arm: Add CPU specific idle thread for ARMv7

cpukit/score/cpu/arm/Makefile.am

@@ -25,6 +25,7 @@ libscorecpu_a_SOURCES += arm_exc_handler_high.c
 libscorecpu_a_SOURCES += arm-exception-frame-print.c
 libscorecpu_a_SOURCES += arm-exception-default.c
 libscorecpu_a_SOURCES += armv4-exception-default.S
+libscorecpu_a_SOURCES += armv7-thread-idle.c
 libscorecpu_a_SOURCES += armv7m-context-initialize.c
 libscorecpu_a_SOURCES += armv7m-context-restore.c
 libscorecpu_a_SOURCES += armv7m-context-switch.c
@@ -41,7 +42,6 @@ libscorecpu_a_SOURCES += armv7m-isr-level-get.c
 libscorecpu_a_SOURCES += armv7m-isr-level-set.c
 libscorecpu_a_SOURCES += armv7m-isr-vector-install.c
 libscorecpu_a_SOURCES += armv7m-multitasking-start-stop.c
-libscorecpu_a_SOURCES += armv7m-thread-idle.c
 
 include $(srcdir)/preinstall.am
 include $(top_srcdir)/automake/local.am

cpukit/score/cpu/arm/armv7-thread-idle.c

@@ -24,7 +24,7 @@
 
 #include <rtems/score/cpu.h>
 
-#ifdef ARM_MULTILIB_ARCH_V7M
+#ifdef ARM_MULTILIB_HAS_WFI
 
 void *_CPU_Thread_Idle_body( uintptr_t ignored )
 {
@@ -33,4 +33,4 @@ void *_CPU_Thread_Idle_body( uintptr_t ignored )
   }
 }
 
-#endif /* ARM_MULTILIB_ARCH_V7M */
+#endif /* ARM_MULTILIB_HAS_WFI */

cpukit/score/cpu/arm/rtems/score/arm.h

@@ -37,6 +37,12 @@ extern "C" {
   #define ARM_MULTILIB_ARCH_V4
 #endif
 
+#if defined(__ARM_ARCH_7A__) \
+  || defined(__ARM_ARCH_7R__) \
+  || defined(__ARM_ARCH_7M__)
+  #define ARM_MULTILIB_HAS_WFI
+#endif
+
 #if defined(__ARM_NEON__)
   #define ARM_MULTILIB_VFP_D32
 #elif !defined(__SOFTFP__)

cpukit/score/cpu/arm/rtems/score/cpu.h

@@ -138,7 +138,7 @@
 
 #define CPU_USE_DEFERRED_FP_SWITCH FALSE
 
-#if defined(ARM_MULTILIB_ARCH_V7M)
+#if defined(ARM_MULTILIB_HAS_WFI)
   #define CPU_PROVIDES_IDLE_THREAD_BODY TRUE
 #else
   #define CPU_PROVIDES_IDLE_THREAD_BODY FALSE