armv8: Support loading 32-bit OS in AArch32 execution state
To support loading a 32-bit OS, the execution state will change from
AArch64 to AArch32 when jumping to kernel.
The architecture information will be got through checking FIT image,
then U-Boot will load 32-bit OS or 64-bit OS automatically.
Signed-off-by: Ebony Zhu <ebony.zhu@nxp.com>
Signed-off-by: Alison Wang <alison.wang@nxp.com>
Signed-off-by: Chenhui Zhao <chenhui.zhao@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
index 19c771d..4f5f6d8 100644
--- a/arch/arm/cpu/armv8/start.S
+++ b/arch/arm/cpu/armv8/start.S
@@ -251,9 +251,17 @@
/*
* All slaves will enter EL2 and optionally EL1.
*/
+ adr x3, lowlevel_in_el2
+ ldr x4, =ES_TO_AARCH64
bl armv8_switch_to_el2
+
+lowlevel_in_el2:
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
+ adr x3, lowlevel_in_el1
+ ldr x4, =ES_TO_AARCH64
bl armv8_switch_to_el1
+
+lowlevel_in_el1:
#endif
#endif /* CONFIG_ARMV8_MULTIENTRY */