mmu_reg_store(9)

💖 mmu_reg_store — the Kernel API Manual page where we write to a control register of MMU[ID] 💖

okay so bestie, picture this: it's mmu_reg_store, straight out of the Kernel API Manual, and it is literally the tiniest little function ever — but she does something real. She reaches into an MMU's control register and she writes to it. That's the whole vibe. No cap.

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✨ SYNOPSIS ✨

void mmu_reg_store (const mmu_ID_t ID , const unsigned int reg , const
hrt_data value );

that's it. that's the signature. she's void, she takes three args, and she's not giving you anything back 🎀. (well. except for the register getting written. we'll get there. iykyk.)

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🦋 ARGUMENTS 🦋

three of them. all three are kind of important. like, do not skip any of these.

• ID — the MMU identifier. which MMU are we talking to?? this is the who. main character selection energy.
• reg — the register index. this is the where. which slot inside that MMU's control register array are we aiming at 🎯.
• value — the data to be written. this is the what. the actual payload. the whole reason we showed up 💅.

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🌸 RETURN 🌸

none. nothing. zero. nada. she returns nothing 🫶

but — and this is the important part — the side effect is:

MMU[ID].ctrl[reg] = value

so like. the function gives you nothing back, but the world has changed. that's called range, bestie 💜. she's doing it for the plot, not for the credit.

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⭐ SEE ALSO ⭐

• Kernel file — ./drivers/staging/media/atomisp/pci/hive_isp_css_include/host/mmu_public.h (yes the path is long. no i will not be shortening it. she said what she said 🧚)
• mmu_set_page_table_base_index(9)
• mmu_get_page_table_base_index(9)
• mmu_invalidate_cache(9)
• mmu_invalidate_cache_all(9)
• mmu_reg_load(9) — the read to her write. iconic pairing, honestly 👑

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💀 quick vibe check: this whole page lives under ./drivers/staging/media/atomis... — so she's real, she's in the tree, she's part of the atomisp hive. go read the header if you want the full lore 🙈

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and that's the page, bestie!! sign-off time: this little beauty comes to you via ./drivers/staging/media/atomis..., dated October 2026, and yes she is still filed under mmu_reg_store(9) because legends never change their section number 😭💖🌷✨