arm_smccc_1_2_hvc(9)

💖 arm_smccc_1_2_hvc 💖

okay bestie, so this is a page straight out of the Kernel API Manual (yes, the kernel has lore and it's giving ancient scroll energy) and it's all about arm_smccc_1_2_hvc — making HVC calls, no cap. Buckle up, it's a short one but it ATE. ✨

---

🌸 NAME 🌸

arm_smccc_1_2_hvc — literally just: make HVC calls. that's the whole vibe. 🎀

---

🦋 SYNOPSIS 🦋

void arm_smccc_1_2_hvc (const struct arm_smccc_1_2_regs *args , struct
arm_smccc_1_2_regs *res );

that's the whole signature, bestie — copy it exactly, don't be cute with it. 💅

---

✨ ARGUMENTS ✨

• args — the arguments, passed via struct arm_smccc_1_2_regs. this is the stuff you're sending in 🫶
• res — the result values, coming back at you via struct arm_smccc_1_2_regs. this is the stuff you're getting back 💖

---

🔥 DESCRIPTION 🔥

so what does this function actually do? it's the one you call to make HVC calls following SMC Calling Convention v1.2 or above. iykyk. 👑

here's the tea, step by step (lowkey iconic behaviour):

1. the content of the supplied param (that's your args) are copied from the structure to registers — before the HVC instruction ever runs. like, prepped and ready. ✨
2. then the HVC instruction does its thing.
3. on return from the HVC instruction, the return values are updated with the content from registers — landing right back in your res struct. 🌈

so it's a lil' round trip: struct → registers → HVC → registers → struct. the main character journey, honestly. 💀

ngl this is the v1.2-or-above flavour of the HVC party — the convention version is literally in the description, don't sleep on it. 🧚

---

💜 SEE ALSO 💜

go touch some related grass, bestie, there's a whole friend group here:

• Kernel file ./include/linux/arm-smccc.h
• 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_smc(9)
• struct arm_smccc_quirk(9)
• __arm_smccc_smc(9)
• __arm_smccc_hvc(9)

---

and that's the whole page, periodt. 🎀 comes to you from ./include/linux, dated October 2026, and it's arm_smccc_1_2_hvc(9) forever and always. mwah, go make some HVC calls responsibly 💅💖🌟