fix(errata): workaround for Cortex-A510 erratum 2971420
Cortex-A510 erratum 2971420 applies to revisions r0p1, r0p2, r0p3,
r1p0, r1p1, r1p2 and r1p3, and is still open.
Under some conditions, data might be corrupted if Trace Buffer
Extension (TRBE) is enabled. The workaround is to disable trace
collection via TRBE by programming MDCR_EL3.NSTB[1] to the opposite
value of SCR_EL3.NS on a security state switch. Since we only enable
TRBE for non-secure world, the workaround is to disable TRBE by
setting the NSTB field to 00 so accesses are trapped to EL3 and
secure state owns the buffer.
SDEN: https://developer.arm.com/documentation/SDEN-1873361/latest/
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ia77051f6b64c726a8c50596c78f220d323ab7d97
diff --git a/include/lib/cpus/aarch64/cortex_a510.h b/include/lib/cpus/aarch64/cortex_a510.h
index 337aac3..fb09411 100644
--- a/include/lib/cpus/aarch64/cortex_a510.h
+++ b/include/lib/cpus/aarch64/cortex_a510.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2022-2023, Arm Limited. All rights reserved.
+ * Copyright (c) 2022-2025, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -52,4 +52,12 @@
#define CORTEX_A510_CPUACTLR_EL1_DATA_CORRUPT_SHIFT U(18)
#define CORTEX_A510_CPUACTLR_EL1_DATA_CORRUPT_WIDTH U(1)
+#ifndef __ASSEMBLER__
+
+#if ERRATA_A510_2971420
+long check_erratum_cortex_a510_2971420(long cpu_rev);
+#endif
+
+#endif /* __ASSEMBLER__ */
+
#endif /* CORTEX_A510_H */
diff --git a/include/lib/cpus/errata.h b/include/lib/cpus/errata.h
index 9eae276..8e28d46 100644
--- a/include/lib/cpus/errata.h
+++ b/include/lib/cpus/errata.h
@@ -67,10 +67,8 @@
}
#endif
-#if ERRATA_A520_2938996 || ERRATA_X4_2726228
-unsigned int check_if_affected_core(void);
-#endif
+bool check_if_trbe_disable_affected_core(void);
int check_wa_cve_2024_7881(void);
bool errata_ich_vmcr_el2_applies(void);