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x86. Suppose this OS structure allows device drivers to be implemented at user-level. On the x86 architecture a general protection fault occurs if we attempt to trap to a ring of protection less privileged than the current protection domain. Briefly explain how we can invoke user-level device drivers from the kernel (by essentially performing the opposite

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x86. Suppose this OS structure allows device drivers to be implemented at user-level. On the x86 arc...
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