Linux Device Drivers Part - 2 : System Memory, Static Modules and Dynamic Modules
Before proceeding further, I strongly recommend you to watch Part-1 of Linux Device Drivers from MrTechpathi tutorials . In this part we will learn about following topics. System Memory Kernel Space and User Space Kernel Modules : Static Modules and Dynamic Modules So lets start with our first topic 1. System Memory This topic is choosen to completely understand user space and kernel space. Every system has certain amount of memory. This memory consists of RAM (Random Access Memory) cells, whose contents can be accessed (i.e., read and written to) at extremely high speeds but are retained only temporarily (i.e., while in use or, at most, while the power supply remains on). Coming to the purpose of memory, it holds programs and data that are currently in use and thereby serve as a high speed mediumbetween the CPU (central processing unit) and the much slower storages like hard disk drives (HDDs). This System memory in Linux can be divided into two distinct region