5
Hardware-Software Interface
Most computer software is not written at the processor instruction level in assembly language. Almost all the applications we work with daily are written in one high-level programming language or another, relying on pre-existing libraries of capabilities that the application programmers built upon during the software development process. Practical programming environments, consisting of high-level languages and their associated libraries, offer many services, including disk input/output (I/O), network communication, and interactions with users, all easily accessible from program code.
This chapter describes the software layers that implement these features, beginning with processor instructions within device drivers. ...
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