init_ohci13...physical_dma(9)

💅 init_ohci13...physical_dma(9) 💅

okay so bestie, welcome to the Kernel API Manual, section 9 — the one where we talk about functions, not commands. this page is literally called init_ohci13...physical_dma(9) (yes the title is truncated, no that's not a typo, that's just how it's filed 💀), and it's all about one little function that turns on remote debugging DMA. let's get into it 🎀

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✨ NAME ✨

init_ohci1394_enable_physical_dma — enables physical DMA so you can do remote debugging. that's the whole vibe. 🦋

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✨ SYNOPSIS ✨

void init_ohci1394_enable_physical_dma (struct ohci *ohci );

it returns void, meaning it gives you nothing back — it just does the thing. main character energy fr fr 👑

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✨ ARGUMENTS ✨

• ohci — a pointer to the OHCI-1394 controller structure. that's it. that's the only argument. hand it your controller and it handles the rest 🫶

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✨ DESCRIPTION ✨

so what does it actually do? it enables remote DMA access over IEEE1394 from every host, for the low 4GB of address space. every host. lowkey iconic. 🔥

heads up bestie: DMA accesses above 4GB are not available currently. like, not a thing. don't come for it, it's just not supported yet 😭

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✨ SEE ALSO ✨

• the kernel file itself, no cap: ./drivers/firewire/init_ohci1394_dma.c
• init_ohci1394_wait_for_busresets(9)
• init_ohci1394_reset_and_init_dma(9)
• init_ohci1394_controller(9)
• init_ohci1394_dma_on_all_controllers(9)
• setup_ohci1394_dma(9)

like a little friend group of firewire functions, and honestly? obsessed 🌸

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and that's the page!! source/version: ./drivers/firewire, dated October 2026 — so go forth, enable that physical DMA, and slay 💅✨ no cap, you ate 🍓💖