1 # SPDX-License-Identifier: GPL-2.0+
2 # Copyright (c) 2016 Google, Inc
4 # Base class for all entries
7 from __future__ import print_function
9 from collections import namedtuple
11 # importlib was introduced in Python 2.7 but there was a report of it not
12 # working in 2.7.12, so we work around this:
13 # http://lists.denx.de/pipermail/u-boot/2016-October/269729.html
18 have_importlib = False
30 our_path = os.path.dirname(os.path.realpath(__file__))
33 # An argument which can be passed to entries on the command line, in lieu of
34 # device-tree properties.
35 EntryArg = namedtuple('EntryArg', ['name', 'datatype'])
39 """An Entry in the section
41 An entry corresponds to a single node in the device-tree description
42 of the section. Each entry ends up being a part of the final section.
43 Entries can be placed either right next to each other, or with padding
44 between them. The type of the entry determines the data that is in it.
46 This class is not used by itself. All entry objects are subclasses of
50 section: Section object containing this entry
51 node: The node that created this entry
52 offset: Offset of entry within the section, None if not known yet (in
53 which case it will be calculated by Pack())
54 size: Entry size in bytes, None if not known
55 contents_size: Size of contents in bytes, 0 by default
56 align: Entry start offset alignment, or None
57 align_size: Entry size alignment, or None
58 align_end: Entry end offset alignment, or None
59 pad_before: Number of pad bytes before the contents, 0 if none
60 pad_after: Number of pad bytes after the contents, 0 if none
61 data: Contents of entry (string of bytes)
63 def __init__(self, section, etype, node, read_node=True, name_prefix=''):
64 self.section = section
67 self.name = node and (name_prefix + node.name) or 'none'
71 self.contents_size = 0
73 self.align_size = None
77 self.offset_unset = False
83 def Lookup(section, node_path, etype):
84 """Look up the entry class for a node.
87 section: Section object containing this node
88 node_node: Path name of Node object containing information about
89 the entry to create (used for errors)
90 etype: Entry type to use
93 The entry class object if found, else None
95 # Convert something like 'u-boot@0' to 'u_boot' since we are only
96 # interested in the type.
97 module_name = etype.replace('-', '_')
98 if '@' in module_name:
99 module_name = module_name.split('@')[0]
100 module = modules.get(module_name)
102 # Also allow entry-type modules to be brought in from the etype directory.
104 # Import the module if we have not already done so.
107 sys.path.insert(0, os.path.join(our_path, 'etype'))
110 module = importlib.import_module(module_name)
112 module = __import__(module_name)
113 except ImportError as e:
114 raise ValueError("Unknown entry type '%s' in node '%s' (expected etype/%s.py, error '%s'" %
115 (etype, node_path, module_name, e))
118 modules[module_name] = module
120 # Look up the expected class name
121 return getattr(module, 'Entry_%s' % module_name)
124 def Create(section, node, etype=None):
125 """Create a new entry for a node.
128 section: Section object containing this node
129 node: Node object containing information about the entry to
131 etype: Entry type to use, or None to work it out (used for tests)
134 A new Entry object of the correct type (a subclass of Entry)
137 etype = fdt_util.GetString(node, 'type', node.name)
138 obj = Entry.Lookup(section, node.path, etype)
140 # Call its constructor to get the object we want.
141 return obj(section, etype, node)
