Changeset e71e271 in rtems

Timestamp:

10/16/20 04:34:39 (3 years ago)

Author:

Sebastian Huber <sebastian.huber@…>

Branches:

5

Children:

7021c014

Parents:

3d7da435

git-author:

Sebastian Huber <sebastian.huber@…> (10/16/20 04:34:39)

git-committer:

Sebastian Huber <sebastian.huber@…> (10/16/20 04:41:32)

Message:

bsps/arm: Add workaround for Errata 794072

Add a workaround for Cortex-A9 Errata 845369: A short loop including a DMB
instruction might cause a denial of service on another which executes a CP15
broadcast operation.

Close #4114.

File:

• bsps/arm/include/bsp/arm-a9mpcore-start.h (modified) (2 diffs)

bsps/arm/include/bsp/arm-a9mpcore-start.h

@@ -126 +126 @@
 
 BSP_START_TEXT_SECTION static inline void
+arm_a9mpcore_start_errata_794072_handler(void)
+{
+  uint32_t diag;
+
+  /*
+   * Workaround for Errata 794072: A short loop including a DMB instruction
+   * might cause a denial of service on another which executes a CP15 broadcast
+   * operation.
+   */
+  diag = arm_cp15_get_diagnostic_control();
+  diag |= 1U << 4;
+  arm_cp15_set_diagnostic_control(diag);
+}
+
+BSP_START_TEXT_SECTION static inline void
 arm_a9mpcore_start_errata_845369_handler(void)
 {
@@ -153 +168 @@
 
 #ifdef RTEMS_SMP
+  arm_a9mpcore_start_errata_794072_handler();
   arm_a9mpcore_start_errata_845369_handler();
   arm_a9mpcore_start_enable_smp_in_auxiliary_control();