__ioread64_copy(9)

💅 __ioread64_copy(9) 💅

okay so bestie, this is the Kernel API Manual page for __ioread64_copy(9) — yes, the title is literally the function name, and the manual name is Kernel API Manual. we're so back. ✨

🌸 NAME 🌸

__ioread64_copy — copy data from MMIO space, in 64-bit units. no cap, that's the whole name. 💖

✨ SYNOPSIS ✨

void __ioread64_copy (void *to , const void __iomem *from , size_t count
);

🎀 ARGUMENTS 🎀

• to — the destination, and it must be 64-bit aligned 💅
• from — the source, in MMIO space, and it also must be 64-bit aligned ✨
• count — number of 64-bit quantities to copy. periodt. 🫶

🦋 DESCRIPTION 🦋

okay so what it does: it copies data from MMIO space to kernel space, in units of 32 or 64 bits at a time. literally that's the move. 💫

⚠️ bestie, important: the order of access is not guaranteed, and a memory barrier is not performed afterwards. fr fr, don't assume either one. 😭

🔥 SEE ALSO 🔥

• Kernel file ./arch/mips/lib/iomap_copy.c — go read it, iykyk. 👑

mwah 💋 this iconic little page comes from ./arch/mips/lib and is dated October 2026. slay and goodbye bestie! 🎀🌈