Virtual 8086 - PowerPoint PPT Presentation

VGA System Services

VGA System Services. How to use Linux’s ‘vm86()’ system-call to access the video ROM-BIOS functions. The SVGA firmware. VESA-compliant graphics systems provide built-in service-functions (in adapter ROM) Services normally execute during ‘startup’ before processor enters ‘protected mode’

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Introduction to 8086 emulation

Introduction to 8086 emulation. Using ‘Virtual-8086’ mode to execute real-mode procedures in a protected-mode environment. Features of real-mode. At power-up the Pentium begins executing in real-address mode (memory addressing does not require use of descriptor tables)

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Lect 7: Protected-Mode SW Architecture III

Lect 7: Protected-Mode SW Architecture III. Restricting Control Transfers. Intrasegment Jump and Call limit check Intersegment Jump and Call the operand selects the descriptor of another executable segment (Case 1) the operand selects a call gate descriptor (Case 2) Case 1

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392 views • 24 slides

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