The kernel is the trust branch of the operating system. It runs in the administrator mode.
The trap device instruction is accustomed to switch from user mode to the supervisor mode. It is hardened to implement system calls. A substitute to trap is using messages to obtain service from the operating system.
The trap device instruction is accustomed to switch from user mode to the supervisor mode. It is hardened to implement system calls. A substitute to trap is using messages to obtain service from the operating system.
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