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TODO: Assign bit in FR
Offset: 9 + (n/16)
Replaces the offset field in the gdt with the following:
Width: half the number of bits for the current mode
Value: pointer to array of chunks, physical address
Array of chunks:
Width: half the number of bits for the current mode
Value:
Upper (n - offset) bits:
Pointer to physical address >> offset
Lowest bit:
Present
Remaining bits:
Unused by this system
Each value in the array represents 1 << offset bytes of memory.
Physical address is calculated from a reference such that:
Physical address = (gdt[segment].chunks[addr>>offset].address << offset) | (lowest offset bits of addr)
Triggers a page fault if the present bit is not set
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