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
28 our_path = os.path.dirname(os.path.realpath(__file__))
31 # An argument which can be passed to entries on the command line, in lieu of
32 # device-tree properties.
33 EntryArg = namedtuple('EntryArg', ['name', 'datatype'])
37 """An Entry in the section
39 An entry corresponds to a single node in the device-tree description
40 of the section. Each entry ends up being a part of the final section.
41 Entries can be placed either right next to each other, or with padding
42 between them. The type of the entry determines the data that is in it.
44 This class is not used by itself. All entry objects are subclasses of
48 section: Section object containing this entry
49 node: The node that created this entry
50 offset: Offset of entry within the section, None if not known yet (in
51 which case it will be calculated by Pack())
52 size: Entry size in bytes, None if not known
53 contents_size: Size of contents in bytes, 0 by default
54 align: Entry start offset alignment, or None
55 align_size: Entry size alignment, or None
56 align_end: Entry end offset alignment, or None
57 pad_before: Number of pad bytes before the contents, 0 if none
58 pad_after: Number of pad bytes after the contents, 0 if none
59 data: Contents of entry (string of bytes)
61 def __init__(self, section, etype, node, read_node=True, name_prefix=''):
62 self.section = section
65 self.name = node and (name_prefix + node.name) or 'none'
69 self.contents_size = 0
71 self.align_size = None
75 self.offset_unset = False
81 def Lookup(section, node_path, etype):
82 """Look up the entry class for a node.
85 section: Section object containing this node
86 node_node: Path name of Node object containing information about
87 the entry to create (used for errors)
88 etype: Entry type to use
91 The entry class object if found, else None
93 # Convert something like 'u-boot@0' to 'u_boot' since we are only
94 # interested in the type.
95 module_name = etype.replace('-', '_')
96 if '@' in module_name:
97 module_name = module_name.split('@')[0]
98 module = modules.get(module_name)
100 # Also allow entry-type modules to be brought in from the etype directory.
102 # Import the module if we have not already done so.
105 sys.path.insert(0, os.path.join(our_path, 'etype'))
108 module = importlib.import_module(module_name)
110 module = __import__(module_name)
111 except ImportError as e:
112 raise ValueError("Unknown entry type '%s' in node '%s' (expected etype/%s.py, error '%s'" %
113 (etype, node_path, module_name, e))
116 modules[module_name] = module
118 # Look up the expected class name
119 return getattr(module, 'Entry_%s' % module_name)
122 def Create(section, node, etype=None):
123 """Create a new entry for a node.
126 section: Section object containing this node
127 node: Node object containing information about the entry to
129 etype: Entry type to use, or None to work it out (used for tests)
132 A new Entry object of the correct type (a subclass of Entry)
135 etype = fdt_util.GetString(node, 'type', node.name)
136 obj = Entry.Lookup(section, node.path, etype)
138 # Call its constructor to get the object we want.
139 return obj(section, etype, node)
142 """Read entry information from the node
144 This reads all the fields we recognise from the node, ready for use.
146 if 'pos' in self._node.props:
147 self.Raise("Please use 'offset' instead of 'pos'")
148 self.offset = fdt_util.GetInt(self._node, 'offset')
149 self.size = fdt_util.GetInt(self._node, 'size')
150 self.align = fdt_util.GetInt(self._node, 'align')
151 if tools.NotPowerOfTwo(self.align):
152 raise ValueError("Node '%s': Alignment %s must be a power of two" %
153 (self._node.path, self.align))
154 self.pad_before = fdt_util.GetInt(self._node, 'pad-before', 0)
155 self.pad_after = fdt_util.GetInt(self._node, 'pad-after', 0)
156 self.align_size = fdt_util.GetInt(self._node, 'align-size')
157 if tools.NotPowerOfTwo(self.align_size):
158 raise ValueError("Node '%s': Alignment size %s must be a power "
159 "of two" % (self._node.path, self.align_size))
160 self.align_end = fdt_util.GetInt(self._node, 'align-end')
161 self.offset_unset = fdt_util.GetBool(self._node, 'offset-unset')
163 def GetDefaultFilename(self):
166 def AddMissingProperties(self):
167 """Add new properties to the device tree as needed for this entry"""
168 for prop in ['offset', 'size', 'image-pos']:
169 if not prop in self._node.props:
170 self._node.AddZeroProp(prop)
172 def SetCalculatedProperties(self):
173 """Set the value of device-tree properties calculated by binman"""
174 self._node.SetInt('offset', self.offset)
175 self._node.SetInt('size', self.size)
176 self._node.SetInt('image-pos', self.image_pos)
178 def ProcessFdt(self, fdt):
181 def SetPrefix(self, prefix):
182 """Set the name prefix for a node
185 prefix: Prefix to set, or '' to not use a prefix
188 self.name = prefix + self.name
190 def SetContents(self, data):
191 """Set the contents of an entry
193 This sets both the data and content_size properties
196 data: Data to set to the contents (string)
199 self.contents_size = len(self.data)
201 def ProcessContentsUpdate(self, data):
202 """Update the contens of an entry, after the size is fixed
204 This checks that the new data is the same size as the old.
207 data: Data to set to the contents (string)
210 ValueError if the new data size is not the same as the old
212 if len(data) != self.contents_size:
213 self.Raise('Cannot update entry size from %d to %d' %
214 (len(data), self.contents_size))
215 self.SetContents(data)
217 def ObtainContents(self):
218 """Figure out the contents of an entry.
221 True if the contents were found, False if another call is needed
222 after the other entries are processed.
224 # No contents by default: subclasses can implement this
227 def Pack(self, offset):
228 """Figure out how to pack the entry into the section
230 Most of the time the entries are not fully specified. There may be
231 an alignment but no size. In that case we take the size from the
232 contents of the entry.
