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'])
37 # Information about an entry for use when displaying summaries
38 EntryInfo = namedtuple('EntryInfo', ['indent', 'name', 'etype', 'size',
39 'image_pos', 'uncomp_size', 'offset',
43 """An Entry in the section
45 An entry corresponds to a single node in the device-tree description
46 of the section. Each entry ends up being a part of the final section.
47 Entries can be placed either right next to each other, or with padding
48 between them. The type of the entry determines the data that is in it.
50 This class is not used by itself. All entry objects are subclasses of
54 section: Section object containing this entry
55 node: The node that created this entry
56 offset: Offset of entry within the section, None if not known yet (in
57 which case it will be calculated by Pack())
58 size: Entry size in bytes, None if not known
59 uncomp_size: Size of uncompressed data in bytes, if the entry is
61 contents_size: Size of contents in bytes, 0 by default
62 align: Entry start offset alignment, or None
63 align_size: Entry size alignment, or None
64 align_end: Entry end offset alignment, or None
65 pad_before: Number of pad bytes before the contents, 0 if none
66 pad_after: Number of pad bytes after the contents, 0 if none
67 data: Contents of entry (string of bytes)
68 compress: Compression algoithm used (e.g. 'lz4'), 'none' if none
69 orig_offset: Original offset value read from node
70 orig_size: Original size value read from node
72 def __init__(self, section, etype, node, read_node=True, name_prefix=''):
73 self.section = section
76 self.name = node and (name_prefix + node.name) or 'none'
79 self.uncomp_size = None
81 self.contents_size = 0
83 self.align_size = None
87 self.offset_unset = False
89 self._expand_size = False
90 self.compress = 'none'
95 def Lookup(node_path, etype):
96 """Look up the entry class for a node.
99 node_node: Path name of Node object containing information about
100 the entry to create (used for errors)
101 etype: Entry type to use
104 The entry class object if found, else None
106 # Convert something like 'u-boot@0' to 'u_boot' since we are only
107 # interested in the type.
108 module_name = etype.replace('-', '_')
109 if '@' in module_name:
110 module_name = module_name.split('@')[0]
111 module = modules.get(module_name)
113 # Also allow entry-type modules to be brought in from the etype directory.
115 # Import the module if we have not already done so.
118 sys.path.insert(0, os.path.join(our_path, 'etype'))
121 module = importlib.import_module(module_name)
123 module = __import__(module_name)
124 except ImportError as e:
125 raise ValueError("Unknown entry type '%s' in node '%s' (expected etype/%s.py, error '%s'" %
126 (etype, node_path, module_name, e))
129 modules[module_name] = module
131 # Look up the expected class name
132 return getattr(module, 'Entry_%s' % module_name)
135 def Create(section, node, etype=None):
136 """Create a new entry for a node.
139 section: Section object containing this node
140 node: Node object containing information about the entry to
142 etype: Entry type to use, or None to work it out (used for tests)
145 A new Entry object of the correct type (a subclass of Entry)
148 etype = fdt_util.GetString(node, 'type', node.name)
149 obj = Entry.Lookup(node.path, etype)
151 # Call its constructor to get the object we want.
152 return obj(section, etype, node)
155 """Read entry information from the node
157 This reads all the fields we recognise from the node, ready for use.
159 if 'pos' in self._node.props:
160 self.Raise("Please use 'offset' instead of 'pos'")
161 self.offset = fdt_util.GetInt(self._node, 'offset')
162 self.size = fdt_util.GetInt(self._node, 'size')
163 self.orig_offset = self.offset
164 self.orig_size = self.size
166 # These should not be set in input files, but are set in an FDT map,
167 # which is also read by this code.
