Messages in this thread | | | From | Ravi Bangoria <> | Subject | Re: [PATCH 00/15] powerpc/watchpoint: Preparation for more than one watchpoint | Date | Mon, 23 Mar 2020 19:07:32 +0530 |
| |
On 3/18/20 6:22 PM, Ravi Bangoria wrote: > > > On 3/16/20 8:35 PM, Christophe Leroy wrote: >> >> >> Le 09/03/2020 à 09:57, Ravi Bangoria a écrit : >>> So far, powerpc Book3S code has been written with an assumption of only >>> one watchpoint. But future power architecture is introducing second >>> watchpoint register (DAWR). Even though this patchset does not enable >>> 2nd DAWR, it make the infrastructure ready so that enabling 2nd DAWR >>> should just be a matter of changing count. >> >> Some book3s (e300 family for instance, I think G2 as well) already have a DABR2 in addition to DABR. >> Will this series allow to use it as well ? > > I wasn't aware of that. I'll take a look at their specs and check if they > can piggyback on this series for 2nd DABR.
There are some differences between G2/e300 DABRs and Book3S DAWRs. G2/e300 DABRs provides some functionalities like "Match if EA less/greater than DABR", "combined mode" etc. are not present with DAWRs. DBCR on G2/e300 also provides which DABR caused the exception. So this series might not directly allow to use DABR2 but, I guess, it should work as base infrastructure.
Ravi
| |