[boot-wrapper v3 4/4] aarch64: Start Xen on Armv8-R at EL2

[Luca Fancellu <luca.fancellu@arm.com>]

When bootwrapper is compiled with Xen support and it is started
at EL2 on Armv8-R AArch64, keep the current EL and jump to the
Xen image using the SPSR_KERNEL as spsr_el2 value.

Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
Changes from v2:
 - Major rework, reason in the cover letter.
---
 Makefile.am         | 1 +
 arch/aarch64/boot.S | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 62e2988c0dd3..0aee117eb827 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -113,6 +113,7 @@ XEN_CHOSEN	:= xen,xen-bootargs = \"$(XEN_CMDLINE)\";		\
 			compatible = \"xen,linux-zimage\", \"xen,multiboot-module\"; \
 			reg = <0x0 $(DOM0_OFFSET) 0x0 $(KERNEL_SIZE)>;	\
 		   };
+DEFINES		+= -DXEN
 endif
 
 if INITRD
diff --git a/arch/aarch64/boot.S b/arch/aarch64/boot.S
index 0b4f6824045a..d50ff48d83de 100644
--- a/arch/aarch64/boot.S
+++ b/arch/aarch64/boot.S
@@ -100,7 +100,7 @@ ASM_FUNC(jump_kernel)
 	mov	x1, x21
 	mov	x2, x22
 	mov	x3, x23
-#if defined(BOOTWRAPPER_64R)
+#if defined(BOOTWRAPPER_64R) && !defined(XEN)
 	// On Armv8-R Linux needs to be booted at EL1
 	mov	x4, #SPSR_KERNEL_EL1
 #else
-- 
2.34.1