systems available today.

Mode types

The unrestricted mode is often called kernel mode, but many other designations exist (master mode, supervisor mode, privileged mode, etc.). Restricted modes are usually referred to as user modes, but are also known by many other names (slave mode, problem state, etc.).

; Hypervisor
: Hypervisor mode is used to support virtualization, allowing the simultaneous operation of multiple operating systems.

; Kernel and user
: In kernel mode, the CPU may perform any operation

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