Systems and methods for effecting DMA data transfers

An information processing method of direct memory access (DMA) transferring information between a first storage section in an information processing system and a second storage section in an information transfer system, the method comprising the steps of:

• generating descriptor information that indicates a location at which the information is stored in the first storage section and a size of the information;
• storing the generated descriptor information in the second storage section in the information transfer system;
• DMA transferring the information between the first storage section and the second storage section based on the descriptor information stored in the second storage section;
• DMA transferring the descriptor information concerning the DMA transferred information from the second storage section to the first storage section;
• and
• loading the DMA transferred descriptor information from the first storage section, wherein
• when the DMA transfer of the information has been completed, the DMA transfer section DMA transfers descriptor information indicating completion of the DMA transfer of the information from the second storage section in the information transfer system to the first storage section in the information processing system, and
• the control section loads the descriptor information indicating the completion of the DMA transfer from the first storage section, and further wherein an I/O interface of the information processing system is connected to a network via a transmission section having a register, DMA transfer section, temporary storage and an interrupt generation section.

A program for causing a computer to execute an information processing method to direct memory access (DMA) transfer information between a first storage section in an information processing system and a second storage section in an information transfer system, the method including the steps of:

• generating descriptor information that indicates a location at which the information is stored in the first storage section and a size of the information;
• storing the generated descriptor information in the second storage section in the information transfer system;
• DMA transferring the information between the first storage section and the second storage section based on the descriptor information stored in the second storage section;
• DMA transferring the descriptor information concerning the DMA transferred information from the second storage section to the first storage section;
• and
• loading the DMA transferred descriptor information from the first storage section, wherein
• when the DMA transfer of the information has been completed, the DMA transfer section DMA transfers descriptor information indicating completion of the DMA transfer of the information from the second storage section in the information transfer system to the first storage section in the information processing system, and
• the control section loads the descriptor information indicating the completion of the DMA transfer from the first storage section, and further wherein an I/O interface of the information processing system is connected to a network via a transmission section having a register, DMA transfer section, temporary storage and an interrupt generation section.

A computer-readable storage medium that has stored therein a program for causing a computer to execute an information processing method to direct memory access (DMA) transfer information between a first storage section in an information processing system and a second storage section in an information transfer system, the method including the steps of:

• generating descriptor information that indicates a location at which the information is stored in the first storage section and a size of the information;
• storing the generated descriptor information in the second storage section in the information transfer system;
• DMA transferring the information between the first storage section and the second storage section based on the descriptor information stored in the second storage section;
• DMA transferring the descriptor information concerning the DMA transferred information from the second storage section to the first storage section;
• and
• loading the DMA transferred descriptor information from the first storage section, wherein
• when the DMA transfer of the information has been completed, the DMA transfer section DMA transfers descriptor information indicating completion of the DMA transfer of the information from the second storage section in the information transfer system to the first storage section in the information processing system, and
• the control section loads the descriptor information indicating the completion of the DMA transfer from the first storage section, and further wherein an I/O interface of the information processing system is connected to a network via a transmission section having a register, DMA transfer section, temporary storage and an interrupt generation section.

A direct memory access (DMA) controller for DMA transferring information between a first storage section in an information processing system and a second storage section in an information transfer system, the DMA controller comprising:

• said second storage section configured to store descriptor information that indicates a location at which the information is stored in the first storage section and a size of the information;
• and
• a DMA transfer section configured to DMA transfer the information between the first storage section and said second storage section based on the descriptor information stored in said second storage section, wherein
• said DMA transfer section DMA transfers the descriptor information concerning the DMA transferred information from said second storage section to the first storage section, wherein
• when the DMA transfer of the information has been completed, the DMA transfer section DMA transfers descriptor information indicating completion of the DMA transfer of the information from the second storage section in the information transfer system to the first storage section in the information processing system, and
• the control section loads the descriptor information indicating the completion of the DMA transfer from the first storage section, and further wherein an I/O interface of the information processing system is connected to a network via a transmission section having a register, DMA transfer section, temporary storage and an interrupt generation section.

