Cortex A9:errata 794073 workaround
On Cortex A9 an errata can cause the processor to violate the rules for
speculative fetches when the MMU is off but branch prediction has not
been disabled. The workaround for this is to execute an Invalidate
Entire Branch Prediction Array (BPIALL) followed by a DSB.
see:http://arminfo.emea.arm.com/help/topic/com.arm.doc.uan0009d/UAN0009_cortex_a9_errata_r4.pdf
for more details.
Change-Id: I9146c1fa7563a79f4e15b6251617b9620a587c93
Signed-off-by: Joel Hutton <Joel.Hutton@arm.com>
diff --git a/lib/cpus/aarch32/cortex_a9.S b/lib/cpus/aarch32/cortex_a9.S
index 1fb10b2..7200343 100644
--- a/lib/cpus/aarch32/cortex_a9.S
+++ b/lib/cpus/aarch32/cortex_a9.S
@@ -35,6 +35,15 @@
bx lr
endfunc cortex_a9_enable_smp
+func check_errata_a9_794073
+#if ERRATA_A9_794073
+ mov r0, #ERRATA_APPLIES
+#else
+ mov r0, #ERRATA_MISSING
+#endif
+ bx lr
+endfunc check_errata_cve_2017_5715
+
func check_errata_cve_2017_5715
#if WORKAROUND_CVE_2017_5715
mov r0, #ERRATA_APPLIES
@@ -59,6 +68,7 @@
* checking functions of each errata.
*/
report_errata WORKAROUND_CVE_2017_5715, cortex_a9, cve_2017_5715
+ report_errata ERRATA_A9_794073, cortex_a9, a9_79407
pop {r12, lr}
bx lr