Interrupt management method
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United States of America Patent
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-
Nov 22, 1994
Issued Date -
N/A
app pub date -
Oct 7, 1992
filing date -
Jul 15, 1991
priority date (Note) -
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Abstract
A method of increasing the amount of directly addressable memory address locations that can be allocated to RAM. An initialization routine is executed to identify ROM's in reserved memory address space that are to be reallocated. Suitable address space in extended memory is located and the ROM's are mapped into extended memory address space. A ROM access interceptor routine is implemented to trap ROM accesses and direct them to the reallocated address space. A ROM access handler routine is implemented to contain the ROM execution and to restore the computer system to a condition where it can continue execution of application or system software after the ROM access is completed. Memory addresses in reserved address space formerly allocated to ROM's can be reallocated to RAM or other memory devices.
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