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)
193 def SetCalculatedProperties(self):
194 """Set the value of device-tree properties calculated by binman"""
195 state.SetInt(self._node, 'offset', self.offset)
196 state.SetInt(self._node, 'size', self.size)
197 state.SetInt(self._node, 'image-pos', self.image_pos)
199 def ProcessFdt(self, fdt):
200 """Allow entries to adjust the device tree
202 Some entries need to adjust the device tree for their purposes. This
203 may involve adding or deleting properties.
206 True if processing is complete
207 False if processing could not be completed due to a dependency.
208 This will cause the entry to be retried after others have been
213 def SetPrefix(self, prefix):
214 """Set the name prefix for a node
217 prefix: Prefix to set, or '' to not use a prefix
220 self.name = prefix + self.name
222 def SetContents(self, data):
223 """Set the contents of an entry
225 This sets both the data and content_size properties
228 data: Data to set to the contents (string)
231 self.contents_size = len(self.data)
233 def ProcessContentsUpdate(self, data):
234 """Update the contens of an entry, after the size is fixed
236 This checks that the new data is the same size as the old.
239 data: Data to set to the contents (string)
242 ValueError if the new data size is not the same as the old
244 if len(data) != self.contents_size:
245 self.Raise('Cannot update entry size from %d to %d' %
246 (len(data), self.contents_size))
247 self.SetContents(data)
249 def ObtainContents(self):
250 """Figure out the contents of an entry.
253 True if the contents were found, False if another call is needed
254 after the other entries are processed.
256 # No contents by default: subclasses can implement this
259 def Pack(self, offset):
260 """Figure out how to pack the entry into the section
262 Most of the time the entries are not fully specified. There may be
263 an alignment but no size. In that case we take the size from the
264 contents of the entry.
266 If an entry has no hard-coded offset, it will be placed at @offset.
268 Once this function is complete, both the offset and size of the
272 Current section offset pointer
275 New section offset pointer (after this entry)
277 if self.offset is None:
278 if self.offset_unset:
279 self.Raise('No offset set with offset-unset: should another '
280 'entry provide this correct offset?')
281 self.offset = tools.Align(offset, self.align)
282 needed = self.pad_before + self.contents_size + self.pad_after
283 needed = tools.Align(needed, self.align_size)
287 new_offset = self.offset + size
288 aligned_offset = tools.Align(new_offset, self.align_end)
289 if aligned_offset != new_offset:
290 size = aligned_offset - self.offset
291 new_offset = aligned_offset
296 if self.size < needed:
297 self.Raise("Entry contents size is %#x (%d) but entry size is "
298 "%#x (%d)" % (needed, needed, self.size, self.size))
299 # Check that the alignment is correct. It could be wrong if the
300 # and offset or size values were provided (i.e. not calculated), but
301 # conflict with the provided alignment values
302 if self.size != tools.Align(self.size, self.align_size):
303 self.Raise("Size %#x (%d) does not match align-size %#x (%d)" %
304 (self.size, self.size, self.align_size, self.align_size))
305 if self.offset != tools.Align(self.offset, self.align):
306 self.Raise("Offset %#x (%d) does not match align %#x (%d)" %
307 (self.offset, self.offset, self.align, self.align))
311 def Raise(self, msg):
312 """Convenience function to raise an error referencing a node"""
313 raise ValueError("Node '%s': %s" % (self._node.path, msg))
315 def GetEntryArgsOrProps(self, props, required=False):
316 """Return the values of a set of properties
319 props: List of EntryArg objects
322 ValueError if a property is not found
327 python_prop = prop.name.replace('-', '_')
328 if hasattr(self, python_prop):
329 value = getattr(self, python_prop)
333 value = self.GetArg(prop.name, prop.datatype)
334 if value is None and required:
335 missing.append(prop.name)
338 self.Raise('Missing required properties/entry args: %s' %
339 (', '.join(missing)))
343 """Get the path of a node
346 Full path of the node for this entry
348 return self._node.path
353 def GetOffsets(self):
356 def SetOffsetSize(self, pos, size):
360 def SetImagePos(self, image_pos):
361 """Set the position in the image
364 image_pos: Position of this entry in the image
366 self.image_pos = image_pos + self.offset
368 def ProcessContents(self):
371 def WriteSymbols(self, section):
372 """Write symbol values into binary files for access at run time
375 section: Section containing the entry
379 def CheckOffset(self):
380 """Check that the entry offsets are correct
382 This is used for entries which have extra offset requirements (other
383 than having to be fully inside their section). Sub-classes can implement
384 this function and raise if there is a problem.