234 If an entry has no hard-coded offset, it will be placed at @offset.
236 Once this function is complete, both the offset and size of the
240 Current section offset pointer
243 New section offset pointer (after this entry)
245 if self.offset is None:
246 if self.offset_unset:
247 self.Raise('No offset set with offset-unset: should another '
248 'entry provide this correct offset?')
249 self.offset = tools.Align(offset, self.align)
250 needed = self.pad_before + self.contents_size + self.pad_after
251 needed = tools.Align(needed, self.align_size)
255 new_offset = self.offset + size
256 aligned_offset = tools.Align(new_offset, self.align_end)
257 if aligned_offset != new_offset:
258 size = aligned_offset - self.offset
259 new_offset = aligned_offset
264 if self.size < needed:
265 self.Raise("Entry contents size is %#x (%d) but entry size is "
266 "%#x (%d)" % (needed, needed, self.size, self.size))
267 # Check that the alignment is correct. It could be wrong if the
268 # and offset or size values were provided (i.e. not calculated), but
269 # conflict with the provided alignment values
270 if self.size != tools.Align(self.size, self.align_size):
271 self.Raise("Size %#x (%d) does not match align-size %#x (%d)" %
272 (self.size, self.size, self.align_size, self.align_size))
273 if self.offset != tools.Align(self.offset, self.align):
274 self.Raise("Offset %#x (%d) does not match align %#x (%d)" %
275 (self.offset, self.offset, self.align, self.align))
279 def Raise(self, msg):
280 """Convenience function to raise an error referencing a node"""
281 raise ValueError("Node '%s': %s" % (self._node.path, msg))
283 def GetEntryArgsOrProps(self, props, required=False):
284 """Return the values of a set of properties
287 props: List of EntryArg objects
290 ValueError if a property is not found
295 python_prop = prop.name.replace('-', '_')
296 if hasattr(self, python_prop):
297 value = getattr(self, python_prop)
301 value = self.GetArg(prop.name, prop.datatype)
302 if value is None and required:
303 missing.append(prop.name)
306 self.Raise('Missing required properties/entry args: %s' %
307 (', '.join(missing)))
311 """Get the path of a node
314 Full path of the node for this entry
316 return self._node.path
321 def GetOffsets(self):
324 def SetOffsetSize(self, pos, size):
328 def SetImagePos(self, image_pos):
329 """Set the position in the image
332 image_pos: Position of this entry in the image
334 self.image_pos = image_pos + self.offset
336 def ProcessContents(self):
339 def WriteSymbols(self, section):
340 """Write symbol values into binary files for access at run time
343 section: Section containing the entry
347 def CheckOffset(self):
348 """Check that the entry offsets are correct
350 This is used for entries which have extra offset requirements (other
351 than having to be fully inside their section). Sub-classes can implement
352 this function and raise if there is a problem.
357 def WriteMapLine(fd, indent, name, offset, size, image_pos):
358 print('%08x %s%08x %08x %s' % (image_pos, ' ' * indent, offset,
359 size, name), file=fd)
361 def WriteMap(self, fd, indent):
362 """Write a map of the entry to a .map file
365 fd: File to write the map to
366 indent: Curent indent level of map (0=none, 1=one level, etc.)
368 self.WriteMapLine(fd, indent, self.name, self.offset, self.size,
371 def GetEntries(self):
372 """Return a list of entries contained by this entry
375 List of entries, or None if none. A normal entry has no entries
376 within it so will return None
380 def GetArg(self, name, datatype=str):
381 """Get the value of an entry argument or device-tree-node property
383 Some node properties can be provided as arguments to binman. First check
384 the entry arguments, and fall back to the device tree if not found
388 datatype: Data type (str or int)
391 Value of argument as a string or int, or None if no value
394 ValueError if the argument cannot be converted to in
396 value = control.GetEntryArg(name)
397 if value is not None:
402 self.Raise("Cannot convert entry arg '%s' (value '%s') to integer" %
404 elif datatype == str:
407 raise ValueError("GetArg() internal error: Unknown data type '%s'" %
410 value = fdt_util.GetDatatype(self._node, name, datatype)
414 def WriteDocs(modules, test_missing=None):
415 """Write out documentation about the various entry types to stdout
418 modules: List of modules to include
419 test_missing: Used for testing. This is a module to report
422 print('''Binman Entry Documentation
423 ===========================
425 This file describes the entry types supported by binman. These entry types can
426 be placed in an image one by one to build up a final firmware image. It is
427 fairly easy to create new entry types. Just add a new file to the 'etype'
428 directory. You can use the existing entries as examples.
430 Note that some entries are subclasses of others, using and extending their
431 features to produce new behaviours.
435 modules = sorted(modules)
437 # Don't show the test entry
438 if '_testing' in modules:
439 modules.remove('_testing')
442 module = Entry.Lookup(name, name, name)
443 docs = getattr(module, '__doc__')
444 if test_missing == name:
447 lines = docs.splitlines()
448 first_line = lines[0]
449 rest = [line[4:] for line in lines[1:]]
450 hdr = 'Entry: %s: %s' % (name.replace('_', '-'), first_line)
452 print('-' * len(hdr))
453 print('\n'.join(rest))
460 raise ValueError('Documentation is missing for modules: %s' %
463 def GetUniqueName(self):
464 """Get a unique name for a node
467 String containing a unique name for a node, consisting of the name
468 of all ancestors (starting from within the 'binman' node) separated
469 by a dot ('.'). This can be useful for generating unique filesnames
470 in the output directory.
476 if node.name == 'binman':
478 name = '%s.%s' % (node.name, name)