clocksource_mmio_init(9)

🌸 NAME 🌸

Bestie, welcome to the Kernel API Manual page for clocksource_mmio_init(9). This function does exactly what it says on the tin: clocksource_mmio_init initializes a simple mmio based clocksource. That’s the whole vibe. ✨

✨ SYNOPSIS ✨

int clocksource_mmio_init (void __iomem *base , const char *name ,
unsigned long hz , int rating , unsigned bits , u64 (*read)(struct
clocksource *) );

Yep, that’s the signature, character for character. 💅

🎀 ARGUMENTS 🎀

• base — the virtual address of the clock readout register. That’s where the clocksource reads its little heart out. 💖
• name — the name of the clocksource. Give it a cute label, bestie. 🏷️
• hz — the frequency of the clocksource, in Hz. 🕰️
• rating — the rating of the clocksource. ⭐
• bits — the number of valid bits. 🔢
• read — one of clocksource_mmio_read*() above. It’s a function pointer with the u64 (*read)(struct clocksource *) shape. 👀

Lowkey important: read is literally one of clocksource_mmio_read*() above. Don’t freelance this one. 💀

🦋 SEE ALSO 🦋

• Kernel file ./drivers/clocksource/mmio.c — the source file for this whole situation. 🫶

🫶 Cute lil sign-off: this page’s source/version is ./drivers/clocksource, and it’s dated October 2026. Byeee, go initialize something simple. 💅✨