acpi_get_ioapic_id(9)

💖 acpi_get_ioapic_id(9) 💖

okay bestie, welcome to the Kernel API Manual page for acpi_get_ioapic_id — she’s giving low-level ACPI realness and honestly? iconic. 🦋

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🎀 NAME 🎀

acpi_get_ioapic_id — get the IOAPIC ID and physical address matching @gsi_base. slay. ✨

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✨ SYNOPSIS ✨

int acpi_get_ioapic_id (acpi_handle handle , u32 gsi_base , u64 *phys_addr );

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🌸 ARGUMENTS 🌸

• handle — the ACPI object for the IOAPIC device. 🎀
• gsi_base — the GSI base to match with. 🔍
• phys_addr — pointer to store the physical address of the matching IOAPIC record. 💾

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💅 DESCRIPTION 💅

okay so here’s the vibe: acpi_get_ioapic_id() walks the resources returned by the ACPI_MAT method, then the ACPI MADT table, searching for an ACPI IOAPIC record that matches gsi_base. 👑

if it finds a match, it returns the IOAPIC id and stores the physical address in phys_addr. if not, it returns <0. no cap. 😭

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🫶 SEE ALSO 🫶

• Kernel file ./drivers/acpi/processor_core.c — literally the kernel file to peek at. 🌈

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made with 💖 from ./drivers/acpi · October 2026 · acpi_get_ioapic_id(9)