2. Structuring virtual space
As mentioned above, the virtual address space is constantly growing. The big question is whether or not to structure this virtual space. We'll call an unstructured virtual space "flat", and a structured virtual space "segmented", which obeys a certain number of rules. As the term "segment" is used in different contexts, we'll explain how it's used.
2.1 Flat virtual space
Flat virtual space is characterized by the use of an address whose length only increases over time. To provide a minimum of protection from other software, whether friend or foe, virtual space is divided into at least two zones, containing respectively safe software (operating system and libraries) and user software, often separated from each other. Mechanisms control passage between these zones....
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