generic_get_free_region(9)

💖 NAME 💖

Okay bestie, welcome to the generic_get_free_region(9) page from the Kernel API Manual ✨ — and its whole NAME moment is literally: generic_get_free_region — Get a free MTRR. Periodt 💅.

✨ SYNOPSIS ✨

int generic_get_free_region (unsigned long base , unsigned long size ,
       int replace_reg );

🎀 ARGUMENTS 🎀

Here’s the little group chat of arguments, no cap:

• base — The starting (base) address of the region 🫶.
• size — The size (in bytes) of the region 📏.
• replace_reg — mtrr index to be replaced; set to invalid value if none 💀.

🌸 RETURN 🌸

On success, you get the index of the region — slay 👑. Otherwise, it returns negative on error 😭.

🦋 SEE ALSO 🦋

Go peek at these besties when you’re done here:

• Kernel file ./arch/x86/kernel/cpu/mtrr/generic.c
• guest_force_mtrr_state(9)
• mtrr_type_lookup(9)
• set_fixed_range(9)
• set_fixed_ranges(9)
• set_mtrr_state(9)
• generic_set_mtrr(9)

xoxo, your kernel bestie 🎀 — source/version vibes from ./arch/x86/kernel/cpu/mtrr, dated October 2026, on the generic_get_free_region(9) page. bye bestie 🫶💜