fix(errata): workarounds for cortex-x1 errata
This patch adds workarounds for following cortex-x1 errata:
- 1821534 (CatB)
- 1688305 (CatB)
- 1827429 (CatB)
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1401782/latest
Signed-off-by: Okash Khawaja <okash@google.com>
Change-Id: I10ebe8d5c56a6d273820bb2c682f21bf98daa7a5
diff --git a/lib/cpus/aarch64/cortex_x1.S b/lib/cpus/aarch64/cortex_x1.S
index 3ec0f2d..c8bc190 100644
--- a/lib/cpus/aarch64/cortex_x1.S
+++ b/lib/cpus/aarch64/cortex_x1.S
@@ -18,8 +18,116 @@
#error "Cortex-X1 supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
#endif
+/* --------------------------------------------------
+ * Errata Workaround for X1 Erratum 1821534.
+ * This applies to revision r0p0 and r1p0 of X1.
+ * Inputs:
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * --------------------------------------------------
+ */
+func errata_x1_1821534_wa
+ /* Compare x0 against revision r1p0 */
+ mov x17, x30
+ bl check_errata_1821534
+ cbz x0, 1f
+ mrs x1, CORTEX_X1_ACTLR2_EL1
+ orr x1, x1, BIT(2)
+ msr CORTEX_X1_ACTLR2_EL1, x1
+ isb
+1:
+ ret x17
+endfunc errata_x1_1821534_wa
+
+func check_errata_1821534
+ /* Applies to r0p0 and r1p0 */
+ mov x1, #0x10
+ b cpu_rev_var_ls
+endfunc check_errata_1821534
+
+/* --------------------------------------------------
+ * Errata Workaround for X1 Erratum 1688305.
+ * This applies to revision r0p0 and r1p0 of X1.
+ * Inputs:
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * --------------------------------------------------
+ */
+func errata_x1_1688305_wa
+ /* Compare x0 against revision r1p0 */
+ mov x17, x30
+ bl check_errata_1688305
+ cbz x0, 1f
+ mrs x0, CORTEX_X1_ACTLR2_EL1
+ orr x0, x0, BIT(1)
+ msr CORTEX_X1_ACTLR2_EL1, x0
+ isb
+
+1:
+ ret x17
+endfunc errata_x1_1688305_wa
+
+func check_errata_1688305
+ /* Applies to r0p0 and r1p0 */
+ mov x1, #0x10
+ b cpu_rev_var_ls
+endfunc check_errata_1688305
+
+/* --------------------------------------------------
+ * Errata Workaround for X1 Erratum 1827429.
+ * This applies to revision r0p0 and r1p0 of X1.
+ * Inputs:
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * --------------------------------------------------
+ */
+func errata_x1_1827429_wa
+ /* Compare x0 against revision r1p0 */
+ mov x17, x30
+ bl check_errata_1827429
+ cbz x0, 1f
+ mrs x0, CORTEX_X1_CPUECTLR_EL1
+ orr x0, x0, BIT(53)
+ msr CORTEX_X1_CPUECTLR_EL1, x0
+ isb
+
+1:
+ ret x17
+endfunc errata_x1_1827429_wa
+
+func check_errata_1827429
+ /* Applies to r0p0 and r1p0 */
+ mov x1, #0x10
+ b cpu_rev_var_ls
+endfunc check_errata_1827429
+
+ /* -------------------------------------------------
+ * The CPU Ops reset function for Cortex-X1.
+ * Shall clobber: x0-x19
+ * -------------------------------------------------
+ */
func cortex_x1_reset_func
- ret
+ mov x19, x30
+ bl cpu_get_rev_var
+ mov x18, x0
+
+#if ERRATA_X1_1821534
+ mov x0, x18
+ bl errata_x1_1821534_wa
+#endif
+
+#if ERRATA_X1_1688305
+ mov x0, x18
+ bl errata_x1_1688305_wa
+#endif
+
+#if ERRATA_X1_1827429
+ mov x0, x18
+ bl errata_x1_1827429_wa
+#endif
+
+ isb
+ ret x19
endfunc cortex_x1_reset_func
/* ---------------------------------------------
@@ -43,6 +151,20 @@
* Errata printing function for Cortex X1. Must follow AAPCS.
*/
func cortex_x1_errata_report
+ stp x8, x30, [sp, #-16]!
+
+ bl cpu_get_rev_var
+ mov x8, x0
+
+ /*
+ * Report all errata. The revision-variant information is passed to
+ * checking functions of each errata.
+ */
+ report_errata ERRATA_X1_1821534, cortex_x1, 1821534
+ report_errata ERRATA_X1_1688305, cortex_x1, 1688305
+ report_errata ERRATA_X1_1827429, cortex_x1, 1827429
+
+ ldp x8, x30, [sp], #16
ret
endfunc cortex_x1_errata_report
#endif