389 def WriteMapLine(fd, indent, name, offset, size, image_pos):
390 print('%08x %s%08x %08x %s' % (image_pos, ' ' * indent, offset,
391 size, name), file=fd)
393 def WriteMap(self, fd, indent):
394 """Write a map of the entry to a .map file
397 fd: File to write the map to
398 indent: Curent indent level of map (0=none, 1=one level, etc.)
400 self.WriteMapLine(fd, indent, self.name, self.offset, self.size,
403 def GetEntries(self):
404 """Return a list of entries contained by this entry
407 List of entries, or None if none. A normal entry has no entries
408 within it so will return None
412 def GetArg(self, name, datatype=str):
413 """Get the value of an entry argument or device-tree-node property
415 Some node properties can be provided as arguments to binman. First check
416 the entry arguments, and fall back to the device tree if not found
420 datatype: Data type (str or int)
423 Value of argument as a string or int, or None if no value
426 ValueError if the argument cannot be converted to in
428 value = state.GetEntryArg(name)
429 if value is not None:
434 self.Raise("Cannot convert entry arg '%s' (value '%s') to integer" %
436 elif datatype == str:
439 raise ValueError("GetArg() internal error: Unknown data type '%s'" %
442 value = fdt_util.GetDatatype(self._node, name, datatype)
446 def WriteDocs(modules, test_missing=None):
447 """Write out documentation about the various entry types to stdout
450 modules: List of modules to include
451 test_missing: Used for testing. This is a module to report
454 print('''Binman Entry Documentation
455 ===========================
457 This file describes the entry types supported by binman. These entry types can
458 be placed in an image one by one to build up a final firmware image. It is
459 fairly easy to create new entry types. Just add a new file to the 'etype'
460 directory. You can use the existing entries as examples.
462 Note that some entries are subclasses of others, using and extending their
463 features to produce new behaviours.
467 modules = sorted(modules)
469 # Don't show the test entry
470 if '_testing' in modules:
471 modules.remove('_testing')
474 module = Entry.Lookup(name, name, name)
475 docs = getattr(module, '__doc__')
476 if test_missing == name:
479 lines = docs.splitlines()
480 first_line = lines[0]
481 rest = [line[4:] for line in lines[1:]]
482 hdr = 'Entry: %s: %s' % (name.replace('_', '-'), first_line)
484 print('-' * len(hdr))
485 print('\n'.join(rest))
492 raise ValueError('Documentation is missing for modules: %s' %
495 def GetUniqueName(self):
496 """Get a unique name for a node
499 String containing a unique name for a node, consisting of the name
500 of all ancestors (starting from within the 'binman' node) separated
501 by a dot ('.'). This can be useful for generating unique filesnames
502 in the output directory.
508 if node.name == 'binman':
510 name = '%s.%s' % (node.name, name)
513 def ExpandToLimit(self, limit):
514 """Expand an entry so that it ends at the given offset limit"""
515 if self.offset + self.size < limit:
516 self.size = limit - self.offset
517 # Request the contents again, since changing the size requires that
518 # the data grows. This should not fail, but check it to be sure.
519 if not self.ObtainContents():
520 self.Raise('Cannot obtain contents when expanding entry')