Hello Michael,
> I was a bit worried about the return address getting munged myself,
> but the fact of AX modification is a good reason for why the BIOS bug
> didn't keep biting, and the first patched worked.
the 'first patch' actually was the original - from the good old times
before Michael entered, and I was sole maintainer of HIMEM.
I don't know why pushf/cli/popf got even in there, as for any
selfrespecting BIOS, this should have *exactly* no effect (interrupts
are disabled by INT 15, and restored by iret)
So I assume that pushf/cli/popf got there in the first place because
some buggy real world bios was detected to
int15handler:
.....
sti
stc (or whatever flags should be returned)
retf 2
and to fix this bug.
Tom
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