3 ms·
The microcode hardly needs the segment selector registers. It uses the descriptor cache which includes the base, limit and access rights of the 6 segments + GDT
by bonzini 3y ago
The microcode hardly needs the segment selector registers. It uses the descriptor cache which includes the base, limit and access rights of the 6 segments + GDTR, IDTR, LDTR and TR. The descriptor cache is update by the MOV to segment and L{GDT,IDT,LDT,TR} instructions.