ARM协处理器CP15（设置MMU，cache等）学习

               

作者：wogoyixikexie@gliet

    一直对协处理器CP15很恐惧，因为在网上基本上找不到中文的详细说明，现在找了一些ARM官方文档（ARM920T Technical Reference Manual）来看，准备对它做个了结。

    协处理器CP15包含了如下寄存器。

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在ARM920T Technical Reference Manual中有如下关键术语

2.3.1 Addresses in ARM920T
Three distinct types of address exist in an ARM920T system:
• Virtual Address (VA)
• Modified Virtual Address (MVA)
• Physical Address (PA).
Below is an example of the address manipulation when the ARM9TDMI core requests
an instruction (see Figure 2-10 on page 2-25).
1. The Instruction VA (IVA) is issued by the ARM9TDMI core.
2. This is translated by the ProcID to the Instruction MVA (IMVA). It is the IMVA
that the Instruction Cache (ICache) and MMU see.
3. If the protection check carried out by the IMMU on the IMVA does not abort, and
the IMVA tag is in the ICache