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authorSebastian Huber <sebastian.huber@embedded-brains.de>2014-04-22 10:10:39 +0200
committerSebastian Huber <sebastian.huber@embedded-brains.de>2014-04-28 09:26:18 +0200
commite5120a566c432dbe2c29acc7e02131896d827c5f (patch)
tree01d6848c0091505b79d3bdaa094d9f92f4e2c758
parent0c5beb8ecbed56034f7a7573b28872f487d127ee (diff)
downloadrtems-e5120a566c432dbe2c29acc7e02131896d827c5f.tar.bz2
score: Add _CPU_Get_current_per_CPU_control()
Add optional method _CPU_Get_current_per_CPU_control() to obtain the per-CPU control of the current processor. This is optional. Not every CPU port needs this. It is only an optional optimization variant. In case this macro is undefined, the default implementation using the current processor index will be used.
-rw-r--r--cpukit/score/cpu/no_cpu/rtems/score/cpu.h18
-rw-r--r--cpukit/score/include/rtems/score/percpu.h10
2 files changed, 25 insertions, 3 deletions
diff --git a/cpukit/score/cpu/no_cpu/rtems/score/cpu.h b/cpukit/score/cpu/no_cpu/rtems/score/cpu.h
index 5241b5ba5d..959fb58a6d 100644
--- a/cpukit/score/cpu/no_cpu/rtems/score/cpu.h
+++ b/cpukit/score/cpu/no_cpu/rtems/score/cpu.h
@@ -1462,6 +1462,24 @@ CPU_Counter_ticks _CPU_Counter_difference(
CPU_Counter_ticks first
);
+/**
+ * @brief Special register pointing to the per-CPU control of the current
+ * processor.
+ *
+ * This is optional. Not every CPU port needs this. It is only an optional
+ * optimization variant.
+ */
+register struct Per_CPU_Control *_CPU_Per_CPU_current asm( "rX" );
+
+/**
+ * @brief Optional method to obtain the per-CPU control of the current processor.
+ *
+ * This is optional. Not every CPU port needs this. It is only an optional
+ * optimization variant. In case this macro is undefined, the default
+ * implementation using the current processor index will be used.
+ */
+#define _CPU_Get_current_per_CPU_control() ( _CPU_Per_CPU_current )
+
#ifdef RTEMS_SMP
/**
* @brief Performs CPU specific SMP initialization in the context of the boot
diff --git a/cpukit/score/include/rtems/score/percpu.h b/cpukit/score/include/rtems/score/percpu.h
index afc38031df..a1b0a38900 100644
--- a/cpukit/score/include/rtems/score/percpu.h
+++ b/cpukit/score/include/rtems/score/percpu.h
@@ -235,7 +235,7 @@ typedef struct {
*
* This structure is used to hold per core state information.
*/
-typedef struct {
+typedef struct Per_CPU_Control {
/**
* @brief CPU port specific control.
*/
@@ -437,8 +437,12 @@ extern Per_CPU_Control_envelope _Per_CPU_Information[] CPU_STRUCTURE_ALIGNMENT;
* we can use _Per_CPU_Get_snapshot()). All other places must use
* _Per_CPU_Get() so that we can add checks for RTEMS_DEBUG.
*/
-#define _Per_CPU_Get_snapshot() \
- ( &_Per_CPU_Information[ _SMP_Get_current_processor() ].per_cpu )
+#if defined( _CPU_Get_current_per_CPU_control )
+ #define _Per_CPU_Get_snapshot() _CPU_Get_current_per_CPU_control()
+#else
+ #define _Per_CPU_Get_snapshot() \
+ ( &_Per_CPU_Information[ _SMP_Get_current_processor() ].per_cpu )
+#endif
#if defined( RTEMS_SMP )
static inline Per_CPU_Control *_Per_CPU_Get( void )