Memory Management Unit: RISCV OS In Rust

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The first thing we do here is break apart the digital tackle and bodily tackle into its elements. Notice that we don't care about the web page offset--this is because the web page offset isn't stored. As a substitute, MemoryWave when the MMU interprets a virtual deal with, it copies the web page offset directly into the bodily address to kind a full 56-bit physical tackle. We'll use this as a floating reference in order that we will set // particular person entries as we stroll the desk. Now, we will traverse the page table and set the bits // properly. We expect the basis to be valid, however we're required to // create something past the root. In Rust, MemoryWave we create a spread iterator using the .. The .. operator is inclusive on start but exclusive on end. In this code, we first initialize the web page allocation system we created back in chapter 3.1. Then, we allocate a root table, which takes precisely 1 page (4096 bytes). The purpose of kind casting this memory handle back and forth is because we will ultimately need to write a physical tackle into the SATP (Supervisor MemoryWave Tackle Translation and Safety) register to get the MMU going. Now that now we have the root desk, we'd like to stay this into the PPN area of the SATP register. The PPN is basically the higher forty four bits of a 56-bit bodily tackle of the desk. What we do is shift the foundation table's handle to the best by 12 place, which primarily divides the address by a web page measurement.



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