MdePkg: add FdtStrerror wrapper to BaseFdtLib

Add a wrapper for fdt_strerror () and add the currently supported error
code defines from submodule.

Signed-off-by: Leif Lindholm <quic_llindhol@quicinc.com>

MdePkg/Include/Library/FdtLib.h

@@ -19,6 +19,115 @@
 #ifndef FDT_LIB_H_
 #define FDT_LIB_H_
 
+/* Error codes: informative error codes */
+#define FDT_ERR_NOTFOUND  1
+/* FDT_ERR_NOTFOUND: The requested node or property does not exist */
+#define FDT_ERR_EXISTS  2
+
+/* FDT_ERR_EXISTS: Attempted to create a node or property which
+ * already exists */
+#define FDT_ERR_NOSPACE  3
+
+/* FDT_ERR_NOSPACE: Operation needed to expand the device
+ * tree, but its buffer did not have sufficient space to
+ * contain the expanded tree. Use fdt_open_into() to move the
+ * device tree to a buffer with more space. */
+
+/* Error codes: codes for bad parameters */
+#define FDT_ERR_BADOFFSET  4
+
+/* FDT_ERR_BADOFFSET: Function was passed a structure block
+ * offset which is out-of-bounds, or which points to an
+ * unsuitable part of the structure for the operation. */
+#define FDT_ERR_BADPATH  5
+
+/* FDT_ERR_BADPATH: Function was passed a badly formatted path
+ * (e.g. missing a leading / for a function which requires an
+ * absolute path) */
+#define FDT_ERR_BADPHANDLE  6
+
+/* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle.
+ * This can be caused either by an invalid phandle property
+ * length, or the phandle value was either 0 or -1, which are
+ * not permitted. */
+#define FDT_ERR_BADSTATE  7
+
+/* FDT_ERR_BADSTATE: Function was passed an incomplete device
+ * tree created by the sequential-write functions, which is
+ * not sufficiently complete for the requested operation. */
+
+/* Error codes: codes for bad device tree blobs */
+#define FDT_ERR_TRUNCATED  8
+
+/* FDT_ERR_TRUNCATED: FDT or a sub-block is improperly
+ * terminated (overflows, goes outside allowed bounds, or
+ * isn't properly terminated).  */
+#define FDT_ERR_BADMAGIC  9
+
+/* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a
+ * device tree at all - it is missing the flattened device
+ * tree magic number. */
+#define FDT_ERR_BADVERSION  10
+
+/* FDT_ERR_BADVERSION: Given device tree has a version which
+ * can't be handled by the requested operation.  For
+ * read-write functions, this may mean that fdt_open_into() is
+ * required to convert the tree to the expected version. */
+#define FDT_ERR_BADSTRUCTURE  11
+
+/* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt
+ * structure block or other serious error (e.g. misnested
+ * nodes, or subnodes preceding properties). */
+#define FDT_ERR_BADLAYOUT  12
+
+/* FDT_ERR_BADLAYOUT: For read-write functions, the given
+ * device tree has it's sub-blocks in an order that the
+ * function can't handle (memory reserve map, then structure,
+ * then strings).  Use fdt_open_into() to reorganize the tree
+ * into a form suitable for the read-write operations. */
+
+/* "Can't happen" error indicating a bug in libfdt */
+#define FDT_ERR_INTERNAL  13
+
+/* FDT_ERR_INTERNAL: libfdt has failed an internal assertion.
+ * Should never be returned, if it is, it indicates a bug in
+ * libfdt itself. */
+
+/* Errors in device tree content */
+#define FDT_ERR_BADNCELLS  14
+
+/* FDT_ERR_BADNCELLS: Device tree has a #address-cells, #size-cells
+ * or similar property with a bad format or value */
+
+#define FDT_ERR_BADVALUE  15
+
+/* FDT_ERR_BADVALUE: Device tree has a property with an unexpected
+ * value. For example: a property expected to contain a string list
+ * is not NUL-terminated within the length of its value. */
+
+#define FDT_ERR_BADOVERLAY  16
+
+/* FDT_ERR_BADOVERLAY: The device tree overlay, while
+ * correctly structured, cannot be applied due to some
+ * unexpected or missing value, property or node. */
+
+#define FDT_ERR_NOPHANDLES  17
+
+/* FDT_ERR_NOPHANDLES: The device tree doesn't have any
+ * phandle available anymore without causing an overflow */
+
+#define FDT_ERR_BADFLAGS  18
+
+/* FDT_ERR_BADFLAGS: The function was passed a flags field that
+ * contains invalid flags or an invalid combination of flags. */
+
+#define FDT_ERR_ALIGNMENT  19
+
+/* FDT_ERR_ALIGNMENT: The device tree base address is not 8-byte
+ * aligned. */
+
+#define FDT_ERR_MAX  19
+
 /**
   Flattened Device Tree definition
 
@@ -483,4 +592,12 @@ FdtNodeOffsetByCompatible (
   IN CONST CHAR8  *Compatible
   );
 
+/* Debug functions. */
+CONST
+CHAR8
+*
+FdtStrerror (
+  IN INT32  ErrVal
+  );
+
 #endif /* FDT_LIB_H_ */

MdePkg/Library/BaseFdtLib/FdtLib.c

@@ -503,3 +503,14 @@ FdtNodeOffsetByCompatible (
 {
   return fdt_node_offset_by_compatible (Fdt, StartOffset, Compatible);
 }
+
+/* Debug functions. */
+CONST
+CHAR8
+*
+FdtStrerror (
+  IN INT32  ErrVal
+  )
+{
+  return fdt_strerror (ErrVal);
+}