It's not possible without specific hardware support.
Context-switching on most current platforms with virtual memory requires fiddling with things like page mappings, and that simply must be done from supervisor mode.
The ability to switch tasks in hardware has existed on some historical machines. For example the GEC 4000 series basically implemented a microkernel, including the scheduler, in hardware. Switching to another process was done with a single hardware instruction.
I don't think anything current has such features besides the
long-obsolete and unused taskswitching feature on x86 processors.
Context-switching on most current platforms with virtual memory requires fiddling with things like page mappings, and that simply must be done from supervisor mode.
The ability to switch tasks in hardware has existed on some historical machines. For example the GEC 4000 series basically implemented a microkernel, including the scheduler, in hardware. Switching to another process was done with a single hardware instruction.
I don't think anything current has such features besides the long-obsolete and unused taskswitching feature on x86 processors.