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License: MIT License
Mark's OS
License: MIT License
After splitting Kernel Space and Non-Kernel Space and adding Paging mechanism, copying between different processes (with different privileges) is required.
Between kernel and non-kernel processes (Ring 0 <-> Ring 1, 2, 3):
Between non-kernel processes (Ring 1, 2, 3 <-> Ring 1, 2, 3)
Need to add cache layer, including a series of blocks cached in memory and a table of descriptors, in function "hdd_sector_dev_op()" of "hdd.c".
Descriptor: block number, block status (INVALID, CLEAR, DIRTY), the address of the block in memory.
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