Mark Pizzolato 2daa41ecb3 PDP11: Fixed bug in CSM (John Dundas) ...

John Dundas said:

Bob and all,

I ran across what I believe to be a bug in the CSM code:

         case 070:                                       /* CSM */
             if (CPUT (HAS_CSM) && (MMR3 & MMR3_CSM) || (cm != MD_KER)) {

According to the Architecture Handbook, CSM may be executed only if the MMR3 bit is set AND the mode is not Kernel.  Changing the code to:

         case 070:                                       /* CSM */
             if (CPUT (HAS_CSM) && (MMR3 & MMR3_CSM) && (cm != MD_KER)) {

also has the effect of making the ZKDKB0 diagnostic much happier.

Thanks,

John
--
John A. Dundas III

2013-12-06 10:54:56 -08:00

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