Changes in Nrtx

Cover Changes in Nrtx
Changes in Nrtx
Lou Salkind
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The system was too limited since the only operations a process could perform were allocating and freeing physical memory. There was no general way of sharing read-only text and data areas among many different processes.
In order to provide both protection and flexibility in our system, we decided to take advantage of the hardware memory management unit on our system board and provide a limited virtual memory system without demand paging. We felt this was a reasonable decision, since many one-bo
...ard systems for 32 bit micros now support both memory management and virtual memory. The main challenge was to do this in such a way that minimal overhead and complexity would be added to the system.
The new virtual memory interface is based on a segment model of memory. Each segment is a sub-interval of the total virtual address space available to a process and has various attributes, among which are: size The segment size is the range of virtual addresses in this segment, and is specified at the time the segment is created.


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