本文章深入探讨了内存管理技术，特别是操作系统如何利用现代微处理器的硬件电路来高效且稳健地管理物理内存。通过详细讲解80x86微处理器的内存寻址机制及Linux操作系统中这些机制的具体应用，读者不仅能理解分页的一般理论，还能了解如何在其他平台上研究内存管理的实现。
This chapter deals with addressing techniques. Luckily, an operating system is not forced to keep track of physical memory all by itself; today's microprocessors include several hardware circuits to make memory management both more efficient and more robust so that programming errors cannot cause improper accesses to memory outside the program.
As in the rest of this book, we offer details in this chapter on how 80 x 86 microprocessors address memory chips and how Linux uses the available addressing circuits. You will find, we hope, that when you learn the implementation details on Linux's most popular platform you will better understand both the general theory of paging and how to research the implementation on other platforms.
This is the first of three chapters related to memory management; Chapter 8 discusses how the kernel allocates main memory to itself, while Chapter 9 considers how linear addresses are assigned to processes.
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