commit 96a8d409a75af99ac7a9a9ba707d544f9cf44fc0
author Simon Glass <sjg@chromium.org> Tue Aug 04 12:33:56 2015 -0600
committer Simon Glass <sjg@chromium.org> Wed Aug 05 08:44:07 2015 -0600
tree 42d2df0ab57c55ce9f0a191b97fb88a7858b81ff
parent 6f92ed8f1abfe94ee1c96c83c21f4092bb04ff63

efi: Add 64-bit payload support

Most EFI implementations use 64-bit. Add a way to build U-Boot as a 64-bit
EFI payload. The payload unpacks a (32-bit) U-Boot and starts it. This can
be enabled for x86 boards at present.

Signed-off-by: Simon Glass <sjg@chromium.org>
Improvements to how the payload is built:
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/config.mk

diff --git a/arch/x86/config.mk b/arch/x86/config.mk
index 334c10b..d7addd8 100644
--- a/arch/x86/config.mk
+++ b/arch/x86/config.mk
@@ -34,14 +34,24 @@
 CFLAGS_NON_EFI := -mregparm=3
 CFLAGS_EFI := -fpic -fshort-wchar
 
+ifeq ($(CONFIG_EFI_STUB_64BIT),)
+CFLAGS_EFI += $(call cc-option, -mno-red-zone)
 EFIARCH = ia32
 EFIPAYLOAD_BFDTARGET = elf32-i386
+else
+EFIARCH = x86_64
+EFIPAYLOAD_BFDTARGET = elf64-x86-64
+endif
 
 EFIPAYLOAD_BFDARCH = i386
 
 LDSCRIPT_EFI := $(srctree)/$(CPUDIR)/efi/elf_$(EFIARCH)_efi.lds
+EFISTUB := crt0-efi-$(EFIARCH).o reloc_$(EFIARCH).o
 OBJCOPYFLAGS_EFI += --target=efi-app-$(EFIARCH)
 
+CPPFLAGS_REMOVE_crt0-efi-$(EFIARCH).o += $(CFLAGS_NON_EFI)
+CPPFLAGS_crt0-efi-$(EFIARCH).o += $(CFLAGS_EFI)
+
 ifeq ($(CONFIG_EFI_APP),y)
 
 PLATFORM_CPPFLAGS += $(CFLAGS_EFI)