acpi_os_map_iomem(9)

💖 NAME 💖

acpi_os_map_iomem — get a virtual address for a given physical address range. This is from the Kernel API Manual, and the page is literally acpi_os_map_iomem(9). Slay. 💅

✨ SYNOPSIS ✨

void __iomem __ref * acpi_os_map_iomem (acpi_physical_address phys ,
acpi_size size );

🎀 ARGUMENTS 🎀

• phys — start of the physical address range to map. Like, the beginning of the range, bestie.
• size — size of the physical address range to map. How much of the range we’re grabbing.

🦋 DESCRIPTION 🦋

Okay so here’s the vibe: it looks up the given physical address range in the list of existing ACPI memory mappings. If found, it gets a reference to it and returns a pointer to it — that pointer is its virtual address. If it’s not found, it maps it, adds it to that list, and returns a pointer to it. Iconic behavior, honestly. ✨

During early init — specifically when acpi_permanent_mmap has not been set yet — this routine simply calls __acpi_map_table to get the job done. No cap. 🫶

🌈 SEE ALSO 🌈

• Kernel file ./drivers/acpi/osl.c — plus acpi_os_unmap_iomem(9) and acpi_os_unmap_memory(9). Go read those too, bestie. 💖

Source/version: ./drivers/acpi • Date: October 2026 • Page: acpi_os_map_iomem(9) — bye bestie, go map those ranges responsibly 💅✨