[Bug 1898] New: Optional CPU dependent _Per_CPU_Information attributes

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=1898

           Summary: Optional CPU dependent _Per_CPU_Information attributes
           Product: RTEMS
           Version: HEAD
          Platform: All
        OS/Version: RTEMS
            Status: NEW
          Severity: normal
          Priority: P3
         Component: cpukit
        AssignedTo: joel.sherrill at oarcorp.com
        ReportedBy: sebastian.huber at embedded-brains.de


I would like to add optional CPU dependent _Per_CPU_Information attributes:

Index: score/include/rtems/score/percpu.h
===================================================================
RCS file: /usr1/CVS/rtems/cpukit/score/include/rtems/score/percpu.h,v
retrieving revision 1.12
diff -u -r1.12 percpu.h
--- score/include/rtems/score/percpu.h  15 Jul 2011 14:36:37 -0000      1.12
+++ score/include/rtems/score/percpu.h  16 Aug 2011 11:42:19 -0000
@@ -216,7 +216,8 @@
  *
  *  This is an array of per CPU core information.
  */
-extern Per_CPU_Control _Per_CPU_Information[];
+extern CPU_PER_CPU_INFORMATION_ATTRIBUTES Per_CPU_Control
+  _Per_CPU_Information[];

 #if defined(RTEMS_SMP)
 /**

This allows to place the _Per_CPU_Information table into special memory regions
e.g. the small data area.  On some CPUs this can lead to slightly optimized
load and store instructions.

This define should be placed into <rtems/score/cpu.h>.  The default is
undefined.

Example:

#define CPU_PER_CPU_INFORMATION_ATTRIBUTES __attribute__((section(".sdata")))

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