STRUCT X86_LEGACY_FEATURES(9)

✨ struct x86_legacy_features(9) ✨

okay bestie, welcome to the Kernel API Manual entry for struct x86_legacy_features — it's literally the whole personality file for legacy x86 features 🎀 iykyk

---

💜 NAME 💜

struct x86_legacy_features — legacy x86 features, that's the whole vibe 🦋

---

🌸 SYNOPSIS 🌸

struct x86_legacy_features {
    enum x86_legacy_i8042_state i8042;
    int rtc;
    int warm_reset;
    int no_vga;
    int reserve_bios_regions;
    struct x86_legacy_devices devices;
 };

no cap, that's the exact struct 💅

---

🫶 Members 🫶

• i8042 — tells you if we should expect this device to have an i8042 controller present. it's giving "is the keyboard controller in the room with us" energy 😭
• rtc — this device has a CMOS real-time clock present ⭐
• warm_reset — 1 if the platform allows warm reset, else 0. simple as that, fr fr
• no_vga — 1 if (FADT.boot_flags & ACPI_FADT_NO_VGA) is set, else 0. that's the literal expression, don't come for me 🔥
• reserve_bios_regions — boot code will search for the EBDA address and the start of the 640k - 1M BIOS region. if false, the platform must ensure that its memory map correctly reserves sub-1MB regions as needed. lowkey important — don't skip this one bestie 🙈
• devices — legacy x86 devices. refer to struct x86_legacy_devices documentation for further details 👑

---

🦋 SEE ALSO 🦋

Kernel file ./arch/x86/include/asm/x86_init.h plus all these iconic siblings:

• struct x86_init_mpparse(9)
• struct x86_init_resources(9)
• struct x86_init_irqs(9)
• struct x86_init_oem(9)
• struct x86_init_paging(9)
• struct x86_init_timers(9)
• struct x86_init_iommu(9)
• struct x86_init_pci(9)
• struct x86_hyper_init(9)
• struct x86_init_acpi(9)
• struct x86_guest(9)
• struct x86_init_ops(9)
• struct x86_cpuinit_ops(9)
• struct x86_legacy_devices(9)
• enum x86_legacy_i8042_state(9)
• struct x86_hyper_runtime(9)
• struct x86_platform_ops(9)

---

go read struct x86_legacy_devices(9) too, bestie — the devices member is literally pointing you there 🧚

---

and that's the page!! mwah 💖 this one lives in ./arch/x86/include/asm in the Kernel API Manual, dated October 2026, and the header is literally struct x86_legacy_features(9) — slay, go touch some registers 🌈👑