Re: [Freedos-devel] New EMM386 update

[Michael D. <Fre...@de...>]

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.