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Protected mode

is the 32-bit mode which enables all of the 80386's advanced features. It allows a flat memory model which can address up to 4 GB of physical memory. It also provides a paging subsystem with a table look-aside buffer and other expected hardware supports for virtual memory. The hardware provides traps for such events as page faults, illegal accesses to memory, illegal instructions, and other actions that an operating system would like to manage.

Paco Hope
Wed Jun 21 23:54:28 EDT 1995