In Protected Mode x86 architecture, which processor register stores the 32-bit linear base physical address and 16-bit limit size of the Interrupt Descriptor Table (IDT)?
Ch 15: 32-Bit Protected Mode Architecture
Covers transitioning from 16-bit real mode to 32-bit protected mode, setting the PE bit in CR0, constructing 8-byte segment descriptors (base, limit, access rights), and hardware memory protection rings (Ring 0 vs Ring 3).
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CS401 - Computer Architecture and Assembly Language Programming Examination Practice
Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.
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How are interrupts handled in x86 Protected Mode compared to Real Mode?
In x86 Protected Mode segment descriptors, fill in the blanks with the correct descriptor flag bits from the list provided: (A bit, C bit, G bit, D bit, P bit, R bit, B bit).
'In descriptors the 32-bit base is scattered into different places for compatibility reasons. The limit is stored in 20 bits, but the [Blank 1] defines that the limit is in terms of bytes or 4KB pages, therefore a maximum 4GB segment size is possible. The [Blank 2] must be set to signal that this segment is present in memory. DPL is the descriptor privilege level. The [Blank 3] defines whether this segment executes code in 16-bit mode or 32-bit mode. The [Blank 4] is the conforming bit. The [Blank 5] signals that the segment is readable. The [Blank 6] is automatically set whenever the segment is accessed.'
What are the limitations of parameter passing through general-purpose CPU registers, and why is parameter passing through the stack preferred for complex or nested subroutines?
In 8088 assembly language programming, which parameter passing mechanism is execution-wise the fastest, despite its limited scalability?
Why is the Base Pointer (BP) register used instead of the Stack Pointer (SP) to access parameters passed on the stack in 8086/8088 assembly language?
Describe the stack layout upon entry into a Near subroutine when parameters are passed via the stack, and explain the relative BP offsets when 'mov bp, sp' is executed immediately upon entry (without pushing BP).
In 8086/8088 architecture, which segment register is associated by default with the Base Pointer (BP) register during indirect memory addressing?
Why is attempting to retrieve stack parameters using PUSH and POP inside a subroutine inefficient compared to using the Base Pointer (BP) register?
Explain the standard x86 subroutine prologue ('push bp' followed by 'mov bp, sp') and describe how it preserves the caller's frame pointer while shifting stack parameter offsets.