Linked by Thom Holwerda on Sat 9th Feb 2013 18:54 UTC
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Member since:
2011-04-11
It's possible to switch from long mode, it isn't even hard (just setup the new environment with interrupts disabled and then clear the long mode bit).
In comparison the only way to return to real mode in the 80286 was to setup some data in the realtime clock module and then do a hardware reset. When the processor have initialized it jumps to the reset vector in the BIOS and pretty early the BIOS code checks the RTC memory and if enabled it jumps to a specified code location.