[PATCH v2 6/6] aarch64: Start Xen on Armv8-R at EL2

[Luca Fancellu]

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.

Signed-off-by: Luca Fancellu <luca.fancellu at arm.com>
---
v2 changes:
 - Don't write 1 on flag_keep_el since now the logic will jump to
   reset_no_el3 and write it there.
 - removed check for smc conduit when Xen is booted, change commit
   message.
---
 Makefile.am         | 1 +
 arch/aarch64/boot.S | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 34fbfb1f4ff8..bafce34682c3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -112,6 +112,7 @@ 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 2a8234f7a17d..38ed4ed48985 100644
--- a/arch/aarch64/boot.S
+++ b/arch/aarch64/boot.S
@@ -88,6 +88,7 @@ reset_at_el2:
 	cmp	x0, 0xf
 	bne	reset_no_el3
 
+#if !defined(XEN)
 	/*
 	 * Armv8-R AArch64 is found, check if Linux can be booted.
 	 * Check MSA_frac, bits [55:52]:
@@ -107,6 +108,7 @@ reset_at_el2:
 	mov	w0, #SPSR_KERNEL_EL1
 	ldr	x1, =spsr_to_elx
 	str	w0, [x1]
+#endif
 
 	bl	cpu_init_armv8r_el2
 
-- 
2.34.1