Macro service processing of interrupt requests in a processing system where a single interrupt is generated for a plurality of completed transactions

A method of processing a processing request issued from a peripheral unit in a central processing unit, comprising the steps of:

• determining whether one of a vector interrupt processing mode and a Macro Service processing mode is set for said processing request;
• reading a Macro Service command and cycle count corresponding to said processing request in a state suspending at least a program counter and program status word without saving the program counter and the program status word, wherein a predetermined number of times of repeated execution for a data transfer process included in one process corresponding to said processing request is stored in the cycle count;
• executing a microprogram corresponding to the read Macro Service command while determining whether said data transfer process has been repeatedly executed for the cycle count;
• and
• ending said process corresponding to the processing request when it is determined that said data transfer process has been repeatedly executed for the cycle count.

A data processing system comprising:

• a central processing unit connected to a memory and a plurality of peripheral units, one of which is for issuing a single peripheral request for one process which includes a data transfer process to be executed a plurality of times;
• interrupt control means for holding mode information indicating whether a currently set mode is a Macro Service processing mode, and for outputting said mode information in response to said peripheral request issued from said one peripheral unit;
• and
• execution means contained in said central processing unit, for executing said one process while determining whether said data transfer process is executed for the plurality of times in a state suspending at least a program counter and program status word without saving the program counter and program status word in a stack, when the mode information indicates the Macro Service processing mode, for decrementing a Macro Service counter corresponding to said peripheral request when said process associated with said peripheral request is ended, for determining whether said Macro Service counter is zero, for awaiting another peripheral request for said one process to re-execute said one process while decrementing said Macro Service counter when it is determined that said Macro Service counter is not zero, for ending said one process when it is determined that said Macro Service counter is zero, and for changing the mode information to indicate another mode.