At 06:57 AM 11/24/2004 +0300, Arkady V.Belousov wrote:
AFAIK, all newer CPUs (starting from Pentium) syncronize code cache with self-modifying code (SMC). This is why on newer CPUs you can't detect pipe length through modifying followinf instructions. On the other side, I hear, that on some CPUs to force cache resetting, should be performed _back_ jump.
So we need somebody with an ancient 486-only machine to test a program which goes something like:
xor edx,edx mov edx,cr0 mov edi,-1 mov edi,cr0 cmp edi,edx jne failure success:
386 should work with the JMP since it predates WBINVD.
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