Computer emulator
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United States of America Patent
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May 26, 1998
Grant Date -
N/A
app pub date -
Nov 17, 1995
filing date -
Nov 18, 1994
priority date (Note) -
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status (Latency Note)
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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.
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