STRUCT X86_INIT_TIMERS(9)

💅 struct x86_init_timers(9) — the x86 kernel API manual, bestie edition ✨

okay so this page is struct x86_init_timers(9) from the Kernel API Manual, and it's literally the glow-up plan for platform specific timer setup on x86 🎀 like, it's not a function you call, it's a lil struct full of function pointers that the platform fills in so the kernel knows how to wake up its clocks. iykyk.

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✨ NAME ✨

struct x86_init_timers — platform specific timer setup 🌸

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🦋 SYNOPSIS 🦋

here's the whole vibe, verbatim, don't touch it:

struct x86_init_timers {
    void (*setup_percpu_clockev)(void);
    void (*timer_init)(void);
    void (*wallclock_init)(void);
 };

three function pointers, all void in, void out, no arguments, no return value. minimal. clean. iconic. 👑

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💖 Members 💖

okay bestie, let's meet the three of them one by one:

• setup_percpu_clockev — this one is the one that sets up the per cpu clock event device for the boot cpu 🔥 so like, the boot cpu gets its clock event device sorted. that's the whole job.
• timer_init — this bad boy initializes the platform timer (default PIT/HPET) ⏰ no cap, the default is PIT/HPET, and the platform gets to say otherwise if it wants.
• wallclock_init — and this cutie here inits the wallclock device 🕰️ that's it, that's the description, she's simple and she knows it.

ngl all three are void (*)(void) so there's zero drama with arguments or return values. just vibes and side effects 💀

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🌈 SEE ALSO 🌈

if you're the kind of girl who reads the whole header file (and you should be), here's the full friend group 🫶:

Kernel file ./arch/x86/include/asm/x86_init.h 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_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), enum x86_legacy_i8042_state(9), struct x86_legacy_features(9), struct x86_hyper_runtime(9), struct x86_platform_ops(9)

they all live together in x86_init.h and honestly? the way they all just hang out in one header. main character energy for real 💜

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and that's the page, bestie!! 🧚 sign-off time: this one comes to you from ./arch/x86/include/asm, and the page date is October 2026 ⭐ go forth and initialize those timers, slay 💅💖