[xen staging] xen/dt: Extract helper to map nodes to module kinds

[patchbot@xxxxxxx]

commit ae96841fff72fa22cd5707e94d48e99731af9e56
Author:     Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
AuthorDate: Tue Jul 22 02:05:20 2025 +0200
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Mon Jul 21 17:14:04 2025 -0700

    xen/dt: Extract helper to map nodes to module kinds
    
    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 <alejandro.garciavallejo@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 84520eed30..7c790b9a4d 100644
--- a/xen/common/device-tree/bootfdt.c
+++ b/xen/common/device-tree/bootfdt.c
@@ -5,6 +5,24 @@
 #include <xen/libfdt/libfdt.h>
 #include <xen/unaligned.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_POLICY;
+    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;
+}
+
 void __init device_tree_get_reg(const __be32 **cell, uint32_t address_cells,
                                 uint32_t size_cells, paddr_t *start,
                                 paddr_t *size)
diff --git a/xen/common/device-tree/bootinfo-fdt.c 
b/xen/common/device-tree/bootinfo-fdt.c
index 5111fc9436..2aa94b91a4 100644
--- a/xen/common/device-tree/bootinfo-fdt.c
+++ b/xen/common/device-tree/bootinfo-fdt.c
@@ -237,21 +237,7 @@ 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_POLICY;
-    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 5719bbfb93..6cf05b5cdd 100644
--- a/xen/include/xen/bootfdt.h
+++ b/xen/include/xen/bootfdt.h
@@ -157,4 +157,11 @@ 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 */
--
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