On Nov 7, 2005, at 6:24 AM, Marcelo Tosatti wrote:
> Edson had to patch this in to get BDI to work on 85xx with 2.6.14.
How about we just change MSR_KERNEL and MSR_USER
in the include file #define instead of all of this run-time code?
Or, change the code so it preserves DE in general, so we don't
need a special kernel configuration just for the BDI?
The original reason I did the BDI_SWITCH was due to the
overhead of tracking user PTE switches in the context switch
code. I don't like the way this has been overloaded to mean
"BDI general operation." We should be able to attach a BDI2000
to any kernel configuration and always get kernel debugging
capability. The BDI_SWITCH was to enable the extra feature
(with some overhead) of debugging into user applications,
it never should have affected any kernel debug operation.
It's unfortunate that Book-E is such a PITA for debuggers,
but let's please find a better way of using these features.
Separate kernel configurations to enable hardware
debugging isn't acceptable.
Thanks.
-- Dan
