iosys_map_memcpy_to(9)

💅 iosys_map_memcpy_to(9) 💅

Okay bestie, welcome to the Kernel API Manual — yes, that's the manual name, we're in kernel-land now 🐧✨ This one's a little C helper, and honestly it's giving "small but mighty." Let's get into it 🫶

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✨ NAME ✨

iosys_map_memcpy_to — memcpy into an offset of an iosys_map, no cap 💖

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🌸 SYNOPSIS 🌸

void iosys_map_memcpy_to (struct iosys_map *dst , size_t dst_offset ,
       const void *src , size_t len );

Literally the whole signature, character for character, because we do not mess with code around here 🔥

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🎀 ARGUMENTS 🎀

• dst — the iosys_map structure itself, the main character of this whole operation 👑
• dst_offset — the offset from which to copy, i.e. where in dst the writing action starts 📍
• src — the source buffer, aka where the data is coming from 🍓
• len — the number of bytes in src, like, how much of the vibe we're transferring 💫

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🦋 DESCRIPTION 🦋

So what does it actually do? It copies data into an iosys_map, and it does it with an offset. The source buffer lives in system memory, bestie 🧠✨

And here's the cute part: depending on where the buffer's location is, the helper picks the correct method of accessing the memory. Like it just knows 💅 The helper ate and left no crumbs.

Ngl, the whole point is that you don't have to think about how the memory is accessed — the helper handles the vibe check for you 🌈

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⭐ SEE ALSO ⭐

The whole friend group, assembled 🫶 iykyk:

• Kernel file ./include/linux/iosys-map.h overview(9)
• struct iosys_map(9)
• IOSYS_MAP_INIT_VADDR(9)
• IOSYS_MAP_INIT_VADDR_IOMEM(9)
• IOSYS_MAP_INIT_OFFSET(9)
• iosys_map_set_vaddr(9)
• iosys_map_set_vaddr_iomem(9)
• iosys_map_is_equal(9)
• iosys_map_is_null(9)
• iosys_map_is_set(9)
• iosys_map_clear(9)
• iosys_map_memcpy_from(9)
• iosys_map_incr(9)
• iosys_map_memset(9)
• iosys_map_rd(9)
• iosys_map_wr(9)
• iosys_map_rd_field(9)
• iosys_map_wr_field(9)

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Okay that's the whole page, mwah 💋 This little number lives in ./include/linux, dated October 2026, and it's filed under iosys_map_memcpy_to(9) — go forth and memcpy responsibly, bestie 🧚‍♀️💜