vga_set_legacy_decoding(9)

🎀 NAME 🎀

vga_set_legacy_decoding(9) — okay bestie, this is the Kernel API Manual page for vga_set_legacy_decoding. It's giving "tell the arbiter what's up with legacy decoding," and honestly? Iconic. 💅

✨ SYNOPSIS ✨

       void vga_set_legacy_decoding (struct pci_dev *pdev , unsigned int
       decodes );

🦋 ARGUMENTS 🦋

• pdev — PCI device of the VGA card. That's the card we're talking about, no cap. 🎀
• decodes — bit mask of what legacy regions the card decodes. Like, which legacy regions are getting a yes from this card. 👑

💖 DESCRIPTION 💖

Okay so the whole point is indicating to the arbiter if the card decodes legacy VGA IOs, legacy VGA Memory, both, or none. Literally the legacy-decoding vibe check. ✨

All cards default to both. So the card driver (fbdev for example) should tell the arbiter if it has disabled legacy decoding — that way the card can be left out of the arbitration process, and can be safe to take interrupts at any time. 🫶

🌈 SEE ALSO 🌈

Kernel file ./drivers/pci/vgaarb.c — plus these iconic references: vga_default_device(9), vga_remove_vgacon(9), vga_get(9), vga_tryget(9), vga_put(9), vga_client_register(9). 🧚

Mwah 💋 — the source/version line is ./drivers/pci, dated October 2026. Stay iconic, bestie. 💜