[PATCH v2 03/10] xen/arm: add CONFIG_ARM_EFI to stub EFI API

[Wei Chen <wei.chen@xxxxxxx>]

x86 is using compiler feature testing to decide EFI
build enable or not. When EFI build is disabled, x86
will use a efi/stub.c file to replace efi/runtime.c
for build objects. Following this idea, we introduce
a stub file for Arm, but use CONFIG_ARM_EFI to decide
EFI build enable or not.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
---
v1 -> v2:
1. Use CONFIG_ARM_EFI to replace CONFIG_EFI
2. Remove help text and make CONFIG_ARM_EFI invisible.
3. Merge one following patch:
   xen/arm: introduce a stub file for non-EFI architectures
4. Use the common stub.c instead of creating new one.
---
 xen/arch/arm/Kconfig      | 5 +++++
 xen/arch/arm/Makefile     | 2 +-
 xen/arch/arm/efi/Makefile | 5 +++++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index ecfa6822e4..5f1b0121b0 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -6,6 +6,7 @@ config ARM_64
        def_bool y
        depends on !ARM_32
        select 64BIT
+       select ARM_EFI
        select HAS_FAST_MULTIPLY
 
 config ARM
@@ -33,6 +34,10 @@ config ACPI
          Advanced Configuration and Power Interface (ACPI) support for Xen is
          an alternative to device tree on ARM64.
 
+config ARM_EFI
+       bool
+       depends on ARM_64
+
 config GICV3
        bool "GICv3 driver"
        depends on ARM_64 && !NEW_VGIC
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 1d862351d1..bb7a6151c1 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -1,6 +1,5 @@
 obj-$(CONFIG_ARM_32) += arm32/
 obj-$(CONFIG_ARM_64) += arm64/
-obj-$(CONFIG_ARM_64) += efi/
 obj-$(CONFIG_ACPI) += acpi/
 obj-$(CONFIG_HAS_PCI) += pci/
 ifneq ($(CONFIG_NO_PLAT),y)
@@ -20,6 +19,7 @@ obj-y += domain.o
 obj-y += domain_build.init.o
 obj-y += domctl.o
 obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+obj-y += efi/
 obj-y += gic.o
 obj-y += gic-v2.o
 obj-$(CONFIG_GICV3) += gic-v3.o
diff --git a/xen/arch/arm/efi/Makefile b/xen/arch/arm/efi/Makefile
index 4313c39066..75ef180233 100644
--- a/xen/arch/arm/efi/Makefile
+++ b/xen/arch/arm/efi/Makefile
@@ -1,4 +1,9 @@
 include $(srctree)/common/efi/efi-common.mk
 
+ifeq ($(CONFIG_ARM_EFI),y)
 obj-y += $(EFIOBJ-y)
 obj-$(CONFIG_ACPI) +=  efi-dom0.init.o
+else
+EFIOBJ-y += stub.o
+obj-y += stub.o
+endif
-- 
2.25.1