ev_doorbell_send(9)

✨ ev_doorbell_send(9) ✨

okay so bestie, we're diving into the Kernel API Manual today and the star of the show is ev_doorbell_send(9) 🎀 — literally the "ring the doorbell on the other partition" queen. no cap, that's the whole vibe.

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💖 NAME 💖

ev_doorbell_send — send a doorbell to another partition 🛎️✨

like... you're at your partition, your bestie is at their partition, and you just gotta let them know you're there. iconic behavior.

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🦋 SYNOPSIS 🦋

unsigned int ev_doorbell_send (unsigned int handle );

that's it. that's the whole call. one unsigned int in, one unsigned int out. clean, minimal, main character energy 💅

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🌸 ARGUMENTS 🌸

• handle — the doorbell send handle 🫶 that's the little token thingy you pass in so the kernel knows which doorbell you're ringing.

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⭐ DESCRIPTION ⭐

so here's the tea ☕: it returns 0 for success, or an error code. that's literally it, bestie. zero means slay 💅, anything else means something went sideways — the error code will tell you what.

no complicated semantics, no hidden gotchas in this one. you ring the doorbell, you get a number back, you deal with it. periodt. 👑

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🔥 SEE ALSO 🔥

go check out the kernel file ./arch/powerpc/include/asm/epapr_hcalls.h — that's where the actual sauce lives, iykyk 📖✨

and then the whole friend group of related calls, fr fr:

• ev_int_set_config(9)
• ev_int_get_config(9)
• ev_int_set_mask(9)
• ev_int_get_mask(9)
• ev_int_eoi(9)
• ev_byte_channel_send(9)
• ev_byte_channel_receive(9)
• ev_byte_channel_poll(9)
• ev_int_iack(9)
• ev_idle(9)

like literally the entire ePAPR hypercall squad 🌈💜 go read them all, they're all so good.

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💀 reminder: check the return value, bestie. 0 = success, anything else = error code. don't just ignore it and then act surprised. 🙈

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🎀 and that's a wrap, bestie! this page came straight out of ./arch/powerpc/include/asm and it's dated October 2026, filed under ev_doorbell_send(9). mwah 💋 go ring some doorbells 💖✨🦋