fix(cpus): workaround for Cortex-A715 erratum 2429384

Cortex-A715 erratum 2429384 is a cat B erratum that applies to
revision r1p0 and is fixed in r1p1. The workaround is to set
bit[27] of CPUACTLR2_EL1. There is no workaround for revision
r0p0.

SDEN can be found here:
https://developer.arm.com/documentation/SDEN2148827/latest

Change-Id: I3cdb1b71567542174759f6946e9c81f77d0d993d
Signed-off-by: Bipin Ravi <biprav01@u203721.austin.arm.com>

docs/design/cpu-specific-build-macros.rst

@@ -876,6 +876,10 @@ For Cortex-A520, the following errata build flags are defined :
 
 For Cortex-A715, the following errata build flags are defined :
 
+-  ``ERRATA_A715_2429384``: This applies errata 2429384 workaround to
+   Cortex-A715 CPU. This needs to be enabled for revision r1p0. There is no
+   workaround for revision r0p0. It is fixed in r1p1.
+
 -  ``ERRATA_A715_2561034``: This applies errata 2561034 workaround to
    Cortex-A715 CPU. This needs to be enabled only for revision r1p0.
    It is fixed in r1p1.

lib/cpus/aarch64/cortex_a715.S

@@ -26,6 +26,12 @@
 	wa_cve_2022_23960_bhb_vector_table CORTEX_A715_BHB_LOOP_COUNT, cortex_a715
 #endif /* WORKAROUND_CVE_2022_23960 */
 
+workaround_reset_start cortex_a715, ERRATUM(2429384), ERRATA_A715_2429384
+        sysreg_bit_set CORTEX_A715_CPUACTLR2_EL1, BIT(27)
+workaround_reset_end cortex_a715, ERRATUM(2429384)
+
+check_erratum_range cortex_a715, ERRATUM(2429384), CPU_REV(1, 0), CPU_REV(1, 0)
+
 workaround_runtime_start cortex_a715, ERRATUM(2561034), ERRATA_A715_2561034
 	sysreg_bit_set	CORTEX_A715_CPUACTLR2_EL1, BIT(26)
 workaround_runtime_end cortex_a715, ERRATUM(2561034), NO_ISB

lib/cpus/cpu-ops.mk

@@ -907,6 +907,10 @@ CPU_FLAG_LIST += ERRATA_V2_2779510
 # This erratum applies to revisions r0p0, r0p1. Fixed in r0p2.
 CPU_FLAG_LIST += ERRATA_V2_2801372
 
+# Flag to apply erratum 2429384 workaround during reset. This erratum applies
+# to revision r1p0. There is no workaround for r0p0. It is fixed in r1p1.
+CPU_FLAG_LIST += ERRATA_A715_2429384
+
 # Flag to apply erratum 2561034 workaround during reset. This erratum applies
 # only to revision r1p0. It is fixed in r1p1.
 CPU_FLAG_LIST += ERRATA_A715_2561034

services/std_svc/errata_abi/errata_abi_main.c

@@ -435,10 +435,11 @@ struct em_cpu_list cpu_list[] = {
 {
 	.cpu_partnumber = CORTEX_A715_MIDR,
 	.cpu_errata_list = {
-		[0] = {2561034, 0x10, 0x10, ERRATA_A715_2561034},
-		[1] = {2701951, 0x00, 0x11, ERRATA_A715_2701951, \
+		[0] = {2429384, 0x00, 0x10, ERRATA_A715_2429384},
+		[1] = {2561034, 0x10, 0x10, ERRATA_A715_2561034},
+		[2] = {2701951, 0x00, 0x11, ERRATA_A715_2701951, \
 			ERRATA_NON_ARM_INTERCONNECT},
-		[2 ... ERRATA_LIST_END] = UNDEF_ERRATA,
+		[3 ... ERRATA_LIST_END] = UNDEF_ERRATA,
 	}
 },
 #endif /* CORTEX_A715_H_INC */