PROJECT FREEDOM

// UEFI application — boots the OS from firmware
#![no_std]
#![no_main]

#[export_name = "efi_main"]
pub extern "efiapi" fn efi_main(
    handle: EfiHandle,
    st: *mut EfiSystemTable,
) -> EfiStatus {
    serial::init();
    // Locate GOP, get memory map, exit Boot Services
    // Switch to 64KB kernel stack via trampoline
    // Enter kernel_stage2() — now bare-metal
}

// Compositor rendering pipeline
pub fn render_frame(
    fb: &mut Framebuffer,
    desktop: &Desktop,
    wm: &WindowManager,
    taskbar: &Taskbar,
    mouse: (i32, i32),
) {
    desktop.draw_background(fb);   // Layer 0
    wm.draw_windows(fb);           // Layer 1
    taskbar.draw(fb);              // Layer 2
    draw_cursor(fb, mouse);        // Layer 3
}

// Graphical login with SHA-256 password hashing
pub fn verify_password(
    input: &[u8],
    stored_hash: &[u8; 32],
) -> bool {
    let hash = crypto_hash::sha256(input);
    // Constant-time comparison
    let mut diff = 0u8;
    for i in 0..32 {
        diff |= hash[i] ^ stored_hash[i];
    }
    diff == 0
}

// 4-level x86_64 page tables
pub fn map_page(
    pml4: &mut PageTable,
    virt: u64,
    phys: u64,
    flags: PageFlags,
) {
    let p4 = (virt >> 39) & 0x1FF;
    let p3 = (virt >> 30) & 0x1FF;
    let p2 = (virt >> 21) & 0x1FF;
    let p1 = (virt >> 12) & 0x1FF;
    // Walk/create PDP → PD → PT entries
}