On 2/5/2024 11:15 AM, Bernd Böckmann via Freedos-devel wrote:
On 05.02.2024 19:56, Bret Johnson wrote:
That doesn't quite make sense, since 0 is just as much of a "garbage"
segment as any other random selector
It does! Because if you have a REGPACK as automatic object (on the
stack), this likely contains random values for DS and ES. I am not
that into protected mode, but I am very certain that it is a bad idea
not to initialize them, because if the values are not within the
limits of the GDT / LDT, this should throw a general protection fault,
no matter if DS or ES are dealt with at all.
But for real mode it should not matter that much. But it is not bad to
have the program crash soon as the error occurred. So my common
practice is to zero this union prior to using it...
Sorry, but if this is indeed an 8088/8086 (or even a V20) CPU, there is
no protected mode!!!!
Ralf
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