__arm_smccc_smc(9)

✨ NAME ✨

okay so bestie, welcome to __arm_smccc_smc(9) from the Kernel API Manual 🫶💖. The whole name-vibe is: __arm_smccc_smc — make SMC calls @a0-a7: arguments passed in registers 0 to 7 ✨.

🫶 SYNOPSIS 🫶

Here's the signature exactly as it is, no cap:

void __arm_smccc_smc (unsigned long a0 , unsigned long a1 , unsigned long a2 , unsigned long a3 , unsigned long a4 , unsigned long a5 , unsigned long a6 , unsigned long a7 , struct arm_smccc_res *res , struct arm_smccc_quirk *quirk );

🎀 ARGUMENTS 🎀

• a0 — the original is literally giving -- undescribed --, so that's all we know 😭
• a1 — same energy, bestie: -- undescribed -- 🫠
• a2 — the docs said -- undescribed -- and honestly they meant it 💀
• a3 — yup, -- undescribed -- again 🌸
• a4 — -- undescribed --, no extra lore, fr fr 🙈
• a5 — -- undescribed --, that's the whole tea 🍓
• a6 — -- undescribed --, the mystery continues 🧚
• a7 — -- undescribed --, we stay guessing 💜
• res — result values from registers 0 to 3 ✨
• quirk — points to an arm_smccc_quirk, or NULL when no quirks are required 🫶

💅 DESCRIPTION 💅

okay so this function is used to make SMC calls following the SMC Calling Convention ✨. The content of the supplied param gets copied to registers 0 to 7 before the SMC instruction does its thing 💅. On the way back from the SMC instruction, the return values are updated with the content from register 0 to 3 🫶. And the optional quirk structure? It provides vendor specific behavior, periodt 🌈.

🔥 SEE ALSO 🔥

Kernel file ./include/linux/arm-smccc.h is where the header lore lives 📁✨.

• arm_smccc_1_1_get_conduit(9)
• arm_smccc_get_version(9)
• arm_smccc_get_soc_id_version(9)
• arm_smccc_get_soc_id_revision(9)
• struct arm_smccc_res(9)
• struct arm_smccc_1_2_regs(9)
• arm_smccc_1_2_hvc(9)
• arm_smccc_1_2_smc(9)
• struct arm_smccc_quirk(9)
• __arm_smccc_hvc(9)

okay bye bestie 🫶 this page's source/version is ./include/linux, it's dated October 2026, and the manual page is __arm_smccc_smc(9) — you ate that, fr fr 💅✨