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The Linux kernel configuration item CONFIG_CPU_USE_DOMAINS:

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This option enables or disables the use of domain switching using the DACR (domain access control register) to protect memory domains from each other. In Linux we use three domains: kernel, user and IO. The domains are used to protect userspace from kernelspace and to handle IO-space as a special type of memory by assigning manager or client roles to running code (such as a process).



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