Protected mode: Unlock the possibilities

u86 systems are always powered upL reset in real mode. But setting bit M (Protected Mode bnable bit) in the control register CoM makes it possible to start operations in the protected mode. HHUH Ls WKH ‘ERXTXHW RI EHnHfiWs’WKDW SURWHFWHG PRGH SURvLGHs: Larger physical address space - Protected mode seamlessly increases the addressable physical address space. cor exampleI a PO-bit x86 system can address up to 64 dB of oAM in the Physical Address Extension (PAE) mode against 4 dB (i.e.I

2 OPO bytes) of oAM without PAb. The PAb feature adds 4 extra bits to a standard PO-bit system (so memory becomes addressable up to OP6 bytes). Modern PO-bit lSs like Linux take advantage of the PAb feature to support full 64 dB of