Memory and Binding

The five types of binding we discussed

• Code time

• Load time

• Run time

• Link time

• Compile time

Logical address

• Generated by the CPU

• Generated by Spock

• The result of a bitwise operation

• The location of a variable in RAM

• Generated by the MMU

Physical address

• Location of your data in RAM

• Location of your house

• Generated by the CPU

• Also known as a virtual address

Base register

• Holds the lower address of the program

• Belongs to us

• Holds the lower address of the OS

• Selects the base number system used for address offset, e.g. hexadecimal, octal, binary, decimal

• Holds the upper address of the program

Limit register

• Holds the upper bound of the program address space

• Holds the upper bound of the OS address space

• Holds the value that a function return value approaches

• Limits the number of processes allowed per user. Display with ulimit -a