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
79 self._expand_size = False
84 def Lookup(section, node_path, etype):
85 """Look up the entry class for a node.
88 section: Section object containing this node
89 node_node: Path name of Node object containing information about
90 the entry to create (used for errors)
91 etype: Entry type to use
94 The entry class object if found, else None
96 # Convert something like 'u-boot@0' to 'u_boot' since we are only
97 # interested in the type.
98 module_name = etype.replace('-', '_')
99 if '@' in module_name:
100 module_name = module_name.split('@')[0]
101 module = modules.get(module_name)
103 # Also allow entry-type modules to be brought in from the etype directory.
105 # Import the module if we have not already done so.
108 sys.path.insert(0, os.path.join(our_path, 'etype'))
111 module = importlib.import_module(module_name)
113 module = __import__(module_name)
114 except ImportError as e:
115 raise ValueError("Unknown entry type '%s' in node '%s' (expected etype/%s.py, error '%s'" %
116 (etype, node_path, module_name, e))
119 modules[module_name] = module
121 # Look up the expected class name
122 return getattr(module, 'Entry_%s' % module_name)
125 def Create(section, node, etype=None):
126 """Create a new entry for a node.
129 section: Section object containing this node
130 node: Node object containing information about the entry to
132 etype: Entry type to use, or None to work it out (used for tests)
135 A new Entry object of the correct type (a subclass of Entry)
138 etype = fdt_util.GetString(node, 'type', node.name)
139 obj = Entry.Lookup(section, node.path, etype)
141 # Call its constructor to get the object we want.
142 return obj(section, etype, node)
145 """Read entry information from the node
147 This reads all the fields we recognise from the node, ready for use.
149 if 'pos' in self._node.props:
150 self.Raise("Please use 'offset' instead of 'pos'")
151 self.offset = fdt_util.GetInt(self._node, 'offset')
152 self.size = fdt_util.GetInt(self._node, 'size')
153 self.align = fdt_util.GetInt(self._node, 'align')
154 if tools.NotPowerOfTwo(self.align):
155 raise ValueError("Node '%s': Alignment %s must be a power of two" %
156 (self._node.path, self.align))
157 self.pad_before = fdt_util.GetInt(self._node, 'pad-before', 0)
158 self.pad_after = fdt_util.GetInt(self._node, 'pad-after', 0)
159 self.align_size = fdt_util.GetInt(self._node, 'align-size')
160 if tools.NotPowerOfTwo(self.align_size):
161 raise ValueError("Node '%s': Alignment size %s must be a power "
162 "of two" % (self._node.path, self.align_size))
163 self.align_end = fdt_util.GetInt(self._node, 'align-end')
164 self.offset_unset = fdt_util.GetBool(self._node, 'offset-unset')
165 self.expand_size = fdt_util.GetBool(self._node, 'expand-size')
167 def GetDefaultFilename(self):
171 """Get the set of device trees used by this entry
174 Set containing the filename from this entry, if it is a .dtb, else
177 fname = self.GetDefaultFilename()
178 # It would be better to use isinstance(self, Entry_blob_dtb) here but
179 # we cannot access Entry_blob_dtb
180 if fname and fname.endswith('.dtb'):
184 def ExpandEntries(self):
187 def AddMissingProperties(self):
188 """Add new properties to the device tree as needed for this entry"""
189 for prop in ['offset', 'size', 'image-pos']:
190 if not prop in self._node.props:
191 state.AddZeroProp(self._node, prop)
192 err = state.CheckAddHashProp(self._node)
196 def SetCalculatedProperties(self):
197 """Set the value of device-tree properties calculated by binman"""
198 state.SetInt(self._node, 'offset', self.offset)
199 state.SetInt(self._node, 'size', self.size)
200 state.SetInt(self._node, 'image-pos', self.image_pos)
201 state.CheckSetHashValue(self._node, self.GetData)
203 def ProcessFdt(self, fdt):
204 """Allow entries to adjust the device tree
206 Some entries need to adjust the device tree for their purposes. This
207 may involve adding or deleting properties.
210 True if processing is complete
211 False if processing could not be completed due to a dependency.
212 This will cause the entry to be retried after others have been
217 def SetPrefix(self, prefix):
218 """Set the name prefix for a node
221 prefix: Prefix to set, or '' to not use a prefix
224 self.name = prefix + self.name
226 def SetContents(self, data):
227 """Set the contents of an entry
229 This sets both the data and content_size properties
232 data: Data to set to the contents (string)
235 self.contents_size = len(self.data)
237 def ProcessContentsUpdate(self, data):
238 """Update the contens of an entry, after the size is fixed
240 This checks that the new data is the same size as the old.
243 data: Data to set to the contents (string)
246 ValueError if the new data size is not the same as the old
248 if len(data) != self.contents_size:
249 self.Raise('Cannot update entry size from %d to %d' %
250 (len(data), self.contents_size))
251 self.SetContents(data)
253 def ObtainContents(self):
254 """Figure out the contents of an entry.
257 True if the contents were found, False if another call is needed
258 after the other entries are processed.
260 # No contents by default: subclasses can implement this
263 def Pack(self, offset):
264 """Figure out how to pack the entry into the section
266 Most of the time the entries are not fully specified. There may be
267 an alignment but no size. In that case we take the size from the
268 contents of the entry.
270 If an entry has no hard-coded offset, it will be placed at @offset.
272 Once this function is complete, both the offset and size of the
276 Current section offset pointer
279 New section offset pointer (after this entry)
281 if self.offset is None:
282 if self.offset_unset:
283 self.Raise('No offset set with offset-unset: should another '
284 'entry provide this correct offset?')
