@_cdecl("kmain")
public func kernelMain(_ bootInfo: UInt) {
    // Bootinfo offsets: fb starts at 64, then base(8), baseSize(8), width(8), height(8)
    let fbBase = UnsafePointer<UInt>(bitPattern: bootInfo &+ 64)!.pointee
    let width  = UnsafePointer<UInt64>(bitPattern: bootInfo &+ 80)!.pointee
    let height = UnsafePointer<UInt64>(bitPattern: bootInfo &+ 88)!.pointee

    let pixels = UnsafeMutablePointer<UInt32>(bitPattern: fbBase)!
    let total  = Int(width) &* Int(height)
    let stripe = total / 5

    var i = 0
    while i < total {
        let s = i / stripe
        let color: UInt32
        if s == 0 || s >= 4 { color = 0x5BCEFA }
        else if s == 2      { color = 0xFFFFFF  }
        else                 { color = 0xF5A7B8  }
        pixels[i] = color
        i &+= 1
    }
}