fix(cpus): workaround for Cortex-A78C erratum 2376749
Cortex-A78C erratum 2376749 is a Cat B erratum that applies
to revisions r0p1 and r0p2 of the A78C and is currently open.
The workaround is to set CPUACTLR2_EL1[0] to 1 to force
PLDW/PFRM ST to behave like PLD/PRFM LD and not cause
invalidations to other PE caches.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN2004089/latest
Signed-off-by: Akram Ahmad <Akram.Ahmad@arm.com>
Change-Id: I3b29f4b7f167bf499d5d11ffef91a94861bd1383
diff --git a/lib/cpus/aarch64/cortex_a78c.S b/lib/cpus/aarch64/cortex_a78c.S
index 4f0bb49..49cebfe 100644
--- a/lib/cpus/aarch64/cortex_a78c.S
+++ b/lib/cpus/aarch64/cortex_a78c.S
@@ -18,6 +18,35 @@
#endif
/* --------------------------------------------------
+ * Errata Workaround for Cortex A78C Erratum 2376749.
+ * This applies to revision r0p1 and r0p2 of the A78C
+ * and is currently open. It is a Cat B erratum.
+ * Inputs:
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x4, x17
+ * --------------------------------------------------
+ */
+func errata_a78c_2376749_wa
+ /* Check revision */
+ mov x17, x30
+ bl check_errata_2376749
+ cbz x0, 1f
+ /* Set CPUACTLR2_EL1[0] to 1. */
+ mrs x1, CORTEX_A78C_CPUACTLR2_EL1
+ orr x1, x1, #CORTEX_A78C_CPUACTLR2_EL1_BIT_0
+ msr CORTEX_A78C_CPUACTLR2_EL1, x1
+1:
+ ret x17
+endfunc errata_a78c_2376749_wa
+
+func check_errata_2376749
+ /* Applies to r0p1 and r0p2*/
+ mov x1, #0x01
+ mov x2, #0x02
+ b cpu_rev_var_range
+endfunc check_errata_2376749
+
+/* --------------------------------------------------
* Errata Workaround for Cortex A78C Erratum 2395411.
* This applies to revision r0p1 and r0p2 of the A78C
* and is currently open. It is a Cat B erratum.
@@ -151,6 +180,11 @@
bl errata_a78c_2242638_wa
#endif
+#if ERRATA_A78C_2376749
+ mov x0, x18
+ bl errata_a78c_2376749_wa
+#endif
+
#if ERRATA_A78C_2395411
mov x0, x18
bl errata_a78c_2395411_wa
@@ -201,6 +235,7 @@
*/
report_errata ERRATA_A78C_2132064, cortex_a78c, 2132064
report_errata ERRATA_A78C_2242638, cortex_a78c, 2242638
+ report_errata ERRATA_A78C_2376749, cortex_a78c, 2376749
report_errata ERRATA_A78C_2395411, cortex_a78c, 2395411
report_errata WORKAROUND_CVE_2022_23960, cortex_a78c, cve_2022_23960