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to 0x600 via a 'rep movsw'. Once that was done, %cx was zero, so we could simply use 'movb' to update the lower byte of %cx in preparation for zeroing out the fake partition entry used to boot to other drives via F5. Well, in the new boot0, we don't actually relocate ourselves, instead it is easier to create the fake partition entry first and then just use it to get the BIOS to load all of boot0 into memory at 0x600. However, since we aren't doing the relocate code anymore, we don't know that %cx == 0 when we hit the 'movb' to setup %cx for clearning the fake partition entry. Thus, if %ch != 0 when the BIOS started boot0, then it would end up zeroing a lot more memory than just 8 words. The solution is to do a word move of $8 into %cx. Debugging help from: David Wolfskill <dhw@whistle.com> |
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| .. | ||
| boot0 | ||
| boot2 | ||
| btx | ||
| cdboot | ||
| cdldr | ||
| gptboot | ||
| kgzldr | ||
| libi386 | ||
| liloldr | ||
| loader | ||
| mbr | ||
| pxeldr | ||
| Makefile | ||
| Makefile.inc | ||