pci_mmap_legacy_mem(9)

💅 pci_mmap_legacy_mem — Kernel API Manual 💅

okay so bestie, this is the pci_mmap_legacy_mem(9) glow-up from the Kernel API Manual. it's giving kernel-level map magic, and we're gonna read it together ✨

🌸 NAME 🌸

pci_mmap_legacy_mem — map legacy PCI memory into user memory space. literally what it says on the tin, no cap 💖

🎀 SYNOPSIS 🎀

int pci_mmap_legacy_mem (struct file *filp , struct kobject *kobj ,
       const struct bin_attribute *attr , struct vm_area_struct *vma );

🦋 ARGUMENTS 🦋

• filp — open sysfs file. that's the open sysfs file bestie 👑
• kobj — kobject corresponding to device to be mapped. the device's little kernel identity card 🪪
• attr — struct bin_attribute for this file. yes, the bin attribute in question 💅
• vma — struct vm_area_struct passed to mmap. the virtual memory area hanging out with mmap 🫶

✨ DESCRIPTION ✨

so here's the tea: this uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap legacy memory space (the first meg of bus space, iykyk) into application virtual memory space. iconic behavior honestly 💀✨

🌈 SEE ALSO 🌈

Kernel file ./drivers/pci/pci-sysfs.c and these besties:

• pci_read_legacy_io(9)
• pci_write_legacy_io(9)
• pci_mmap_legacy_io(9)
• pci_mmap_resource(9)
• pci_write_rom(9)
• pci_read_rom(9)

and that's the whole vibe, bestie 💖 this page is from the Kernel API Manual, sourced from ./drivers/pci, dated October 2026 — slay and goodbye 🫶🎀