17 Sep
2015
17 Sep
'15
2:38 p.m.
On Thu, 17 Sep 2015, dwight wrote:
If working on a newer X86 processor, this is
necessary, not to protect the
code but because the code is cashed and my not be updated in time for
it to be executed.
Write through is expensive and only provided on the data side, if at all.
Dwight
On some/most older X86 real mode, a JMP $+2 would flush the prefetch
buffer, and make possible some simple self-modifying code (such as
changing the second byte of an INT instruction)