mpc52xx_get_irq(9)

💅 mpc52xx_get_irq(9) 💅

okay so this page comes from the Kernel API Manual, and the main character is mpc52xx_get_irq(9). let’s get into it 🫶

✨ NAME ✨

mpc52xx_get_irq — Get pending interrupt number hook function

🦋 SYNOPSIS 🦋

unsigned int mpc52xx_get_irq (void );

🎀 ARGUMENTS 🎀

• void — no arguments. literally none, she takes zero input 💀

💅 DESCRIPTION 💅

okay so the interrupt handler calls this function to figure out what IRQ handler needs to be executed. periodt.

To determine the status of pending interrupts, it reads the encoded status register. That register has three fields: one for each of the types of interrupts defined by the controller — 'critical', 'main', and the number associated with the highest priority pending interrupt. The priority order is a whole hierarchy: 'critical' interrupts are highest, then 'main' interrupts, then 'peripheral'. 👑

The mpc5200 interrupt controller can be configured to boost the priority of individual 'peripheral' interrupts. If that’s the case, a special value shows up in either the crit or main fields, and it means a high or medium priority peripheral irq has occurred. 👀

This function checks each of the 3 irq request fields and returns the first pending interrupt that it finds. slay.

It also identifies a 4th type of interrupt: 'bestcomm'. Each bestcomm DMA task can raise the bestcomm peripheral interrupt. When that happens, a task-specific IRQ# is decoded so that each task can have its own IRQ handler. iconic behavior, honestly 💅

🌈 SEE ALSO 🌈

• Kernel file ./arch/powerpc/platforms/52xx/mpc52xx_pic.c
• mpc52xx_is_extirq(9), mpc52xx_irqhost_xlate(9), mpc52xx_irqhost_map(9), mpc52xx_init_irq(9)

that’s the whole vibe, bestie 💖 source/version: ./arch/powerpc/platforms/52xx · date: October 2026 · page: mpc52xx_get_irq(9). bye 🫶