144 """Read entry information from the node
146 This reads all the fields we recognise from the node, ready for use.
148 if 'pos' in self._node.props:
149 self.Raise("Please use 'offset' instead of 'pos'")
150 self.offset = fdt_util.GetInt(self._node, 'offset')
151 self.size = fdt_util.GetInt(self._node, 'size')
152 self.align = fdt_util.GetInt(self._node, 'align')
153 if tools.NotPowerOfTwo(self.align):
154 raise ValueError("Node '%s': Alignment %s must be a power of two" %
155 (self._node.path, self.align))
156 self.pad_before = fdt_util.GetInt(self._node, 'pad-before', 0)
157 self.pad_after = fdt_util.GetInt(self._node, 'pad-after', 0)
158 self.align_size = fdt_util.GetInt(self._node, 'align-size')
159 if tools.NotPowerOfTwo(self.align_size):
160 raise ValueError("Node '%s': Alignment size %s must be a power "
161 "of two" % (self._node.path, self.align_size))
162 self.align_end = fdt_util.GetInt(self._node, 'align-end')
163 self.offset_unset = fdt_util.GetBool(self._node, 'offset-unset')
165 def GetDefaultFilename(self):
169 """Get the set of device trees used by this entry
172 Set containing the filename from this entry, if it is a .dtb, else
175 fname = self.GetDefaultFilename()
176 # It would be better to use isinstance(self, Entry_blob_dtb) here but
177 # we cannot access Entry_blob_dtb
178 if fname and fname.endswith('.dtb'):
182 def AddMissingProperties(self):
183 """Add new properties to the device tree as needed for this entry"""
184 for prop in ['offset', 'size', 'image-pos']:
185 if not prop in self._node.props:
186 state.AddZeroProp(self._node, prop)
188 def SetCalculatedProperties(self):
189 """Set the value of device-tree properties calculated by binman"""
190 state.SetInt(self._node, 'offset', self.offset)
191 state.SetInt(self._node, 'size', self.size)
192 state.SetInt(self._node, 'image-pos', self.image_pos)
194 def ProcessFdt(self, fdt):
197 def SetPrefix(self, prefix):
198 """Set the name prefix for a node
201 prefix: Prefix to set, or '' to not use a prefix
204 self.name = prefix + self.name
206 def SetContents(self, data):
207 """Set the contents of an entry
209 This sets both the data and content_size properties
212 data: Data to set to the contents (string)
215 self.contents_size = len(self.data)
217 def ProcessContentsUpdate(self, data):
218 """Update the contens of an entry, after the size is fixed
220 This checks that the new data is the same size as the old.
223 data: Data to set to the contents (string)
226 ValueError if the new data size is not the same as the old
228 if len(data) != self.contents_size:
229 self.Raise('Cannot update entry size from %d to %d' %
230 (len(data), self.contents_size))
231 self.SetContents(data)
233 def ObtainContents(self):
234 """Figure out the contents of an entry.
237 True if the contents were found, False if another call is needed
238 after the other entries are processed.
240 # No contents by default: subclasses can implement this
243 def Pack(self, offset):
244 """Figure out how to pack the entry into the section
246 Most of the time the entries are not fully specified. There may be
247 an alignment but no size. In that case we take the size from the
248 contents of the entry.
250 If an entry has no hard-coded offset, it will be placed at @offset.
252 Once this function is complete, both the offset and size of the
256 Current section offset pointer
259 New section offset pointer (after this entry)
261 if self.offset is None:
262 if self.offset_unset:
263 self.Raise('No offset set with offset-unset: should another '
264 'entry provide this correct offset?')
