Computer emulator

Details Computer emulator Computer emulator

1995-11-17

1998-05-26

Louis-Jacques, Jacques H.

Boots, shoes, and leggings

395527, 39542103, 364DIG1, 3642323, 364DIG2, 36492781, 3649555, G06F 9455

Patent

active

057581240

ABSTRACT:
What is disclosed is an emulator that emulates on an execution machine the operation of a target machine. The emulator emulates routines that are called via a jump table such as the BIOS. Control is transferred to an emulation module not by directly trapping the procedure to call the BIOS but by placing a privileged instruction (a halt instruction, for example) in the area called and by causing a trap through the execution of the privileged instruction. An identifier is placed after the halt instruction and a needed BIOS emulation module is called by a dispatcher using this identifier. Therefore, normal operation can be obtained even if there is a resident program which rewrites the jump table.

REFERENCES:
patent: 5062042 (1991-10-01), Binkley et al.
patent: 5481684 (1996-01-01), Richter et al.
patent: 5497494 (1996-03-01), Combs et al.l
patent: 5504922 (1996-04-01), Seki et al.
patent: 5548763 (1996-08-01), Combs et al.
patent: 5551043 (1996-08-01), Crump et al.
patent: 5577220 (1996-11-01), Combs et al.

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