__riscv_isa...on_available(9)

✨ __riscv_isa...on_available(9) ✨

okay so bestie, this is a page straight out of the Kernel API Manual and it's literally the vibe check for RISC-V CPU extensions 💅 like, "does this chip have this feature or not" energy. Let's get into it 🫶

🌸 NAME 🌸

__riscv_isa_extension_available — checks whether a given extension is available or not 🦋

⭐ SYNOPSIS ⭐

bool __riscv_isa_extension_available (const unsigned long *isa_bitmap ,
unsigned int bit );

🎀 ARGUMENTS 🎀

• isa_bitmap — the ISA bitmap you wanna use, like the actual lookup table of extensions 💖
• bit — the bit position of the extension you're curious about 👀

🔥 RETURN 🔥

true or false. that's it, that's the whole answer, no cap ✨

💀 NOTE 💀

If isa_bitmap is NULL then the Host ISA bitmap will be used. so like, no bitmap? no problem, it just falls back to the host's own 🧚

🌈 SEE ALSO 🌈

• Kernel file ./arch/riscv/kernel/cpufeature.c
• riscv_isa_extension_base(9)

and that's the whole page, bestie 🍓 sign-off time: this lil piece lives in ./arch/riscv/kernel, dated October 2026, and it's giving iconic kernel docs energy 👑 mwah 💜