What is access right byte?
This byte describes how the segment functions in the system. The access rights byte allows complete control over the segment. If the segment is a data segment, the direction of growth is specified. If the segment grows beyond its limit, the microprocessor’s program is interrupted, indicating a general protection fault.Click to see full answer. Similarly,…
This byte describes how the segment functions in the system. The access rights byte allows complete control over the segment. If the segment is a data segment, the direction of growth is specified. If the segment grows beyond its limit, the microprocessor’s program is interrupted, indicating a general protection fault.Click to see full answer. Similarly, what is GDT and LDT?Global Descriptor Table. While the LDT contains memory segments which are private to a specific program, the GDT contains global segments. The x86 processors have facilities for automatically switching the current LDT on specific machine events, but no facilities for automatically switching the GDT.Secondly, what is a descriptor in 80386? Descriptors: The 80386 descriptors have a 20-bit segment limit and 32-bit segment address. The descriptor of 80386 are 8-byte quantities access right or attribute bits along with the base and limit of the segments. If D=1, the segment is a 32-bit operand segment, else, it is a 16-bit operand segment. Also, what is selector and descriptor? Selectors and descriptors. Descriptors are a bit like real mode segments; they describe (as the name implies) a memory area in protected mode. A descriptor contains information about segment length, its base address and the attributes of it (i.e. type, access rights, ).What is the range of addressable memory in protected mode?The range of addressable memory in protected mode is Gbyte 0 to FFFFFFFFh. The protected mode is among the most powerful mode. In this the program is restricted to addressing a specific contiguous area of 640 Kb. It allows using features like virtual memory, paging and safe multitasking.
