System and method for securely utilizing basic input and output system (BIOS) services (US6148387)


	Parent Case:			RELATED APPLICATION This application is a Continuation-In-Part of U.S. patent application Ser. No. 08/947,990 filed on Oct. 9, 1997, now abandoned.
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	First Claim: Show all 26 claims			What is claimed is: 1. A system for accessing and executing instruction sequences in a physical memory from a virtual memory in a processor-based system, comprising: a memory for storing instruction sequences by which the processor-based system is processed, the memory including a physical memory and a virtual memory; and a processor for executing the stored instruction sequences; and wherein the stored instruction sequences cause the processor to: (a) map a plurality of BIOS instruction sequences from the physical memory to the virtual memory, said BIOS instruction sequences including a BIOS service directory; and map BIOS data from the physical memory to the virtual memory; (b) determine a starting virtual address of the BIOS service directory; and determine a starting virtual address of one of the plurality of BIOS instruction sequences by reference to the BIOS service directory; (c) receive an instruction to execute the one of said plurality of predetermined instruction sequences; (d) transfer control to the one of said plurality of predetermined instruction sequences; and (e) process the one of said plurality of predetermined instruction sequences from the virtual memory.
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	Forward References:			Show 46 U.S. patent(s) that reference this one

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