Add an architecture-specific implementation for
_CPU_Get_current_per_CPU_control() to reduce overhead for getting the
current CPU's Per_CPU_Control structure.
---
.../cpu/aarch64/include/rtems/score/cpuimpl.h | 23 +++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h
b/cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h
index 90fd48ad4e..ffdef2f30a 100644
--- a/cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h
+++ b/cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h
@@ -125,6 +125,29 @@ typedef struct {
uint64_t register_fpcr;
} CPU_Interrupt_frame;
+#ifdef RTEMS_SMP
+
+static inline
+struct Per_CPU_Control *_AARCH64_Get_current_per_CPU_control( void )
+{
+ struct Per_CPU_Control *cpu_self;
+ uint64_t value;
+
+ __asm__ volatile (
+ "mrs %0, TPIDR_EL1" : "=&r" ( value ) : : "memory"
+ );
+
+ /* Use EL1 Thread ID Register (TPIDR_EL1) */
+ cpu_self = (struct Per_CPU_Control *)(uintptr_t)value;
+
+ return cpu_self;
+}
+
+#define _CPU_Get_current_per_CPU_control() \
+ _AARCH64_Get_current_per_CPU_control()
+
+#endif /* RTEMS_SMP */
+
void _CPU_Context_volatile_clobber( uintptr_t pattern );
void _CPU_Context_validate( uintptr_t pattern );
--
2.30.2
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