A direct memory access (DMA) transfer method of DMA transferring information between a first storage section in an information processing system and a second storage section in an information transfer system, the method comprising the steps of:

• generating descriptor information that indicates a location at which the information is stored in the first storage section and a size of the information;
• storing the generated descriptor information in the second storage section in the information transfer system;
• DMA transferring the information between the first storage section and the second storage section based on the descriptor information stored in the second storage section;
• and
• DMA transferring the descriptor information concerning the DMA transferred information from the second storage section to the first storage section, wherein
• when the DMA transfer of the information has been completed, the DMA transfer section DMA transfers descriptor information indicating completion of the DMA transfer of the information from the second storage section in the information transfer system to the first storage section in the information processing system, and
• the control section loads the descriptor information indicating the completion of the DMA transfer from the first storage section, wherein an I/O interface of the information processing system is connected to a network via a transmission section having a register, DMA transfer section, temporary storage and an interrupt generation section.

A program for causing a computer to execute a direct memory access (DMA) transfer method to DMA transfer information between a first storage section in an information processing system and a second storage section in an information transfer system, the method including the steps of:

• generating descriptor information that indicates a location at which the information is stored in the first storage section and a size of the information;
• storing the generated descriptor information in the second storage section in the information transfer system;
• DMA transferring the information between the first storage section and the second storage section based on the descriptor information stored in the second storage section;
• and
• DMA transferring the descriptor information concerning the DMA transferred information from the second storage section to the first storage section, wherein
• when the DMA transfer of the information has been completed, the DMA transfer section DMA transfers descriptor information indicating completion of the DMA transfer of the information from the second storage section in the information transfer system to the first storage section in the information processing system, and
• the control section loads the descriptor information indicating the completion of the DMA transfer from the first storage section, wherein an I/O interface of the information processing system is connected to a network via a transmission section having a register, DMA transfer section, temporary storage and an interrupt generation section.

A computer-readable storage medium that has stored therein a program for causing a computer to execute a direct memory access (DMA) transfer method to DMA transfer information between a first storage section in an information processing system and a second storage section in an information transfer system, the method including the steps of:

• generating descriptor information that indicates a location at which the information is stored in the first storage section and a size of the information;
• storing the generated descriptor information in the second storage section in the information transfer system;
• DMA transferring the information between the first storage section and the second storage section based on the descriptor information stored in the second storage section;
• and
• DMA transferring the descriptor information concerning the DMA transferred information from the second storage section to the first storage section, wherein
• when the DMA transfer of the information has been completed, the DMA transfer section DMA transfers descriptor information indicating completion of the DMA transfer of the information from the second storage section in the information transfer system to the first storage section in the information processing system, and
• the control section loads the descriptor information indicating the completion of the DMA transfer from the first storage section, wherein an I/O interface of the information processing system is connected to a network via a transmission section having a register, DMA transfer section, temporary storage and an interrupt generation section.

A DMA controller for DMA transferring information between first storage means in an information processing system and second storage means in an information transfer system, the DMA controller comprising:

• said second storage means for storing descriptor information that indicates a location at which the information is stored in the first storage means and a size of the information;
• and
• DMA transfer means for DMA transferring the information between the first storage means and said second storage means based on the descriptor information stored in said second storage section, wherein
• said DMA transfer means DMA transfers the descriptor information concerning the DMA transferred information from said second storage means to the first storage means, wherein
• when the DMA transfer of the information has been completed, the DMA transfer section DMA transfers descriptor information indicating completion of the DMA transfer of the information from the second storage section in the information transfer system to the first storage section in the information processing system, and
• the control section loads the descriptor information indicating the completion of the DMA transfer from the first storage section, wherein an I/O interface of the information processing system is connected to a network via a transmission section having a register, DMA transfer section, temporary storage and an interrupt generation section.