mfhi_func(9)

💫 mfhi_func(9) — like, the MFHI emulation era 💫

okay bestie, so this is a page from the Kernel API Manual and it's about mfhi_func, and honestly? it's the shortest little icon in the MIPS emulation friend group. she does One Job and she does it flawlessly. we love a low-maintenance queen 👑

---

✨ NAME ✨

mfhi_func — literally just: Emulate a MFHI instruction. that's it. that's the whole vibe. 🎀

---

🌸 SYNOPSIS 🌸

int mfhi_func (struct pt_regs *regs , u32 ir );

yes the spaces before those commas are exactly how they're written, do not come for her formatting, she's been like this since October 2026 💅

---

🦋 ARGUMENTS 🦋

• regs — the process register set. yep, the whole lil register squad, handed over so she can do her thing 🫶
• ir — the instruction. the actual MFHI-ness that needs emulating ✨

---

💖 DESCRIPTION 💖

Returns 0, because it always succeeds. no branches, no drama, no "well it depends", no -EINVAL jump scare. she said success and she meant it. main character energy fr fr 🔥

ngl this is the most unbothered function in ./arch/mips/kernel/mips-r2-to-r6-emul.c and i'm obsessed 😭

---

🌈 SEE ALSO 🌈

the whole friend group!! go say hi to all of them 💜

• Kernel file ./arch/mips/kernel/mips-r2-to-r6-emul.c
• mipsr6_emul(9)
• movf_func(9)
• movt_func(9)
• jr_func(9)
• movz_func(9)
• movn_func(9)
• mthi_func(9)
• mflo_func(9)
• mtlo_func(9)
• mult_func(9)
• multu_func(9)
• div_func(9)
• divu_func(9)
• dmult_func(9)
• dmultu_func(9)
• ddiv_func(9)
• ddivu_func(9)
• madd_func(9)
• maddu_func(9)
• msub_func(9)
• msubu_func(9)
• mul_func(9)
• clz_func(9)
• clo_func(9)
• dclz_func(9)
• dclo_func(9)
• mipsr2_decoder(9)

like, a full roster. a whole ensemble cast. mfhi_func is just happy to be there 💀

---

kay that's the page!! this lil gem lives under ./arch/mips/kernel, dated October 2026, and it's part of the mfhi_func(9) manual — go read the whole squad, they're all this cute 🧚‍♀️💖