fix(cpus): workaround for Cortex-X4 erratum 2897503
Cortex-X4 erratum 2897503 is a Cat B erratum that applies
to all revisions <= r0p1 and is fixed in r0p2.
The workaround is to set CPUACTLR4_EL1[8] to 1.
SDEN documentation:
https://developer.arm.com/documentation/SDEN-2432808/latest
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I3178a890b6f1307b310e817af75f8fdfb8668cc9
diff --git a/lib/cpus/aarch64/cortex_x4.S b/lib/cpus/aarch64/cortex_x4.S
index 1220d38..75b2766 100644
--- a/lib/cpus/aarch64/cortex_x4.S
+++ b/lib/cpus/aarch64/cortex_x4.S
@@ -69,6 +69,12 @@
check_erratum_ls cortex_x4, ERRATUM(2816013), CPU_REV(0, 1)
+workaround_reset_start cortex_x4, ERRATUM(2897503), ERRATA_X4_2897503
+ sysreg_bit_set CORTEX_X4_CPUACTLR4_EL1, BIT(8)
+workaround_reset_end cortex_x4, ERRATUM(2897503)
+
+check_erratum_ls cortex_x4, ERRATUM(2897503), CPU_REV(0, 1)
+
workaround_reset_start cortex_x4, CVE(2022, 23960), WORKAROUND_CVE_2022_23960
#if IMAGE_BL31
/*
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index c55597a..2cbbdd2 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -839,6 +839,10 @@
# to revisions r0p0 and r0p1 of the Cortex-X4 cpu. It is fixed in r0p2.
CPU_FLAG_LIST += ERRATA_X4_2816013
+# Flag to apply erratum 2897503 workaround on reset. This erratum applies
+# to revisions r0p0 and r0p1 of the Cortex-X4 cpu. It is fixed in r0p2.
+CPU_FLAG_LIST += ERRATA_X4_2897503
+
# 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