168 self.image_pos = fdt_util.GetInt(self._node, 'image-pos')
169 self.uncomp_size = fdt_util.GetInt(self._node, 'uncomp-size')
171 self.align = fdt_util.GetInt(self._node, 'align')
172 if tools.NotPowerOfTwo(self.align):
173 raise ValueError("Node '%s': Alignment %s must be a power of two" %
174 (self._node.path, self.align))
175 self.pad_before = fdt_util.GetInt(self._node, 'pad-before', 0)
176 self.pad_after = fdt_util.GetInt(self._node, 'pad-after', 0)
177 self.align_size = fdt_util.GetInt(self._node, 'align-size')
178 if tools.NotPowerOfTwo(self.align_size):
179 self.Raise("Alignment size %s must be a power of two" %
181 self.align_end = fdt_util.GetInt(self._node, 'align-end')
182 self.offset_unset = fdt_util.GetBool(self._node, 'offset-unset')
183 self.expand_size = fdt_util.GetBool(self._node, 'expand-size')
185 def GetDefaultFilename(self):
189 """Get the set of device trees used by this entry
192 Set containing the filename from this entry, if it is a .dtb, else
195 fname = self.GetDefaultFilename()
196 # It would be better to use isinstance(self, Entry_blob_dtb) here but
197 # we cannot access Entry_blob_dtb
198 if fname and fname.endswith('.dtb'):
202 def ExpandEntries(self):
205 def AddMissingProperties(self):
206 """Add new properties to the device tree as needed for this entry"""
207 for prop in ['offset', 'size', 'image-pos']:
208 if not prop in self._node.props:
209 state.AddZeroProp(self._node, prop)
210 if self.compress != 'none':
211 state.AddZeroProp(self._node, 'uncomp-size')
212 err = state.CheckAddHashProp(self._node)
216 def SetCalculatedProperties(self):
217 """Set the value of device-tree properties calculated by binman"""
218 state.SetInt(self._node, 'offset', self.offset)
219 state.SetInt(self._node, 'size', self.size)
220 base = self.section.GetRootSkipAtStart() if self.section else 0
221 state.SetInt(self._node, 'image-pos', self.image_pos - base)
222 if self.uncomp_size is not None:
223 state.SetInt(self._node, 'uncomp-size', self.uncomp_size)
224 state.CheckSetHashValue(self._node, self.GetData)
226 def ProcessFdt(self, fdt):
227 """Allow entries to adjust the device tree
229 Some entries need to adjust the device tree for their purposes. This
230 may involve adding or deleting properties.
233 True if processing is complete
234 False if processing could not be completed due to a dependency.
235 This will cause the entry to be retried after others have been
240 def SetPrefix(self, prefix):
241 """Set the name prefix for a node
244 prefix: Prefix to set, or '' to not use a prefix
247 self.name = prefix + self.name
249 def SetContents(self, data):
250 """Set the contents of an entry
252 This sets both the data and content_size properties
255 data: Data to set to the contents (bytes)
258 self.contents_size = len(self.data)
260 def ProcessContentsUpdate(self, data):
261 """Update the contents of an entry, after the size is fixed
263 This checks that the new data is the same size as the old. If the size
264 has changed, this triggers a re-run of the packing algorithm.
267 data: Data to set to the contents (bytes)
270 ValueError if the new data size is not the same as the old
274 if state.AllowEntryExpansion():
275 if new_size > self.contents_size:
276 tout.Debug("Entry '%s' size change from %#x to %#x" % (
277 self._node.path, self.contents_size, new_size))
278 # self.data will indicate the new size needed
280 elif new_size != self.contents_size:
281 self.Raise('Cannot update entry size from %d to %d' %
282 (self.contents_size, new_size))
283 self.SetContents(data)
286 def ObtainContents(self):
287 """Figure out the contents of an entry.
290 True if the contents were found, False if another call is needed
291 after the other entries are processed.
293 # No contents by default: subclasses can implement this
296 def ResetForPack(self):
297 """Reset offset/size fields so that packing can be done again"""
298 self.offset = self.orig_offset
299 self.size = self.orig_size
301 def Pack(self, offset):
302 """Figure out how to pack the entry into the section
304 Most of the time the entries are not fully specified. There may be
305 an alignment but no size. In that case we take the size from the
306 contents of the entry.
308 If an entry has no hard-coded offset, it will be placed at @offset.
310 Once this function is complete, both the offset and size of the
314 Current section offset pointer
317 New section offset pointer (after this entry)
319 if self.offset is None:
320 if self.offset_unset:
321 self.Raise('No offset set with offset-unset: should another '
322 'entry provide this correct offset?')
