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Some CPUs provide for more than two modes of operation what are two possible uses of these multiple modes?
Wiki User
∙ 12y ago
Although most systems only distinguish between user and
kernel modes, some CPUs have supported multiple modes. Multiple
modes could be used to provide a finer-grained security policy. For
example, rather than distinguishing between just user and kernelmode,
you could distinguish between different types of user mode. Perhaps
users belonging to the same group could execute each other's code. The
machine would go into a specified mode when one of these users was
running code. When the machine was in this mode, a member of the
group could run code belonging to anyone else in the group.
Another possibility would be to provide different distinctions within
kernel code. For example, a specific mode could allow USB device drivers
to run. This would mean that USB devices could be serviced without
having to switch to kernel mode, thereby essentially allowing USB device
drivers to run in a quasi-user/kernel mode.
Wiki User
∙ 12y ago
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Some CPU's provide for more than two modes of operation. What are two possible uses of these multiple modes?
Although most systems only distinguish between user and kernel modes, some CPUs have supported multiple modes. Multiple modes could be used to provide a finer-grained security policy. For example, rather than distinguishing between just user and kernelmode, you could distinguish between different types of user mode. Perhaps users belonging to the same group could execute each other's code. The machine would go into a specified mode when one of these users was running code. When the machine was in this mode, a member of the group could run code belonging to anyone else in the group. Another possibility would be to provide different distinctions within kernel code. For example, a specific mode could allow USB device drivers to run. This would mean that USB devices could be serviced without having to switch to kernel mode, thereby essentially allowing USB device drivers to run in a quasi-user/kernel mode.
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