Merge "fix(errata): workaround for Cortex-A710 erratum 2371105" into integration

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

@@ -472,6 +472,10 @@ For Cortex-A710, the following errata build flags are defined :
    Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
    of the CPU and is fixed in r2p1.
 
+-  ``ERRATA_A710_2371105``: This applies errata 2371105 workaround to
+   Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
+   of the CPU and is fixed in r2p1.
+
 For Neoverse N2, the following errata build flags are defined :
 
 -  ``ERRATA_N2_2002655``: This applies errata 2002655 workaround to Neoverse-N2

include/lib/cpus/aarch64/cortex_a710.h

@@ -35,6 +35,7 @@
  * CPU Auxiliary Control register 2 specific definitions.
  ******************************************************************************/
 #define CORTEX_A710_CPUACTLR2_EL1				S3_0_C15_C1_1
+#define CORTEX_A710_CPUACTLR2_EL1_BIT_40			(ULL(1) << 40)
 
 /*******************************************************************************
  * CPU Auxiliary Control register 5 specific definitions.

lib/cpus/aarch64/cortex_a710.S

@@ -353,6 +353,34 @@ func check_errata_2008768
 	b       cpu_rev_var_ls
 endfunc check_errata_2008768
 
+/* -------------------------------------------------------
+ * Errata Workaround for Cortex-A710 Erratum 2371105.
+ * This applies to revisions <= r2p0 and is fixed in r2p1.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * -------------------------------------------------------
+ */
+func errata_a710_2371105_wa
+	/* Check workaround compatibility. */
+	mov	x17, x30
+	bl	check_errata_2371105
+	cbz	x0, 1f
+
+	/* Set bit 40 in CPUACTLR2_EL1 */
+	mrs	x1, CORTEX_A710_CPUACTLR2_EL1
+	orr	x1, x1, #CORTEX_A710_CPUACTLR2_EL1_BIT_40
+	msr	CORTEX_A710_CPUACTLR2_EL1, x1
+	isb
+1:
+	ret	x17
+endfunc errata_a710_2371105_wa
+
+func check_errata_2371105
+	/* Applies to <= r2p0. */
+	mov	x1, #0x20
+	b	cpu_rev_var_ls
+endfunc check_errata_2371105
+
 func check_errata_cve_2022_23960
 #if WORKAROUND_CVE_2022_23960
 	mov	x0, #ERRATA_APPLIES
@@ -410,6 +438,7 @@ func cortex_a710_errata_report
 	report_errata ERRATA_A710_2136059, cortex_a710, 2136059
 	report_errata ERRATA_A710_2282622, cortex_a710, 2282622
 	report_errata ERRATA_A710_2008768, cortex_a710, 2008768
+	report_errata ERRATA_A710_2371105, cortex_a710, 2371105
 	report_errata WORKAROUND_CVE_2022_23960, cortex_a710, cve_2022_23960
 	report_errata ERRATA_DSU_2313941, cortex_a710, dsu_2313941
 
@@ -476,6 +505,11 @@ func cortex_a710_reset_func
 	bl	errata_a710_2282622_wa
 #endif
 
+#if ERRATA_A710_2371105
+	mov	x0, x18
+	bl	errata_a710_2371105_wa
+#endif
+
 #if IMAGE_BL31 && WORKAROUND_CVE_2022_23960
 	/*
 	 * The Cortex-A710 generic vectors are overridden to apply errata

lib/cpus/cpu-ops.mk

@@ -524,6 +524,10 @@ ERRATA_A710_2282622	?=0
 # to revision r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is fixed in r2p1.
 ERRATA_A710_2008768	?=0
 
+# Flag to apply erratum 2371105 workaround during reset. This erratum applies
+# to revision r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is fixed in r2p1.
+ERRATA_A710_2371105	?=0
+
 # Flag to apply erratum 2067956 workaround during reset. This erratum applies
 # to revision r0p0 of the Neoverse N2 cpu and is still open.
 ERRATA_N2_2067956	?=0
@@ -1079,6 +1083,10 @@ $(eval $(call add_define,ERRATA_A710_2282622))
 $(eval $(call assert_boolean,ERRATA_A710_2008768))
 $(eval $(call add_define,ERRATA_A710_2008768))
 
+# Process ERRATA_A710_2371105 flag
+$(eval $(call assert_boolean,ERRATA_A710_2371105))
+$(eval $(call add_define,ERRATA_A710_2371105))
+
 # Process ERRATA_N2_2067956 flag
 $(eval $(call assert_boolean,ERRATA_N2_2067956))
 $(eval $(call add_define,ERRATA_N2_2067956))