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Seeming inefficiency in the MRB #292
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I think I see why this was chosen, the MBR gets loaded to 0x7c00, but does Stage 2 really have to be as well? Can't it go somewhere else, to avoid this relocation? |
The caveat is there is no “stage 2”. The MBR loads the El Torito payload - which is also a first stage on its own. Both of those expect to be at |
That seems completely fair, although in the comments it is referred to as 'stage 2'. |
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At the moment the MBR does the following:
Why not load Stage 2 into 0x7c00 the first time? Just skip steps 7 and 8.
I can speculate that the
inc %eax
at line 29, makes it so that too much is loaded from the disk, but in that case, wouldn't it be easier to zero out0x7c00 + $BOOT_FILE_SIZE
until0x7c00 + dap_sectors * drive_params_bps
?Or is there another issue that I'm not seeing?
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