memcpy_toio(9)

💅 memcpy_toio — a kernel API manual moment, bestie ✨

okay so picture this: it's giving Kernel API Manual, it's giving memcpy_toio(9), and it's literally the function you call when you need bytes to go into I/O memory. sit down, hydrate, let's get into it 🫶

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🌸 NAME 🌸

memcpy_toio — copy a block of data into I/O memory. that's it. that's the whole vibe. no cap 💖

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✨ SYNOPSIS ✨

void memcpy_toio (volatile void __iomem *dst , const void *src , size_t
count );

look at her. three args, no return value, absolutely unbothered. she's a void girlie and she knows it 🎀

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🦋 ARGUMENTS 🦋

• dst — the destination for the copy, and it's I/O memory, bestie. note the volatile void __iomem * energy — this is not your regular RAM, this is the fancy address space 💅
• src — the source of the data, and this one is RAM. regular degular memory. iconic of it honestly 🌈
• count — the number of bytes to copy. yes, bytes. count them. be precise. slay ⭐

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🔥 DESCRIPTION 🔥

Copy a block of data to I/O memory.

that's the whole description and honestly? she said what she said. no notes. periodt 💀✨

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👑 SEE ALSO 👑

• Kernel file ./lib/iomem_copy.c
• memset_io(9)
• memcpy_fromio(9)

the whole iomem copy friend group!! go say hi to the other two, they're literally right there 🧚💜

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fr fr though: this is the "to I/O" direction. if you wanted data coming out of I/O memory, that's memcpy_fromio(9), and if you're setting instead of copying, that's memset_io(9). iykyk 😭🦋

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and that's the page!! source/version: ./lib, dated October 2026, manual memcpy_toio(9) — mwah, go copy some bytes responsibly, bestie 💖🎀💅