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Writing a BIOS bootloader for 64-bit mode from scratch
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One can fit a surprising amount of stuff in 512 bytes, but it’s easiest to just load some more data from disk first. The linker script linker.ld is important because it makes sure that the code in our boot sector is relocated to the right address in the final image. In long mode with Physical Address Extension enabled (PAE, we’ll do that below ), a four level page table is used.
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