Add workaround for errata 1130799 for Cortex-A76
TLBI VAAE1 or TLBI VAALE1 targeting a page within hardware page
aggregated address translation data in the L2 TLB might cause
corruption of address translation data. Set bit 59 of CPUACTLR2_EL1 to
prevent this.
Change-Id: I59f3edea54e87d264e0794f5ca2a8c68a636e586
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
diff --git a/docs/cpu-specific-build-macros.rst b/docs/cpu-specific-build-macros.rst
index 73ed382..6a33441 100644
--- a/docs/cpu-specific-build-macros.rst
+++ b/docs/cpu-specific-build-macros.rst
@@ -145,6 +145,11 @@
- ``ERRATA_A75_790748``: This applies errata 790748 workaround to Cortex-A75
CPU. This needs to be enabled only for revision r0p0 of the CPU.
+For Cortex-A76, the following errata build flags are defined :
+
+- ``ERRATA_A76_1130799``: This applies errata 1130799 workaround to Cortex-A76
+ CPU. This needs to be enabled only for revision <= r2p0 of the CPU.
+
DSU Errata Workarounds
----------------------
diff --git a/lib/cpus/aarch64/cortex_a76.S b/lib/cpus/aarch64/cortex_a76.S
index 27db74e..8438fa6 100644
--- a/lib/cpus/aarch64/cortex_a76.S
+++ b/lib/cpus/aarch64/cortex_a76.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -189,6 +189,34 @@
b serror_aarch32
end_vector_entry cortex_a76_serror_aarch32
+ /* --------------------------------------------------
+ * Errata Workaround for Cortex A76 Errata #1130799.
+ * This applies only to revision <= r2p0 of Cortex A76.
+ * Inputs:
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * --------------------------------------------------
+ */
+func errata_a76_1130799_wa
+ /*
+ * Compare x0 against revision r2p0
+ */
+ mov x17, x30
+ bl check_errata_1130799
+ cbz x0, 1f
+ mrs x1, CORTEX_A76_CPUACTLR2_EL1
+ orr x1, x1 ,#(1 << 59)
+ msr CORTEX_A76_CPUACTLR2_EL1, x1
+ isb
+1:
+ ret x17
+endfunc errata_a76_1130799_wa
+
+func check_errata_1130799
+ mov x1, #0x20
+ b cpu_rev_var_ls
+endfunc check_errata_1130799
+
func check_errata_cve_2018_3639
#if WORKAROUND_CVE_2018_3639
mov x0, #ERRATA_APPLIES
@@ -206,8 +234,18 @@
ret
endfunc cortex_a76_disable_wa_cve_2018_3639
+ /* -------------------------------------------------
+ * The CPU Ops reset function for Cortex-A76.
+ * Shall clobber: x0-x19
+ * -------------------------------------------------
+ */
func cortex_a76_reset_func
mov x19, x30
+ bl cpu_get_rev_var
+
+#if ERRATA_A76_1130799
+ bl errata_a76_1130799_wa
+#endif
#if WORKAROUND_CVE_2018_3639
/* If the PE implements SSBS, we don't need the dynamic workaround */
@@ -271,6 +309,7 @@
* Report all errata. The revision-variant information is passed to
* checking functions of each errata.
*/
+ report_errata ERRATA_A76_1130799, cortex_a76, 1130799
report_errata WORKAROUND_CVE_2018_3639, cortex_a76, cve_2018_3639
report_errata ERRATA_DSU_936184, cortex_a76, dsu_936184
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index a7acd2f..4fe8ea1 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -131,6 +131,10 @@
# only to revision <= r0p0 of the Cortex A75 cpu.
ERRATA_A75_790748 ?=0
+# Flag to apply erratum 1130799 workaround during reset. This erratum applies
+# only to revision <= r2p0 of the Cortex A76 cpu.
+ERRATA_A76_1130799 ?=0
+
# Flag to apply T32 CLREX workaround during reset. This erratum applies
# only to r0p0 and r1p0 of the Neoverse N1 cpu.
ERRATA_N1_1043202 ?=1
@@ -212,6 +216,10 @@
$(eval $(call assert_boolean,ERRATA_A75_790748))
$(eval $(call add_define,ERRATA_A75_790748))
+# Process ERRATA_A76_1130799 flag
+$(eval $(call assert_boolean,ERRATA_A76_1130799))
+$(eval $(call add_define,ERRATA_A76_1130799))
+
# Process ERRATA_N1_1043202 flag
$(eval $(call assert_boolean,ERRATA_N1_1043202))
$(eval $(call add_define,ERRATA_N1_1043202))