DEFINE_IDTENTRY_IRQ(9)

DEFINE_IDTENTRY_IRQ(9) 💖✨ — the Kernel API Manual bestie edition

okay so bestie, welcome to the Kernel API Manual! this page is literally about DEFINE_IDTENTRY_IRQ and it's the blueprint for emitting code for device interrupt IDT entry points. no cap, it's giving low-level kernel realness and we're gonna get through it together 🫶

✨ SYNOPSIS ✨

DEFINE_IDTENTRY_IRQ (func );

🎀 ARGUMENTS 🎀

• func — the function name of the entry point. that's it, that's the whole argument bestie 💅

💜 DESCRIPTION 💜

so here's the tea: the vector number gets pushed by the low level entry stub and then handed to the function as the error_code argument. but plot twist — you gotta truncate it to a u8 because the push is sign extending. iykyk, lowkey important 😭

irq_enter/exit_rcu are invoked before the function body, and the KVM L1D flush request is set. stack switching to the interrupt stack has to be done in the function body if necessary. periodt, that's the vibe 🔥

bestie fr fr, do not forget: stack switching is on you if you need it. the macro won't do it for you, and that's just how it is 💀

🌈 SEE ALSO 🌈

• Kernel file ./arch/x86/include/asm/idtentry.h — literally the home of all this magic 🧚
• DECLARE_IDTENTRY(9)
• DEFINE_IDTENTRY(9)
• DECLARE_IDTENTRY_ERRORCODE(9)
• DEFINE_IDTENTRY_ERRORCODE(9)
• DECLARE_IDTENTRY_RAW(9)
• DEFINE_IDTENTRY_RAW(9)
• DEFINE_FREDENTRY_RAW(9)
• DECLARE_IDTENTRY_RAW_ERRORCODE(9)
• DEFINE_IDTENTRY_RAW_ERRORCODE(9)
• DECLARE_IDTENTRY_IRQ(9)
• DECLARE_IDTENTRY_SYSVEC(9)
• DEFINE_IDTENTRY_SYSVEC(9)
• DEFINE_IDTENTRY_SYSVEC_SIMPLE(9)
• DECLARE_IDTENTRY_XENCB(9)
• DECLARE_IDTENTRY_IST(9)
• DECLARE_IDTENTRY_VC(9)
• DEFINE_IDTENTRY_IST(9)
• DEFINE_IDTENTRY_NOIST(9)
• DECLARE_IDTENTRY_DF(9)
• DEFINE_IDTENTRY_DF(9)
• DECLARE_IDTENTRY_DF(9)
• DEFINE_IDTENTRY_DF(9)

big shoutout to ./arch/x86/include/asm for hosting this whole situation, and the version is October 2026. stay iconic, bestie — you're literally main character energy in the kernel now 👑💖✨