x86: Add 64-bit start-up code
Add code to start up U-Boot in 64-bit mode. It is fairly simple since we are
running from RAM and SPL has done the low-level init.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index dd0e22f..4be1c35 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -3,8 +3,13 @@
#
ifeq ($(CONFIG_EFI_APP),)
+ifdef CONFIG_$(SPL_)X86_64
+head-y := arch/x86/cpu/start64.o
+else
head-y := arch/x86/cpu/start.o
endif
+endif
+
head-$(CONFIG_$(SPL_)X86_16BIT_INIT) += arch/x86/cpu/start16.o
head-$(CONFIG_$(SPL_)X86_16BIT_INIT) += arch/x86/cpu/resetvec.o