Systems and methods for running a legacy 32-bit x86 virtual...

Details Systems and methods for running a legacy 32-bit x86 virtual... Systems and methods for running a legacy 32-bit x86 virtual...

2007-08-21

2007-08-21

Bragdon, Reginald (Department: 2189)

Electrical computers and digital processing systems: memory

Address formation

Address mapping

C711S209000, C712S228000, C712S229000, C718S108000

Reexamination Certificate

active

10883496

ABSTRACT:
The present invention provides a virtualized computing systems and methods for transitioning in real time between LONG SUPER-MODE and LEGACY SUPER-MODE in the x86-64 architecture. In doing so, a virtual machine, which relies on the traditional 32-bit modes, i.e., REAL MODE and PROTECTED MODE (V86 SUB-MODE, RING-0 SUB-MODE, and RING-3 SUB-MODE), is able to run alongside other applications on x86-64 computer hardware (i.e., 64-bit). The method of performing a temporary processor mode context switch includes the steps of the virtual machine monitor's setting up a “virtual=real” page, placing the transition code for performing the processor mode context switch on this page, jumping to this page, disabling the memory management unit (MMU) of the x86-64 computer hardware, modifying the mode control register to set either the LONG SUPER-MODE bit or LEGACY SUPER-MODE bit, loading a new page table, and reactivating the MMU of the x86-64 computer hardware.

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