Hi Rohini, On Wed, Jul 8, 2015 at 1:54 PM, Rohini Kulkarni <krohini1...@gmail.com> wrote: > Hi, > > I found this piece of code in confdefs.h > > #if defined(RTEMS_SMP) > > /* > * If configured for SMP, then we need to know the maximum CPU cores. > */ > #if !defined(CONFIGURE_SMP_APPLICATION) > #if !defined(CONFIGURE_SMP_MAXIMUM_PROCESSORS) > #define CONFIGURE_SMP_MAXIMUM_PROCESSORS 1 > #endif > #else > #if !defined(CONFIGURE_SMP_MAXIMUM_PROCESSORS) > #error "CONFIGURE_SMP_MAXIMUM_PROCESSORS not specified for SMP > Application" > #endif > #endif > #endif > > This piece of code gets the configured number of CPUs. I suppose this number > is not specified and will have to be specified by me somewhere in the > configurations. But I am unable to find out where. > Every BSP that supports SMP should define the number of cores/processors in its linkcmds file. For example have a look at Realview linkcmds file here [1]
[1] https://github.com/RTEMS/rtems/blob/master/c/src/lib/libbsp/arm/realview-pbx-a9/startup/linkcmds.realview_pbx_a9_qemu_smp#L1 > Thanks! > > > On Sat, Jul 4, 2015 at 4:07 PM, Rohini Kulkarni <krohini1...@gmail.com> > wrote: >> >> >> >> On Fri, Jul 3, 2015 at 10:43 PM, Joel Sherrill <joel.sherr...@oarcorp.com> >> wrote: >>> >>> >>> >>> On July 3, 2015 11:53:07 AM CDT, Rohini Kulkarni <krohini1...@gmail.com> >>> wrote: >>> >Any help that I can with this? >>> > >>> >On 1 Jul 2015 16:59, "Rohini Kulkarni" <krohini1...@gmail.com> wrote: >>> > >>> >Hi all, >>> > >>> >I wish to know where the maximum number of processors for a variant are >>> >configured. I took a look at some configure scripts. I could see the >>> >processor count defined for xilinx-zynq in its configuration file as >>> >ZYNQ_CPUS=2. >> >> This looks to be BSP specific and could originate in configure.ac or a >> .h file. >> I found this under ~/libbsp/arm/xilinx-zynq/configure >> # Check whether --enable-smp was given. >> if test "$rtems_cv_HAS_SMP" = "yes"; then : >> ZYNQ_CPUS="2" >> fi >>> >>> >>> It is likely that each BSP has an underlying hardware limit. >> >> Yes >>> >>> >>> > >>> >rtems_configuration_get_maximum_processors() called in gets this >>> >configured number. But I don't know from where. >>> >>> This is set initially based on the confdefs.h parameter >>> CONFIGURE_SMP_MAXIMUM_PROCESSORS or something close to that (on phone). >> >> Ya, I found this piece of code in confdefs.h >> #if defined(RTEMS_SMP) >> /* >> * If configured for SMP, then we need to know the maximum CPU cores. >> */ >> #if !defined(CONFIGURE_SMP_APPLICATION) >> #if !defined(CONFIGURE_SMP_MAXIMUM_PROCESSORS) >> #define CONFIGURE_SMP_MAXIMUM_PROCESSORS 1 >> #endif >> #else >> #if !defined(CONFIGURE_SMP_MAXIMUM_PROCESSORS) >> #error "CONFIGURE_SMP_MAXIMUM_PROCESSORS not specified for SMP >> Application" >> #endif >> #endif >> #endif >> >> This piece of code gets the configured number of CPUs. I suppose this >> number is not specified and will have to be specified by me somewhere in the >> configurations. But I am unable to find out where. >>> >>> Ultimately the maximum CPUs for an application is the lower of those >>> available or RTEMS is configured for. >> >> Yes. >>> >>> >>> >Also where is RTEMS_SMP defined for a bsp? >>> >>> A side-effect of building with --enable-smp. >> >> Oh,alright. >>> >>> >>> >>> >Thanks. >>> > >>> > >>> >-- >>> > >>> >Rohini Kulkarni >>> >>> --joel >> >> >> >> >> -- >> Rohini Kulkarni > > > > > -- > Rohini Kulkarni > > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel -- Hesham _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel