pub fn readCr2() u64 {
    return asm volatile (
        \\ mov %cr2, %rax
        : [ret] "={rax}" (-> u64),
        :
        : .{});
}

pub fn readCr3() u64 {
    return asm volatile (
        \\ mov %cr3, %rax
        : [ret] "={rax}" (-> u64),
        :
        : .{});
}

pub const PrivilegeLevel = enum(u4) {
    Kernel = 0,
    User = 3,
};

pub const PtRegs = struct {
    r15: usize,
    r14: usize,
    r13: usize,
    r12: usize,
    bp: usize,
    bx: usize,
    r11: usize,
    r10: usize,
    r9: usize,
    r8: usize,
    ax: usize,
    cx: usize,
    dx: usize,
    si: usize,
    di: usize,
    code: usize,
    ip: usize,
    cs: usize,
    flags: usize,
    sp: usize,
    ss: usize,
};