323 self.offset = tools.Align(offset, self.align)
324 needed = self.pad_before + self.contents_size + self.pad_after
325 needed = tools.Align(needed, self.align_size)
329 new_offset = self.offset + size
330 aligned_offset = tools.Align(new_offset, self.align_end)
331 if aligned_offset != new_offset:
332 size = aligned_offset - self.offset
333 new_offset = aligned_offset
338 if self.size < needed:
339 self.Raise("Entry contents size is %#x (%d) but entry size is "
340 "%#x (%d)" % (needed, needed, self.size, self.size))
341 # Check that the alignment is correct. It could be wrong if the
342 # and offset or size values were provided (i.e. not calculated), but
343 # conflict with the provided alignment values
344 if self.size != tools.Align(self.size, self.align_size):
345 self.Raise("Size %#x (%d) does not match align-size %#x (%d)" %
346 (self.size, self.size, self.align_size, self.align_size))
347 if self.offset != tools.Align(self.offset, self.align):
348 self.Raise("Offset %#x (%d) does not match align %#x (%d)" %
349 (self.offset, self.offset, self.align, self.align))
353 def Raise(self, msg):
354 """Convenience function to raise an error referencing a node"""
355 raise ValueError("Node '%s': %s" % (self._node.path, msg))
357 def GetEntryArgsOrProps(self, props, required=False):
358 """Return the values of a set of properties
361 props: List of EntryArg objects
364 ValueError if a property is not found
369 python_prop = prop.name.replace('-', '_')
370 if hasattr(self, python_prop):
371 value = getattr(self, python_prop)
375 value = self.GetArg(prop.name, prop.datatype)
376 if value is None and required:
377 missing.append(prop.name)
380 self.Raise('Missing required properties/entry args: %s' %
381 (', '.join(missing)))
385 """Get the path of a node
388 Full path of the node for this entry
390 return self._node.path
395 def GetOffsets(self):
396 """Get the offsets for siblings
398 Some entry types can contain information about the position or size of
399 other entries. An example of this is the Intel Flash Descriptor, which
400 knows where the Intel Management Engine section should go.
402 If this entry knows about the position of other entries, it can specify
403 this by returning values here
408 value: List containing position and size of the given entry
409 type. Either can be None if not known
413 def SetOffsetSize(self, offset, size):
414 """Set the offset and/or size of an entry
417 offset: New offset, or None to leave alone
418 size: New size, or None to leave alone
420 if offset is not None:
425 def SetImagePos(self, image_pos):
426 """Set the position in the image
429 image_pos: Position of this entry in the image
431 self.image_pos = image_pos + self.offset
433 def ProcessContents(self):
434 """Do any post-packing updates of entry contents
436 This function should call ProcessContentsUpdate() to update the entry
437 contents, if necessary, returning its return value here.
440 data: Data to set to the contents (bytes)
443 True if the new data size is OK, False if expansion is needed
446 ValueError if the new data size is not the same as the old and
447 state.AllowEntryExpansion() is False
451 def WriteSymbols(self, section):
452 """Write symbol values into binary files for access at run time
455 section: Section containing the entry
459 def CheckOffset(self):
460 """Check that the entry offsets are correct
462 This is used for entries which have extra offset requirements (other
463 than having to be fully inside their section). Sub-classes can implement
464 this function and raise if there is a problem.
472 return '%08x' % value
475 def WriteMapLine(fd, indent, name, offset, size, image_pos):
476 print('%s %s%s %s %s' % (Entry.GetStr(image_pos), ' ' * indent,
477 Entry.GetStr(offset), Entry.GetStr(size),
480 def WriteMap(self, fd, indent):
481 """Write a map of the entry to a .map file
484 fd: File to write the map to
485 indent: Curent indent level of map (0=none, 1=one level, etc.)
