BUFFER CONTROLLER, METHOD AND DEVICE FOR BUFFER EVALUATION, RECORDING MEDIUM WHERE PROGRAM IS RECORDED, CENTRAL PROCESSOR, AND INFORMATION PROCESSOR

PROBLEM TO BE SOLVED: To intentionally place a buffer state detecting means and a buffer state notification means in operation and to make it easy to evaluate functions on a processor side which can not normally operate by replacing the state value of a buffer with a value for evaluation according to the analysis result of an evaluation code stored in a buffer. SOLUTION: A service processor 2 sets the evaluation code for a central processor 1. An evaluation code appending means 121 appends the set evaluation code to a request to be sent to a buffer controller 13 through a signal line 101. Then a buffer state detecting means 136 detects the state of a buffer 131 from the contents reported through a signal line 102. The buffer state notification means 137 informs a processor 11 of the state of the buffer 131 through a signal line 104. An evaluation code analyzing means 138 analyzes the evaluation code and a buffer value replacing means 139 replaces the value sent to the buffer state detecting means 136 with the value for evaluation according to the contents of analysis of the evaluation code.