smccc_hvc(9)

okay so you're on the smccc_hvc(9) page in the Kernel API Manual, and it's giving kernel bestie energy 💖✨. The whole vibe? smccc_hvc invokes a SMCCC function using the hvc conduit. No cap. 🫶

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🌸 NAME 🌸

smccc_hvc — invoke a SMCCC function using the hvc conduit. periodt. 💅

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🦋 SYNOPSIS 🦋

Here's the whole signature, bestie — copy it exactly, don't come for me:

void smccc_hvc (u32 function_id , u64 arg0 , u64 arg1 , u64 arg2 , u64
arg3 , u64 arg4 , u64 arg5 , u64 arg6 , struct arm_smccc_res *res );

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🎀 ARGUMENTS 🎀

okay so the arguments are literally right here, and yes we're keeping every single one:

• function_id — the SMCCC function to be called. arg0-arg6 are the SMCCC function arguments, corresponding to registers x1-x7.
• arg0 — -- undescribed --
• arg1 — -- undescribed --
• arg2 — -- undescribed --
• arg3 — -- undescribed --
• arg4 — -- undescribed --
• arg5 — -- undescribed --
• arg6 — -- undescribed --
• res — pointer to write the return values from registers x0-x3.

not me listing every arg even when they're all -- undescribed -- 😭 but the page said it, so we're saying it. 🫶

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🌈 SEE ALSO 🌈

go peek at these too, iykyk:

• Kernel file ./tools/testing/selftests/kvm/include/arm64/processor.h
• struct arm_smccc_res(9)
• smccc_smc(9)

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and that's the whole vibe check 💅✨. This page's source/version is ./tools/testing/selftests/kvm/... and smccc_hvc(9), dated October 2026 — mwah, slay, bye bestie 🫶💜