Memory mapped Input/Output operations

A method of performing memory mapped input output operations to an alternate address space comprising:

• establishing a first instruction directed to a first memory mapped input output alternate address space associated with an adapter to store in accordance with a resource address designation having a plurality of fields of varying bit sizes with respect to one another, said resource address designation configured for decomposition thereof such that said first memory mapped input output alternate address space associated with said adapter is accessible;
• establishing a second instruction directed to said first memory mapped input output alternate address space associated with an adapter to load data in accordance with said resource address designation;
• and
• wherein a process issues at least one of said first instruction and said second instruction and thereby causes execution of at least one of said store and load with said first alternate address space and operates in a problem state of a machine.

A storage medium encoded with a machine-readable computer program code, said code including instructions for causing a computer to implement a method of performing memory mapped input output operations to an alternate address space, the method comprising:

• establishing a first instruction directed to a first memory mapped input output alternate address space associated with an adapter to store data in accordance with a resource address designation having a plurality of fields of varying bit sizes with respect to one another, said resource address designation configured for decomposition thereof such that said first memory mapped input output alternate address space associated with said adapter is accessible;
• establishing a second instruction directed to said first memory mapped input output alternate address space associated with an adapter to load data in accordance with said resource address designation;
• and
• wherein a process issues at least one of said first instruction and said second instruction and thereby causes execution of at least one of said store and load with said first alternate address space.

A system for performing memory mapped input output operations to an alternate address space comprising:

• a means for establishing a first instruction directed to a first memory mapped input output alternate address space associated with an adapter to store data in accordance with a resource address designation having a plurality of fields of varying bit sizes with respect to one another, said resource address designation configured for decomposition thereof such that said first memory mapped input output alternate address space associated with said adapter is accessible;
• a means for establishing a second instruction directed to said first memory mapped input output alternate address space associated with an adapter to load data in accordance with said definition(s) of resource address designation;
• and
• wherein a process issues at least one of said first instruction and said second instruction and thereby causes execution of at least one of said store and load with said first alternate address space.