ENUM PCI_INTERRUPT_PIN(9)

💅 enum pci_interrupt_pin(9) — the kernel API manual, bestie edition

okay so this is the manual page for enum pci_interrupt_pin, straight out of the Linux kernel API docs. it's short, it's sweet, and it's literally just "which INTx pin is this" energy. let's go 🎀

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✨ NAME ✨

enum pci_interrupt_pin — PCI INTx interrupt values 💖

like, the whole personality of this enum is "name the legacy interrupt pin". that's it. that's the page. iconic.

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🦋 SYNOPSIS 🦋

enum pci_interrupt_pin {
    PCI_INTERRUPT_UNKNOWN ,
    PCI_INTERRUPT_INTA ,
    PCI_INTERRUPT_INTB ,
    PCI_INTERRUPT_INTC ,
    PCI_INTERRUPT_INTD

};

five values, no cap. notice the trailing space before each comma — that's verbatim, keep it, don't touch it 🙈

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🌸 Constants 🌸

okay here's the whole squad, one by one:

• PCI_INTERRUPT_UNKNOWN — unknown or unassigned interrupt 💀 the "idk her" of interrupt pins
• PCI_INTERRUPT_INTA — PCI INTA pin ✨ the A-lister
• PCI_INTERRUPT_INTB — PCI INTB pin 🦋 the B-side
• PCI_INTERRUPT_INTC — PCI INTC pin ⭐ third wheeling, but make it hardware
• PCI_INTERRUPT_INTD — PCI INTD pin 🍓 the final member of the group chat

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💜 Description 💜

so these values correspond to the values for legacy PCI INTx interrupts, as can be found in the PCI_INTERRUPT_PIN register. that's the register, that's the source of truth, iykyk. 🫶

basically: kernel reads PCI_INTERRUPT_PIN, gets a number, and this enum is how it talks about what it found. no extra lore, no plot twist — the whole description is right there. periodt. 💅

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🔥 SEE ALSO 🔥

the friend group, in full, no one left behind:

• Kernel file ./include/linux/pci.h 📁
• pci_channel_state_t(9)
• pci_is_bridge(9)
• pci_is_vga(9)
• pci_is_display(9)
• struct pci_driver(9)
• PCI_DEVICE(9)
• PCI_DEVICE_DRIVER_OVERRIDE(9)
• PCI_DRIVER_OVERRIDE_DEVICE_VFIO(9)
• PCI_DEVICE_SUB(9)
• PCI_DEVICE_CLASS(9)
• PCI_VDEVICE(9)
• PCI_VDEVICE_SUB(9)
• PCI_DEVICE_DATA(9)
• pcie_capability_clear_and_set_word(9)
• pci_bus_for_each_resource(9)
• module_pci_driver(9)
• builtin_pci_driver(9)
• pci_irq_type(9)
• pci_irqd_intx_xlate(9)
• pci_resource_is_io(9)
• pci_resource_is_mem(9)
• pci_pcie_cap(9)
• pci_is_pcie(9)
• pcie_caps_reg(9)
• pci_pcie_type(9)
• pcie_find_root_port(9)
• pci_vpd_alloc(9)
• pci_vpd_find_id_string(9)
• pci_vpd_find_ro_info_keyword(9)
• pci_vpd_check_csum(9)
• pci_ari_enabled(9)
• pci_is_thunderbolt_attached(9)

ngl that's a lot of PCI. if you're reading this page you probably want at least a few of these. go click around, bestie. 🌈

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and that's the whole page!! sourced from ./include/linux, dated October 2026, footer reading enum pci_interrupt_pin(9) — mwah, sending you off with a 🫶 and a 🎀, go read some registers, ily 💖✨