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[pcbios] Guard against register corruption in INT 15,e820 implementat…
…ions Someone at Dell must have a full-time job designing ways to screw up implementations of INT 15,e820. This latest gem is courtesy of a Dell Xanadu system, which arbitrarily decides to obliterate the contents of %esi. Preserve %esi, %edi and %ebp across calls to INT 15,e820, in case someone tries a variation on this trick in future.
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Michael Brown
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Oct 23, 2008
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