uv_mmtimer_ioctl(9)

🌸 uv_mmtimer_ioctl(9) 🌸

okay bestie, welcome to the Kernel API Manual — this is the page for uv_mmtimer_ioctl, literally the ioctl interface for /dev/uv_mmtimer ✨

💅 SYNOPSIS 💅

long uv_mmtimer_ioctl (struct file *file , unsigned int cmd , unsigned long arg );

🫶 ARGUMENTS 🫶

• file — the file structure for the device, bestie 🎀
• cmd — the command to execute, no cap
• arg — optional argument to the command

🌈 DESCRIPTION 🌈

So this function executes the command specified by cmd. It returns 0 for success and < 0 for failure — slay 💅

Valid commands are giving iconic:

• MMTIMER_GETOFFSET — Should return the offset (relative to the start of the page where the registers are mapped) for the counter in question 🧚
• MMTIMER_GETRES — Returns the resolution of the clock in femto (10^-15) seconds ⭐
• MMTIMER_GETFREQ — Copies the frequency of the clock in Hz to the address specified by arg 🔥
• MMTIMER_GETBITS — Returns the number of bits in the clock's counter 💜
• MMTIMER_MMAPAVAIL — Returns 1 if registers can be mmap'd into userspace 🦋
• MMTIMER_GETCOUNTER — Gets the current value in the counter and places it in the address specified by arg 🎀

👑 SEE ALSO 👑

Kernel file ./drivers/char/uv_mmtimer.c uv_mmtimer_mmap(9), uv_mmtimer_init(9) — go read those too, iykyk 🌸

xoxo, signed off by the Kernel API Manual besties — source/version line: ./drivers/char; date: October 2026 🎀✨💖