265 self.offset = tools.Align(offset, self.align)
266 needed = self.pad_before + self.contents_size + self.pad_after
267 needed = tools.Align(needed, self.align_size)
271 new_offset = self.offset + size
272 aligned_offset = tools.Align(new_offset, self.align_end)
273 if aligned_offset != new_offset:
274 size = aligned_offset - self.offset
275 new_offset = aligned_offset
280 if self.size < needed:
281 self.Raise("Entry contents size is %#x (%d) but entry size is "
282 "%#x (%d)" % (needed, needed, self.size, self.size))
283 # Check that the alignment is correct. It could be wrong if the
284 # and offset or size values were provided (i.e. not calculated), but
285 # conflict with the provided alignment values
286 if self.size != tools.Align(self.size, self.align_size):
287 self.Raise("Size %#x (%d) does not match align-size %#x (%d)" %
288 (self.size, self.size, self.align_size, self.align_size))
289 if self.offset != tools.Align(self.offset, self.align):
290 self.Raise("Offset %#x (%d) does not match align %#x (%d)" %
291 (self.offset, self.offset, self.align, self.align))
295 def Raise(self, msg):
296 """Convenience function to raise an error referencing a node"""
297 raise ValueError("Node '%s': %s" % (self._node.path, msg))
299 def GetEntryArgsOrProps(self, props, required=False):
300 """Return the values of a set of properties
303 props: List of EntryArg objects
306 ValueError if a property is not found
311 python_prop = prop.name.replace('-', '_')
312 if hasattr(self, python_prop):
313 value = getattr(self, python_prop)
317 value = self.GetArg(prop.name, prop.datatype)
318 if value is None and required:
319 missing.append(prop.name)
322 self.Raise('Missing required properties/entry args: %s' %
323 (', '.join(missing)))
327 """Get the path of a node
330 Full path of the node for this entry
332 return self._node.path
337 def GetOffsets(self):
340 def SetOffsetSize(self, pos, size):
344 def SetImagePos(self, image_pos):
345 """Set the position in the image
348 image_pos: Position of this entry in the image
350 self.image_pos = image_pos + self.offset
352 def ProcessContents(self):
355 def WriteSymbols(self, section):
356 """Write symbol values into binary files for access at run time
359 section: Section containing the entry
363 def CheckOffset(self):
364 """Check that the entry offsets are correct
366 This is used for entries which have extra offset requirements (other
367 than having to be fully inside their section). Sub-classes can implement
368 this function and raise if there is a problem.
373 def WriteMapLine(fd, indent, name, offset, size, image_pos):
374 print('%08x %s%08x %08x %s' % (image_pos, ' ' * indent, offset,
375 size, name), file=fd)
377 def WriteMap(self, fd, indent):
378 """Write a map of the entry to a .map file
381 fd: File to write the map to
382 indent: Curent indent level of map (0=none, 1=one level, etc.)
384 self.WriteMapLine(fd, indent, self.name, self.offset, self.size,
387 def GetEntries(self):
388 """Return a list of entries contained by this entry
391 List of entries, or None if none. A normal entry has no entries
392 within it so will return None
396 def GetArg(self, name, datatype=str):
397 """Get the value of an entry argument or device-tree-node property
399 Some node properties can be provided as arguments to binman. First check
400 the entry arguments, and fall back to the device tree if not found
404 datatype: Data type (str or int)
407 Value of argument as a string or int, or None if no value
410 ValueError if the argument cannot be converted to in
412 value = state.GetEntryArg(name)
413 if value is not None:
418 self.Raise("Cannot convert entry arg '%s' (value '%s') to integer" %
420 elif datatype == str:
423 raise ValueError("GetArg() internal error: Unknown data type '%s'" %
426 value = fdt_util.GetDatatype(self._node, name, datatype)
430 def WriteDocs(modules, test_missing=None):
431 """Write out documentation about the various entry types to stdout
434 modules: List of modules to include
435 test_missing: Used for testing. This is a module to report
438 print('''Binman Entry Documentation
439 ===========================
441 This file describes the entry types supported by binman. These entry types can
442 be placed in an image one by one to build up a final firmware image. It is
443 fairly easy to create new entry types. Just add a new file to the 'etype'
444 directory. You can use the existing entries as examples.
446 Note that some entries are subclasses of others, using and extending their
447 features to produce new behaviours.
451 modules = sorted(modules)
453 # Don't show the test entry
454 if '_testing' in modules:
455 modules.remove('_testing')
458 module = Entry.Lookup(name, name, name)
459 docs = getattr(module, '__doc__')
460 if test_missing == name:
463 lines = docs.splitlines()
464 first_line = lines[0]
465 rest = [line[4:] for line in lines[1:]]
466 hdr = 'Entry: %s: %s' % (name.replace('_', '-'), first_line)
468 print('-' * len(hdr))
469 print('\n'.join(rest))
476 raise ValueError('Documentation is missing for modules: %s' %
479 def GetUniqueName(self):
480 """Get a unique name for a node
483 String containing a unique name for a node, consisting of the name
484 of all ancestors (starting from within the 'binman' node) separated
485 by a dot ('.'). This can be useful for generating unique filesnames
486 in the output directory.
492 if node.name == 'binman':
494 name = '%s.%s' % (node.name, name)