问题
Is it possible to have paging enabled in real mode, for example during BIOS execution. If it is enabled what is the use of having paging in real mode
回答1:
No, From Intel Manual Vol 3A Chapter 2.5
Paging (bit 31 of CR0) — Enables paging when set; disables paging when clear. When paging is disabled, all linear addresses are treated as physical addresses. The PG flag has no effect if the PE flag (bit 0 of register CR0) is not also set; setting the PG flag when the PE flag is clear causes a general-protection exception (#GP). See also: Chapter 4, “Paging.”
(Emphasis mine)
来源：https://stackoverflow.com/questions/31113177/is-it-possible-to-have-paging-enabled-in-real-mode