[PATCH v4 09/12] xen/dt: Extract helper to map nodes to module kinds

[Alejandro Vallejo <agarciav@xxxxxxx>]

This will be required later by x86 code in order to do early identification
of boot modules when booting off a DTB.

Not a functional change.

Signed-off-by: Alejandro Vallejo <agarciav@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/common/device-tree/bootfdt.c      | 18 ++++++++++++++++++
 xen/common/device-tree/bootinfo-fdt.c | 16 +---------------
 xen/include/xen/bootfdt.h             |  7 +++++++
 3 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/xen/common/device-tree/bootfdt.c b/xen/common/device-tree/bootfdt.c
index 0d8d9ea357..8218c0a10b 100644
--- a/xen/common/device-tree/bootfdt.c
+++ b/xen/common/device-tree/bootfdt.c
@@ -4,6 +4,24 @@
 #include <xen/lib.h>
 #include <xen/libfdt/libfdt.h>
 
+boot_module_kind __init fdt_node_to_kind(const void *fdt, int node)
+{
+    if ( fdt_node_check_compatible(fdt, node, "xen,linux-zimage") == 0 ||
+         fdt_node_check_compatible(fdt, node, "multiboot,kernel") == 0 )
+        return BOOTMOD_KERNEL;
+    if ( fdt_node_check_compatible(fdt, node, "xen,linux-initrd") == 0 ||
+         fdt_node_check_compatible(fdt, node, "multiboot,ramdisk") == 0 )
+        return BOOTMOD_RAMDISK;
+    if ( fdt_node_check_compatible(fdt, node, "xen,xsm-policy") == 0 )
+        return BOOTMOD_XSM;
+    if ( fdt_node_check_compatible(fdt, node, "multiboot,device-tree") == 0 )
+        return BOOTMOD_GUEST_DTB;
+    if ( fdt_node_check_compatible(fdt, node, "multiboot,microcode") == 0 )
+        return BOOTMOD_MICROCODE;
+
+    return BOOTMOD_UNKNOWN;
+}
+
 u32 __init device_tree_get_u32(const void *fdt, int node,
                                const char *prop_name, u32 dflt)
 {
diff --git a/xen/common/device-tree/bootinfo-fdt.c 
b/xen/common/device-tree/bootinfo-fdt.c
index 16036472f3..9b426c0a98 100644
--- a/xen/common/device-tree/bootinfo-fdt.c
+++ b/xen/common/device-tree/bootinfo-fdt.c
@@ -236,21 +236,7 @@ static void __init process_multiboot_node(const void *fdt, 
int node,
 
     cell = (const __be32 *)prop->data;
     device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
-
-    if ( fdt_node_check_compatible(fdt, node, "xen,linux-zimage") == 0 ||
-         fdt_node_check_compatible(fdt, node, "multiboot,kernel") == 0 )
-        kind = BOOTMOD_KERNEL;
-    else if ( fdt_node_check_compatible(fdt, node, "xen,linux-initrd") == 0 ||
-              fdt_node_check_compatible(fdt, node, "multiboot,ramdisk") == 0 )
-        kind = BOOTMOD_RAMDISK;
-    else if ( fdt_node_check_compatible(fdt, node, "xen,xsm-policy") == 0 )
-        kind = BOOTMOD_XSM;
-    else if ( fdt_node_check_compatible(fdt, node, "multiboot,device-tree") == 
0 )
-        kind = BOOTMOD_GUEST_DTB;
-    else if ( fdt_node_check_compatible(fdt, node, "multiboot,microcode") == 0 
)
-        kind = BOOTMOD_MICROCODE;
-    else
-        kind = BOOTMOD_UNKNOWN;
+    kind = fdt_node_to_kind(fdt, node);
 
     /**
      * Guess the kind of these first two unknowns respectively:
diff --git a/xen/include/xen/bootfdt.h b/xen/include/xen/bootfdt.h
index ad6b11cb6d..bc5fc995b0 100644
--- a/xen/include/xen/bootfdt.h
+++ b/xen/include/xen/bootfdt.h
@@ -143,4 +143,11 @@ u32 device_tree_get_u32(const void *fdt, int node,
 void device_tree_get_reg(const __be32 **cell, uint32_t address_cells,
                          uint32_t size_cells, paddr_t *start, paddr_t *size);
 
+/*
+ * Probe an FDT node thought to be a boot module to identify its kind.
+ *
+ * If correctly identified, returns the detected kind, otherwise 
BOOTMOD_UNKNOWN
+ */
+boot_module_kind fdt_node_to_kind(const void *fdt, int node);
+
 #endif /* XEN_BOOTFDT_H */
-- 
2.43.0