System and method for simulating real-mode memory access...

Details System and method for simulating real-mode memory access... System and method for simulating real-mode memory access...

2004-06-30

2008-05-27

Elmore, Reba I. (Department: 2189)

Electrical computers and digital processing systems: memory

Address formation

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C711S002000, C711S207000

Reexamination Certificate

active

07380095

ABSTRACT:
In some embodiments, the invention involves a system and method relating to switching to protected mode to access extended memory while executing instruction code that is designed for real mode memory access. In at least one embodiment, the present invention is intended to enable complex option-ROM code to be executed during pre-boot without corrupting system memory used by the BIOS or other option-ROMs. Other embodiments are described and claimed.

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European Patent Office, International Search Report and Written Opinion for International Application No. PCT/US2005/021113, 16 pages, Nov. 4, 2005.
Jean Gareau, “Embedded x86 Programming: Protected Mode,” Embedded Systems Programming, Apr. 1998, pp. 80-93.
Intel Corporation, “Intel Architecture Software Developer's Manual—vol. 3: System Programming Guide,” pp. 2-1 to 2-7 (sections 2.1 to 2.2), pp. 3-15 to 3-17 (section 3.5.1), p. 4-6 (section 4.4.1), pp. 5-9 to 5-19 (sections 5.8 to 5.12), pp. 5-38, pp. 8-9 to 8-16 (sections 8.6 to 8.9), and pp. 15-1 to 15-8 (section 15.1), 1997.

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