Description: Development of a OS, even though most of the code, just use C/C++ and other high-level language can be, but at least the relevant parts of the code and hardware need to use assembly language, in addition, due to start part of the code is limited in size, with concise compilation can reduce the size of the object code. In addition, for some code that needs to be frequently invoked, use the assembly to improve performance. Therefore, we must understand the assembly language, even though you may not like it.
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AT&Tasm.pdf