285 self.offset = tools.Align(offset, self.align)
286 needed = self.pad_before + self.contents_size + self.pad_after
287 needed = tools.Align(needed, self.align_size)
291 new_offset = self.offset + size
292 aligned_offset = tools.Align(new_offset, self.align_end)
293 if aligned_offset != new_offset:
294 size = aligned_offset - self.offset
295 new_offset = aligned_offset
300 if self.size < needed:
301 self.Raise("Entry contents size is %#x (%d) but entry size is "
302 "%#x (%d)" % (needed, needed, self.size, self.size))
303 # Check that the alignment is correct. It could be wrong if the
304 # and offset or size values were provided (i.e. not calculated), but
305 # conflict with the provided alignment values
306 if self.size != tools.Align(self.size, self.align_size):
307 self.Raise("Size %#x (%d) does not match align-size %#x (%d)" %
308 (self.size, self.size, self.align_size, self.align_size))
309 if self.offset != tools.Align(self.offset, self.align):
310 self.Raise("Offset %#x (%d) does not match align %#x (%d)" %
311 (self.offset, self.offset, self.align, self.align))
315 def Raise(self, msg):
316 """Convenience function to raise an error referencing a node"""
317 raise ValueError("Node '%s': %s" % (self._node.path, msg))
319 def GetEntryArgsOrProps(self, props, required=False):
320 """Return the values of a set of properties
323 props: List of EntryArg objects
326 ValueError if a property is not found
331 python_prop = prop.name.replace('-', '_')
332 if hasattr(self, python_prop):
333 value = getattr(self, python_prop)
337 value = self.GetArg(prop.name, prop.datatype)
338 if value is None and required:
339 missing.append(prop.name)
342 self.Raise('Missing required properties/entry args: %s' %
343 (', '.join(missing)))
347 """Get the path of a node
350 Full path of the node for this entry
352 return self._node.path
357 def GetOffsets(self):
360 def SetOffsetSize(self, pos, size):
364 def SetImagePos(self, image_pos):
365 """Set the position in the image
368 image_pos: Position of this entry in the image
370 self.image_pos = image_pos + self.offset
372 def ProcessContents(self):
375 def WriteSymbols(self, section):
376 """Write symbol values into binary files for access at run time
379 section: Section containing the entry
383 def CheckOffset(self):
384 """Check that the entry offsets are correct
386 This is used for entries which have extra offset requirements (other
387 than having to be fully inside their section). Sub-classes can implement
388 this function and raise if there is a problem.
393 def WriteMapLine(fd, indent, name, offset, size, image_pos):
394 print('%08x %s%08x %08x %s' % (image_pos, ' ' * indent, offset,
395 size, name), file=fd)
397 def WriteMap(self, fd, indent):
398 """Write a map of the entry to a .map file
401 fd: File to write the map to
402 indent: Curent indent level of map (0=none, 1=one level, etc.)
404 self.WriteMapLine(fd, indent, self.name, self.offset, self.size,
407 def GetEntries(self):
408 """Return a list of entries contained by this entry
411 List of entries, or None if none. A normal entry has no entries
412 within it so will return None
416 def GetArg(self, name, datatype=str):
417 """Get the value of an entry argument or device-tree-node property
419 Some node properties can be provided as arguments to binman. First check
420 the entry arguments, and fall back to the device tree if not found
424 datatype: Data type (str or int)
427 Value of argument as a string or int, or None if no value
430 ValueError if the argument cannot be converted to in
432 value = state.GetEntryArg(name)
433 if value is not None:
438 self.Raise("Cannot convert entry arg '%s' (value '%s') to integer" %
440 elif datatype == str:
443 raise ValueError("GetArg() internal error: Unknown data type '%s'" %
446 value = fdt_util.GetDatatype(self._node, name, datatype)
450 def WriteDocs(modules, test_missing=None):
451 """Write out documentation about the various entry types to stdout
454 modules: List of modules to include
455 test_missing: Used for testing. This is a module to report
458 print('''Binman Entry Documentation
459 ===========================
461 This file describes the entry types supported by binman. These entry types can
462 be placed in an image one by one to build up a final firmware image. It is
463 fairly easy to create new entry types. Just add a new file to the 'etype'
464 directory. You can use the existing entries as examples.
466 Note that some entries are subclasses of others, using and extending their
467 features to produce new behaviours.
471 modules = sorted(modules)
473 # Don't show the test entry
474 if '_testing' in modules:
475 modules.remove('_testing')
478 module = Entry.Lookup(name, name, name)
479 docs = getattr(module, '__doc__')
480 if test_missing == name:
483 lines = docs.splitlines()
484 first_line = lines[0]
485 rest = [line[4:] for line in lines[1:]]
486 hdr = 'Entry: %s: %s' % (name.replace('_', '-'), first_line)
488 print('-' * len(hdr))
489 print('\n'.join(rest))
496 raise ValueError('Documentation is missing for modules: %s' %
499 def GetUniqueName(self):
500 """Get a unique name for a node
503 String containing a unique name for a node, consisting of the name
504 of all ancestors (starting from within the 'binman' node) separated
505 by a dot ('.'). This can be useful for generating unique filesnames
506 in the output directory.
512 if node.name == 'binman':
514 name = '%s.%s' % (node.name, name)
517 def ExpandToLimit(self, limit):
518 """Expand an entry so that it ends at the given offset limit"""
519 if self.offset + self.size < limit:
520 self.size = limit - self.offset
521 # Request the contents again, since changing the size requires that
522 # the data grows. This should not fail, but check it to be sure.
523 if not self.ObtainContents():
524 self.Raise('Cannot obtain contents when expanding entry')