In the days before Windows, this is a very important function, but the 32-bit "protected mode" software does not use BIOS, therefore the use of this feature and even less.
在Windows以前，这是一个非常重要的功能，但是32位的“保护模式”软件不使用BIOS，因此今天这个功能的用途就更少了。
NTLDR loads the basic memory configuration and switches to 32-bit mode (protected mode). NTLDR then places itself into high memory to free up as much memory space as possible.
NTLDR载入基本的内存配置并转为32位模式(保护模式)。然后NTLDR将自己放入高内存以尽可能多地释放内存。
For a code to be able to run with access to 64-bit registers, another kind of protected mode is employed, called long mode.
一个代码能够访问64位寄存器，采用另一种保护模式，称为长模式。
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