ioremap_wc(9)

💅 NAME 💅

ioremap_wc — map memory into CPU space, write combined ✨

🎀 SYNOPSIS 🎀

void __iomem * ioremap_wc (resource_size_t phys_addr , unsigned long size );

🌸 ARGUMENTS 🌸

• phys_addr — the bus address of the memory, bestie 🫶 that's where we're pointing.
• size — the size of the resource to map, literally how much we're grabbing 💖

🦋 DESCRIPTION 🦋

okay so this version of ioremap makes sure the memory gets marked write combining 💅 and why do we care? because write combining allows faster writes to some hardware devices 🔥 like it's giving speed, it's giving efficiency, we love to see it.

⚠️ no cap though — this memory must be freed with iounmap. don't leave it hanging, that's not the vibe 😭

✨ SEE ALSO ✨

• Kernel file ./arch/x86/mm/ioremap.c 👀 that's where the magic lives
• ioremap(9)
• ioremap_uc(9)
• ioremap_wt(9)
• iounmap(9)

and that's the whole page bestie, xoxo 🎀 this one comes from the source tree over at ./arch/x86/mm, dropped October 2026 — iconic, periodt 💜👑