Hvad er Current Protection Level (CPL)?

Hmm, jeg fandt ud af det selv:

unsigned int GetCPL()
{
    //    Taken from Chapter 4.2 in IA-32 Intel Architecture Software Deleloper's Manual Volume 3A - System Programming Guide, Part 1
    //
    //    Current privilege level (CPL) field — (Bits 0 and 1 of the CS segment register.) Indicates
    //    the privilege level of the currently executing program or procedure. The term current
    //    privilege level (CPL) refers to the setting of this field.
    //
    unsigned int cpl;
    __asm
    {
        mov ax, cs
        and eax, 0x00000003
        mov cpl, eax
    }

    return cpl;
}

unsigned int GetCPL()
{
    __asm
    {
        mov ax, cs
        and eax, 0x00000003
    }
}

cdecl returnerer jo alligevel resultatet i eax ;)