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Each activation of a user process is preceded and succeeded by an activation of the corresponding kernel process. Accordingly both the user mode and kernel mode registers will be properly set whenever a process image is being executed in user mode.
The environment and stack pointers point into the user stack area. This begins as the upper part of the eighth user page, but may be extended downwards, e.g. to occupy the whole of the eighth page and part or all of the seventh page, etc.
Whereas the setting of the kernel segmentation registers is fairly trivial, setting the user segmentation registers is much less so.
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