STRUCT ISST_IF_IO_REG(9)

✨ struct isst_if_io_reg(9) ✨

okay so bestie, buckle up because we're diving into the Kernel API Manual and this one is literally called struct isst_if_io_reg — it's the "Read write PUNIT IO register" situation and it's giving very much "small struct, big job" energy 💅

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🌸 NAME 🌸

struct isst_if_io_reg — Read write PUNIT IO register 🎀

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🦋 SYNOPSIS 🦋

no cap, here's the whole thing, character for character, don't touch it:

struct isst_if_io_reg {
    __u32 read_write;
    __u32 logical_cpu;
    __u32 reg;
    __u32 value;
 };

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💖 Members 💖

lowkey the most important part, so pay attention bestie 🫶

• read_write — Value 0: Read, 1: Write. that's it, that's the whole vibe check ⭐
• logical_cpu — the Logical CPU number, which you use to get the target PCI device 🔥
• reg — the PUNIT register offset, iykyk 💜
• value — for a write operation this is the value to write; for a read it's a placeholder read value 🙈

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🧚 Description 🧚

It's the structure you use to specify read/write data to PUNIT registers ✨ like, that's genuinely the whole description and honestly? iconic. it knows what it is 👑

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🌈 SEE ALSO 🌈

the whole friend group, fr fr — go say hi to all of them 💫

• Kernel file ./include/uapi/linux/isst_if.h struct
• isst_if_platform_info(9), struct isst_if_cpu_map(9), struct isst_if_cpu_maps(9), struct isst_if_io_regs(9), struct isst_if_mbox_cmd(9), struct isst_if_mbox_cmds(9), struct isst_if_msr_cmd(9), struct isst_if_msr_cmds(9), struct isst_core_power(9), struct isst_clos_param(9), struct isst_if_clos_assoc(9), struct isst_if_clos_assoc_cmds(9), struct isst_tpmi_instance_count(9), struct isst_perf_level_info(9), struct isst_perf_level_control(9), struct isst_perf_feature_control(9), struct isst_perf_level_data_info(9), struct isst_perf_level_fabric_info(9), struct isst_perf_level_cpu_mask(9), struct isst_base_freq_info(9), struct isst_turbo_freq_info(9)

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bestie reminder: this page lives in ./include/uapi/linux, dated October 2026, and it's filed under struct isst_if_io_reg(9) — screenshot it, cite it, slay it 💅🌸

okay that's the whole page, mwah, go read the other structs, ily, bye 🎀🦋💖