fix(cpus): workaround for Neoverse V1 errata 2743233
Neoverse V1 erratum 2743233 is a Cat B erratum that applies to
all revisions <= r1p2 and is still open.
The workaround sets CPUACTLR5_EL1[56:55] to 2'b01.
SDEN documentation: https://developer.arm.com/documentation/SDEN1401781/latest
Change-Id: If51a6f4293fa8b5b35c44edd564ebb715ba309a1
Signed-off-by: Sona Mathew <SonaRebecca.Mathew@arm.com>
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 9db29e6..4caea30 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -476,6 +476,10 @@
CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 of the
CPU. It is still open.
+- ``ERRATA_V1_2743233``: This applies erratum 2743233 workaround to Neoverse-V1
+ CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2 of the
+ CPU. It is still open.
+
- ``ERRATA_V1_2779461``: This applies erratum 2779461 workaround to Neoverse-V1
CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, r1p2 of the
CPU. It is still open.
diff --git a/include/lib/cpus/aarch64/neoverse_v1.h b/include/lib/cpus/aarch64/neoverse_v1.h
index 4c10484..3d48623 100644
--- a/include/lib/cpus/aarch64/neoverse_v1.h
+++ b/include/lib/cpus/aarch64/neoverse_v1.h
@@ -43,4 +43,6 @@
#define NEOVERSE_V1_ACTLR3_EL1 S3_0_C15_C1_2
+#define NEOVERSE_V1_ACTLR5_EL1 S3_0_C15_C9_0
+
#endif /* NEOVERSE_V1_H */
diff --git a/lib/cpus/aarch64/neoverse_v1.S b/lib/cpus/aarch64/neoverse_v1.S
index f9a5789..363c2e6 100644
--- a/lib/cpus/aarch64/neoverse_v1.S
+++ b/lib/cpus/aarch64/neoverse_v1.S
@@ -486,6 +486,37 @@
b cpu_rev_var_ls
endfunc check_errata_2743093
+ /* ---------------------------------------------------
+ * Errata Workaround for Neoverse V1 Errata #2743233.
+ * This applies to revisions r0p0, r1p0, r1p1 and r1p2.
+ * It is still open.
+ * x0: variant[4:7] and revisions[0:3] of current cpu.
+ * Shall clobber: x0-x1, x17
+ * ---------------------------------------------------
+ */
+func errata_neoverse_v1_2743233_wa
+ /* Check revision. */
+ mov x17, x30
+ bl check_errata_2743233
+ cbz x0, 1f
+
+ /* Apply the workaround */
+ mrs x1, NEOVERSE_V1_ACTLR5_EL1
+ bic x1, x1, #BIT(56)
+ orr x1, x1, #BIT(55)
+ msr NEOVERSE_V1_ACTLR5_EL1, x1
+
+1:
+ ret x17
+endfunc errata_neoverse_v1_2743233_wa
+
+func check_errata_2743233
+ /* Applies to r0p0, r1p0, r1p1 and r1p2 */
+ mov x1, #CPU_REV(1,2)
+ b cpu_rev_var_ls
+endfunc check_errata_2743233
+
+
/* ----------------------------------------------------
* Errata Workaround for Neoverse V1 Errata #2779461.
* This applies to revisions r0p0, r1p0, r1p1, and r1p2.
@@ -573,6 +604,7 @@
report_errata ERRATA_V1_2294912, neoverse_v1, 2294912
report_errata ERRATA_V1_2372203, neoverse_v1, 2372203
report_errata ERRATA_V1_2743093, neoverse_v1, 2743093
+ report_errata ERRATA_V1_2743233, neoverse_v1, 2743233
report_errata ERRATA_V1_2779461, neoverse_v1, 2779461
report_errata WORKAROUND_CVE_2022_23960, neoverse_v1, cve_2022_23960
@@ -652,6 +684,11 @@
bl errata_neoverse_v1_2372203_wa
#endif
+#if ERRATA_V1_2743233
+ mov x0, x18
+ bl errata_neoverse_v1_2743233_wa
+#endif
+
#if ERRATA_V1_2779461
mov x0, x18
bl errata_neoverse_v1_2779461_wa
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 4582f28..9cd5edd 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -530,6 +530,11 @@
# still open.
ERRATA_V1_2743093 ?=0
+# Flag to apply erratum 2743233 workaround during powerdown. This erratum
+# applies to revisions r0p0, r1p0, r1p1 and r1p2 of the Neoverse V1 cpu and is
+# still open.
+ERRATA_V1_2743233 ?=0
+
# Flag to apply erratum 2779461 workaround during powerdown. This erratum
# applies to revisions r0p0, r1p0, r1p1 and r1p2 of the Neoverse V1 cpu and is
# still open.
@@ -1212,6 +1217,10 @@
$(eval $(call assert_boolean,ERRATA_V1_2743093))
$(eval $(call add_define,ERRATA_V1_2743093))
+# Process ERRATA_V1_2743233 flag
+$(eval $(call assert_boolean,ERRATA_V1_2743233))
+$(eval $(call add_define,ERRATA_V1_2743233))
+
# Process ERRATA_V1_2779461 flag
$(eval $(call assert_boolean,ERRATA_V1_2779461))
$(eval $(call add_define,ERRATA_V1_2779461))