pci_map_rom(9)

📦 version 7.3.1, in nixpkgs unstable

💖 NAME 💖

Okay bestie, this is pci_map_rom from the Kernel API Manual, and its whole serve is mapping a PCI ROM to kernel space. Periodt. ✨

🌸 SYNOPSIS 🌸

The signature is giving low-level but iconic:

void __iomem * pci_map_rom (struct pci_dev *pdev , size_t *size );

🎀 ARGUMENTS 🎀

  • pdev — pointer to pci device struct. Like, hand over the PCI device struct pointer and we’re cooking. 🫶
  • size — pointer to receive size of pci window over ROM. It’s the “hey, put the size here” bestie of the operation. 💅

💫 RETURN 💫

It returns a kernel virtual pointer to image of ROM. That’s the whole return vibe, no cap. 🌟

🦋 DESCRIPTION 🦋

This maps a PCI ROM into kernel space. Important caveat: if the ROM is the boot video ROM, the shadow BIOS copy will be returned instead of the actual ROM. So you’re not getting the actual ROM in that case — you’re getting the shadow BIOS copy. Noted, bestie. 📝💖

🔥 SEE ALSO 🔥

The kernel file ./drivers/pci/rom.c plus these function besties:

iykyk — they’re all in the ROM lore. 🧚✨

sign-off tea: source/version is ./drivers/pci, date is October 2026, and this page is pci_map_rom(9). 💜🎀

📦 where this page comes from