[PATCH v2 3/7] xen/common: Move Arm's bootfdt to common

[Shawn Anastasio <sanastasio@raptorengineering.com>]

Move Arm's bootfdt.c to xen/common so that it can be used by other
device tree architectures like PPC and RISCV. Only a minor change to
conditionalize a call to a function only available on EFI-supporting
targets was made to the code itself.

Suggested-by: Julien Grall <julien@xen.org>
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
---
 xen/arch/arm/Makefile                          |  1 -
 xen/common/Makefile                            |  1 +
 xen/common/device-tree/Makefile                |  1 +
 xen/{arch/arm => common/device-tree}/bootfdt.c | 15 +++++++++------
 4 files changed, 11 insertions(+), 7 deletions(-)
 create mode 100644 xen/common/device-tree/Makefile
 rename xen/{arch/arm => common/device-tree}/bootfdt.c (98%)

diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 33c677672f..64fdf84170 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -10,7 +10,6 @@ obj-$(CONFIG_TEE) += tee/
 obj-$(CONFIG_HAS_VPCI) += vpci.o
 
 obj-$(CONFIG_HAS_ALTERNATIVE) += alternative.o
-obj-y += bootfdt.init.o
 obj-y += cpuerrata.o
 obj-y += cpufeature.o
 obj-y += decode.o
diff --git a/xen/common/Makefile b/xen/common/Makefile
index 69d6aa626c..6e175626d5 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -77,6 +77,7 @@ obj-$(CONFIG_UBSAN) += ubsan/
 
 obj-$(CONFIG_NEEDS_LIBELF) += libelf/
 obj-$(CONFIG_HAS_DEVICE_TREE) += libfdt/
+obj-$(CONFIG_HAS_DEVICE_TREE) += device-tree/
 
 CONF_FILE := $(if $(patsubst /%,,$(KCONFIG_CONFIG)),$(objtree)/)$(KCONFIG_CONFIG)
 $(obj)/config.gz: $(CONF_FILE)
diff --git a/xen/common/device-tree/Makefile b/xen/common/device-tree/Makefile
new file mode 100644
index 0000000000..66c2500df9
--- /dev/null
+++ b/xen/common/device-tree/Makefile
@@ -0,0 +1 @@
+obj-y += bootfdt.init.o
diff --git a/xen/arch/arm/bootfdt.c b/xen/common/device-tree/bootfdt.c
similarity index 98%
rename from xen/arch/arm/bootfdt.c
rename to xen/common/device-tree/bootfdt.c
index f496a8cf94..ae9fa1e3d6 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/common/device-tree/bootfdt.c
@@ -431,12 +431,15 @@ static int __init early_scan_node(const void *fdt,
 {
     int rc = 0;
 
-    /*
-     * If Xen has been booted via UEFI, the memory banks are
-     * populated. So we should skip the parsing.
-     */
-    if ( !efi_enabled(EFI_BOOT) &&
-         device_tree_node_matches(fdt, node, "memory") )
+    if ( device_tree_node_matches(fdt, node, "memory") )
+#if defined(CONFIG_ARM_EFI)
+        /*
+         * If Xen has been booted via UEFI, the memory banks are
+         * populated. So we should skip the parsing.
+         */
+        if ( efi_enabled(EFI_BOOT) )
+            return rc;
+#endif
         rc = process_memory_node(fdt, node, name, depth,
                                  address_cells, size_cells, &bootinfo.mem);
     else if ( depth == 1 && !dt_node_cmp(name, "reserved-memory") )
-- 
2.30.2