsigned int and she knows it 💜
• addr — the Pcie addr of the region to map. yes, that's literally what it says, "Pcie addr" — i'm not fixing the capitalization, that's the original's business, not mine 🙈
• size — the size of the region to map. a size_t, so she's flexible. we love a flexible queen ✨

ngl there is no deep lore here — this struct is literally just "which region, where's it at, how big is it." three fields, one job, ate 💅

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🔥 SEE ALSO 🔥

okay this is the part where the page just starts name-dropping the entire extended universe, and honestly? i'm obsessed. the Kernel file is ./drivers/net/wwan/iosm/iosm_ipc_protocol_ops.h — that's the source of truth, go say hi 🌈

and then, in the order they're listed (i'm not skipping a single one, i would never 😭):

• enum ipc_mem_td_cs(9)
• enum ipc_mem_msg_cs(9)
• struct ipc_msg_prep_args_pipe(9)
• struct ipc_msg_prep_args_sleep(9)
• struct ipc_msg_prep_feature_set(9)
• struct ipc_msg_prep_unmap(9)
• union ipc_msg_prep_args(9)
• enum ipc_msg_prep_type(9)
• struct ipc_rsp(9)
• enum ipc_mem_msg(9)
• struct ipc_mem_msg_open_pipe(9)
• struct ipc_mem_msg_close_pipe(9)
• struct ipc_mem_msg_abort_pipe(9)
• struct ipc_mem_msg_host_sleep(9)
• struct ipc_mem_msg_feature_set(9)
• struct ipc_mem_msg_common(9)
• union ipc_mem_msg_entry(9)
• ipc_protocol_msg_prep(9)
• ipc_protocol_msg_hp_update(9)
• ipc_protocol_msg_process(9)
• ipc_protocol_ul_td_send(9)
• ipc_protocol_ul_td_process(9)
• ipc_protocol_dl_td_prepare(9)
• ipc_protocol_dl_td_process(9)
• ipc_protocol_get_head_tail_index(9)
• ipc_protocol_get_ipc_status(9)
• ipc_protocol_pipe_cleanup(9)
• ipc_protocol_get_ap_exec_stage(9)
• ipc_protocol_pm_dev_get_sleep_notification(9)

like, twenty-nine whole references. she has friends 🫶 go read them, iykyk.

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aaaand that's the page!! short and sweet, just how we like it. this little icon came from ./drivers/net/wwan/iosm and it's dated October 2026 — so yeah, she's got a timestamp and she's not afraid to use it ⭐

later bestie, go map some regions responsibly 💖🧚