Errata/ARM57: Add basic constructs to handle and apply A57 specific erratas
This patch adds basic constructs in the ARMv8 u-boot code
to handle and apply Cortex-A57 specific erratas.
As and example, the framework showcases how erratas 833069, 826974
and 828024 can be handled and applied.
Later on this framework can be extended to include other
erratas.
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@freescale.com>
diff --git a/arch/arm/include/asm/macro.h b/arch/arm/include/asm/macro.h
index 1c8c425..5f7c7e0 100644
--- a/arch/arm/include/asm/macro.h
+++ b/arch/arm/include/asm/macro.h
@@ -74,6 +74,28 @@
.endm
/*
+ * Branch if current processor is a Cortex-A57 core.
+ */
+.macro branch_if_a57_core, xreg, a57_label
+ mrs \xreg, midr_el1
+ lsr \xreg, \xreg, #4
+ and \xreg, \xreg, #0x00000FFF
+ cmp \xreg, #0xD07 /* Cortex-A57 MPCore processor. */
+ b.eq \a57_label
+.endm
+
+/*
+ * Branch if current processor is a Cortex-A53 core.
+ */
+.macro branch_if_a53_core, xreg, a53_label
+ mrs \xreg, midr_el1
+ lsr \xreg, \xreg, #4
+ and \xreg, \xreg, #0x00000FFF
+ cmp \xreg, #0xD03 /* Cortex-A53 MPCore processor. */
+ b.eq \a53_label
+.endm
+
+/*
* Branch if current processor is a slave,
* choose processor with all zero affinity value as the master.
*/