October 2018
Beginner
794 pages
19h 23m
English
Content preview from Hands-On System Programming with Linux
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No VM – the problem
Let's imagine for a moment that VM, and all the complex baggage it lugs around, does not exist. So, we're working on a (fictional) pure flat physical memory platform with, say, 64 MB RAM. This is actually not that unusual – most old OSes (think DOS) and even modern Real-Time Operating Systems (RTOSes) operate this way:
Figure 1: Flat physical address space of 64 MB
Obviously, everything that runs on this machine must share this physical memory space: the OS, device drivers, libraries, and applications. We might visualize it this way (of course, this is not intended to reflect an actual system – it's just a highly simplified ...
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