memtype_reserve_io(9)

✨ NAME ✨

memtype_reserve_io — okay so this is the kernel API call that requests a memory type mapping for a region of memory 💅

🌸 SYNOPSIS 🌸

int memtype_reserve_io (resource_size_t start , resource_size_t end ,
       enum page_cache_mode *type );

🎀 ARGUMENTS 🎀

• start — the start (physical address) of the region, bestie 📍
• end — the end (physical address) of the region 🏁
• type — a pointer to memtype, carrying the requested type. On success, you get back the requested type or any other compatible type that was available for the region ✨

🦋 DESCRIPTION 🦋

Here’s the whole vibe check: on success, it returns 0 ✅. On failure, it returns non-zero 😭. That’s literally it, no cap.

👑 SEE ALSO 👑

• Kernel file ./arch/x86/mm/pat/memtype.c
• pat_bp_init(9)
• lookup_memtype(9)
• pat_pfn_immune_to_uc_mtrr(9)
• memtype_free_io(9)

kisses and sparkles 🫶 this page’s source/version is ./arch/x86/mm/pat, and it’s dated October 2026 — periodt 💖