487 self.WriteMapLine(fd, indent, self.name, self.offset, self.size,
490 def GetEntries(self):
491 """Return a list of entries contained by this entry
494 List of entries, or None if none. A normal entry has no entries
495 within it so will return None
499 def GetArg(self, name, datatype=str):
500 """Get the value of an entry argument or device-tree-node property
502 Some node properties can be provided as arguments to binman. First check
503 the entry arguments, and fall back to the device tree if not found
507 datatype: Data type (str or int)
510 Value of argument as a string or int, or None if no value
513 ValueError if the argument cannot be converted to in
515 value = state.GetEntryArg(name)
516 if value is not None:
521 self.Raise("Cannot convert entry arg '%s' (value '%s') to integer" %
523 elif datatype == str:
526 raise ValueError("GetArg() internal error: Unknown data type '%s'" %
529 value = fdt_util.GetDatatype(self._node, name, datatype)
533 def WriteDocs(modules, test_missing=None):
534 """Write out documentation about the various entry types to stdout
537 modules: List of modules to include
538 test_missing: Used for testing. This is a module to report
541 print('''Binman Entry Documentation
542 ===========================
544 This file describes the entry types supported by binman. These entry types can
545 be placed in an image one by one to build up a final firmware image. It is
546 fairly easy to create new entry types. Just add a new file to the 'etype'
547 directory. You can use the existing entries as examples.
549 Note that some entries are subclasses of others, using and extending their
550 features to produce new behaviours.
554 modules = sorted(modules)
556 # Don't show the test entry
557 if '_testing' in modules:
558 modules.remove('_testing')
561 if name.startswith('__'):
563 module = Entry.Lookup(name, name)
564 docs = getattr(module, '__doc__')
565 if test_missing == name:
568 lines = docs.splitlines()
569 first_line = lines[0]
570 rest = [line[4:] for line in lines[1:]]
571 hdr = 'Entry: %s: %s' % (name.replace('_', '-'), first_line)
573 print('-' * len(hdr))
574 print('\n'.join(rest))
581 raise ValueError('Documentation is missing for modules: %s' %
584 def GetUniqueName(self):
585 """Get a unique name for a node
588 String containing a unique name for a node, consisting of the name
589 of all ancestors (starting from within the 'binman' node) separated
590 by a dot ('.'). This can be useful for generating unique filesnames
591 in the output directory.
597 if node.name == 'binman':
599 name = '%s.%s' % (node.name, name)
602 def ExpandToLimit(self, limit):
603 """Expand an entry so that it ends at the given offset limit"""
604 if self.offset + self.size < limit:
605 self.size = limit - self.offset
606 # Request the contents again, since changing the size requires that
607 # the data grows. This should not fail, but check it to be sure.
608 if not self.ObtainContents():
609 self.Raise('Cannot obtain contents when expanding entry')
611 def HasSibling(self, name):
612 """Check if there is a sibling of a given name
615 True if there is an entry with this name in the the same section,
618 return name in self.section.GetEntries()
620 def GetSiblingImagePos(self, name):
621 """Return the image position of the given sibling
624 Image position of sibling, or None if the sibling has no position,
625 or False if there is no such sibling
627 if not self.HasSibling(name):
629 return self.section.GetEntries()[name].image_pos
632 def AddEntryInfo(entries, indent, name, etype, size, image_pos,
633 uncomp_size, offset, entry):
634 """Add a new entry to the entries list
637 entries: List (of EntryInfo objects) to add to
638 indent: Current indent level to add to list
639 name: Entry name (string)
640 etype: Entry type (string)
641 size: Entry size in bytes (int)
642 image_pos: Position within image in bytes (int)
643 uncomp_size: Uncompressed size if the entry uses compression, else
645 offset: Entry offset within parent in bytes (int)
648 entries.append(EntryInfo(indent, name, etype, size, image_pos,
649 uncomp_size, offset, entry))
651 def ListEntries(self, entries, indent):
652 """Add files in this entry to the list of entries
654 This can be overridden by subclasses which need different behaviour.
657 entries: List (of EntryInfo objects) to add to
658 indent: Current indent level to add to list
660 self.AddEntryInfo(entries, indent, self.name, self.etype, self.size,
661 self.image_pos, self.uncomp_size, self.offset, self)
663 def ReadData(self, decomp=True):
664 """Read the data for an entry from the image
666 This is used when the image has been read in and we want to extract the
667 data for a particular entry from that image.
670 decomp: True to decompress any compressed data before returning it;
671 False to return the raw, uncompressed data
676 # Use True here so that we get an uncompressed section to work from,
677 # although compressed sections are currently not supported
678 data = self.section.ReadData(True)
679 tout.Info('%s: Reading data from offset %#x-%#x, size %#x (avail %#x)' %
680 (self.GetPath(), self.offset, self.offset + self.size,
681 self.size, len(data)))
682 return data[self.offset:self.offset + self.size]