Linux Kernel

ULK Chapter #2 Chapter2. Memory Addressing * Types of Memory Address 1. Logical : Machine view; segments and offsets 2. Linear : Virtual address; Unsigned num upto 4 GB 3. Physical: Used to address memory cells in memory chips. They correspond to the electrical signals sent along the address pins of the microprocessor to the memory bus. Physical addresses are represented as 32-bit or 36-bit unsigned integers. Interaction between various address types ------------------------------------------ The Memory Management Unit (MMU) transforms a logical address into a linear address by means of a hardware circuit called a segmentation unit ; subsequently, a second hardware circuit called a paging unit transforms the linear address into a physical address Memory Arbiter ------------- In multiprocessor systems, all CPUs usually share the same memory; this means that RAM chips may be accessed concurrently by independent CPUs. Because read or write operations on a RAM chip must be performed se