fix(cpus): workaround for Cortex-X3 erratum 2742421
Cortex-X3 erratum 2742421 is a Cat B erratum that applies to
all revisions <= r1p1 and is fixed in r1p2. The workaround is to
set CPUACTLR5_EL1[56:55] to 2'b01.
SDEN documentation:
https://developer.arm.com/documentation/2055130/latest
Signed-off-by: Sona Mathew <sonarebecca.mathew@arm.com>
Change-Id: Idadd323e419739fe909b9b68ea2dbe857846666b
diff --git a/lib/cpus/aarch64/cortex_x3.S b/lib/cpus/aarch64/cortex_x3.S
index c781d38..98d148e 100644
--- a/lib/cpus/aarch64/cortex_x3.S
+++ b/lib/cpus/aarch64/cortex_x3.S
@@ -42,6 +42,14 @@
check_erratum_ls cortex_x3, ERRATUM(2615812), CPU_REV(1, 1)
+workaround_reset_start cortex_x3, ERRATUM(2742421), ERRATA_X3_2742421
+ /* Set CPUACTLR5_EL1[56:55] to 2'b01 */
+ sysreg_bit_set CORTEX_X3_CPUACTLR5_EL1, CORTEX_X3_CPUACTLR5_EL1_BIT_55
+ sysreg_bit_clear CORTEX_X3_CPUACTLR5_EL1, CORTEX_X3_CPUACTLR5_EL1_BIT_56
+workaround_reset_end cortex_x3, ERRATUM(2742421)
+
+check_erratum_ls cortex_x3, ERRATUM(2742421), CPU_REV(1, 1)
+
workaround_reset_start cortex_x3, CVE(2022, 23960), WORKAROUND_CVE_2022_23960
#if IMAGE_BL31
override_vector_table wa_cve_vbar_cortex_x3
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 8df0a29..cbb0f20 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -738,6 +738,10 @@
# to revisions r0p0, r1p0, r1p1 of the Cortex-X3 cpu, it is still open.
CPU_FLAG_LIST += ERRATA_X3_2615812
+# Flag to apply erratum 2742421 workaround on reset. This erratum applies
+# to revisions r0p0, r1p0 and r1p1 of the Cortex-X3 cpu, it is fixed in r1p2.
+CPU_FLAG_LIST += ERRATA_X3_2742421
+
# Flag to apply erratum 1922240 workaround during reset. This erratum applies
# to revision r0p0 of the Cortex-A510 cpu and is fixed in r0p1.
CPU_FLAG_LIST += ERRATA_A510_1922240