s10_protected_reg_write(9)

💅 s10_protected_reg_write(9) 💅

ok so this is a page from the Kernel API Manual bestie, and yes the name is a mouthful but we're gonna get through it together 🫶

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✨ NAME ✨

s10_protected_reg_write — literally it, that's the whole name, the original page left the description blank so I'm not gonna make one up for you 💀 (the manpage said nothing, so I say nothing — we respect the source material here)

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🌸 SYNOPSIS 🌸

int s10_protected_reg_write (void *base , unsigned int reg , unsigned
       int val );

three args in, one int out, no cap ✨

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🎀 ARGUMENTS 🎀

• base — the base address of the System Manager. like, the home address of the whole thing 🏠
• reg — the address offset of the register. it's giving "which drawer in the filing cabinet" 🗄️
• val — the value you wanna write. the actual payload, the main character of this whole operation 👑 <br>

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🦋 DESCRIPTION 🦋

so what does it do?? it writes to a protected SMC register. that's the whole vibe. protected, so like… be normal about it 💅🔥

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⭐ RETURN ⭐

here's what you get back, bestie — memorise these:

• INTEL_SIP_SMC_STATUS_OK (0) on success — slay, it worked ✨
• INTEL_SIP_SMC_REG_ERROR on error — it did not work, and the register is telling you so 😭
• INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported — the thing just doesn't know this function, awk 💀

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🌈 SEE ALSO 🌈

go touch some of these next, iykyk:

• Kernel file ./drivers/mfd/altera-sysmgr.c
• struct altr_sysmgr(9)
• s10_protected_reg_read(9) — the read counterpart, the sibling, the duo 🫶
• altr_sysmgr_regmap_lookup_by_phandle(9)

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and that's the whole page diva 🧚💜 this one lives under ./drivers/mfd and it's dated October 2026 — so like, future energy fr fr. go write some protected registers, but responsibly 💖🌸🎀