ENUM X86_LEGACY_I8042_STATE(9)

✨ enum x86_legacy_i8042_state 💅

okay bestie, so this is a page from the Kernel API Manual and it's all about enum x86_legacy_i8042_state — literally just the enum that keeps track of what's going on with your i8042 keyboard controller 🎹✨ it's giving "small enum, big responsibilities" and honestly? iconic.

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🌸 NAME 🌸

enum x86_legacy_i8042_state — the i8042 keyboard controller state, fr fr 🫶

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🎀 SYNOPSIS 🎀

enum x86_legacy_i8042_state {
    X86_LEGACY_I8042_PLATFORM_ABSENT ,
    X86_LEGACY_I8042_FIRMWARE_ABSENT ,
    X86_LEGACY_I8042_EXPECTED_PRESENT

};

like, that's the whole enum, no cap. three constants, three moods 💅

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🦋 CONSTANTS 🦋

okay so these are the three possible states, and each one is a whole vibe:

• X86_LEGACY_I8042_PLATFORM_ABSENT — the controller is always absent on the given platform/subarch. like not "we couldn't find it", not "it's hiding" — it genuinely does not exist here, periodt 💀
• X86_LEGACY_I8042_FIRMWARE_ABSENT — firmware reports that the controller is absent. so the firmware said what it said, and we're just relaying the message 🙈
• X86_LEGACY_I8042_EXPECTED_PRESENT — the controller is likely to be present, and the i8042 driver should probe for controller existence. key word: likely 👀 so go check, bestie, don't just assume 🔥

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👑 SEE ALSO 👑

so if you wanna go down the rabbit hole (and you should, it's lowkey a whole ecosystem), the kernel source file is at ./arch/x86/include/asm/x86_init.h, and it's hanging out with all these icons:

• struct x86_init_mpparse(9)
• struct x86_init_resources(9)
• struct x86_init_irqs(9)
• struct x86_init_oem(9)
• struct x86_init_paging(9)
• struct x86_init_timers(9)
• struct x86_init_iommu(9)
• struct x86_init_pci(9)
• struct x86_hyper_init(9)
• struct x86_init_acpi(9)
• struct x86_guest(9)
• struct x86_init_ops(9)
• struct x86_cpuinit_ops(9)
• struct x86_legacy_devices(9)
• struct x86_legacy_features(9)
• struct x86_hyper_runtime(9)
• struct x86_platform_ops(9)

like, that's the whole friend group right there 🌈⭐

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reminder bestie: X86_LEGACY_I8042_EXPECTED_PRESENT is expected, not guaranteed — the driver still has to probe, so don't go writing code that assumes the controller is there just because the enum said "likely" 😭

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anyway that's the page!! source livin' in ./arch/x86/include/asm, dated October 2026, manual section enum x86_legacy_i8042_state(9) — drink water, read your headers, and slay the day 💖🧚🍓