초록 ▼

A data processing system includes a microprocessor, memory, and an instruction substitution filter. The microprocessor has separate data and instruction caches. The filter includes configuration memory that occupies memory mapped I/O space. Configuration data indicating instruction types to be deimp

A data processing system includes a microprocessor, memory, and an instruction substitution filter. The microprocessor has separate data and instruction caches. The filter includes configuration memory that occupies memory mapped I/O space. Configuration data indicating instruction types to be deimplemented is entered into the filter during a boot sequence. Once configured, the filter substitutes call instructions for the deimplemented instructions. When executed, the call instructions activate a substitution routine that determines the address of the deimplemented instruction and then performs a data read of the unfiltered deimplemented instructions and then implements the function that the deimplemented function was intended to implement (but, due to microprocessor defects, does not). Accordingly, the present invention allows a microprocessor with defectively implemented instructions to be used as intended with minimal performance penalties.

대표청구항 ▼

[ What is claimed is:] [7.] A method of deimplementing a subject instruction implemented on a data processor, said method comprising the steps of:entering configuration data into an instruction filter so as to configure it to substitute a call instruction for said subject instruction, andstoring a s

[ What is claimed is:] [7.] A method of deimplementing a subject instruction implemented on a data processor, said method comprising the steps of:entering configuration data into an instruction filter so as to configure it to substitute a call instruction for said subject instruction, andstoring a substitution routine at a memory address addressed by said call instruction;monitoring for deimplemented instructions, while running a subject program including said subject instruction to be deimplemented;substituting said call instruction for said subject instruction when said subject instruction is received by said instruction filter;running said substitution routine;resuming said subject program and said monitoring.