In some ways, Windows already does that too - the 32-bit syscall wrappers [switch into a 64-bit code segment](https://aktas.github.io/Heavens-Gate https://aktas

In some ways, Windows already does that too - the 32-bit syscall wrappers [switch into a 64-bit code segment](https://aktas.github.io/Heavens-Gate https://aktas.github.io/Heavens-Gate) so the 64-bit ntdll copy can call the 64-bit syscall.