mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-27 05:13:44 +09:00
078ab1a2f5
Once binman has packed the image, the position and size of each entry is known. It is then possible for binman to update the device tree with these positions. Since placeholder values have been added, this does not affect the size of the device tree and therefore the packing does not need to be performed again. Add a new SetCalculatedProperties method to handle this. Signed-off-by: Simon Glass <sjg@chromium.org>
346 lines
13 KiB
Python
346 lines
13 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2018 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# Base class for sections (collections of entries)
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#
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from __future__ import print_function
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from collections import OrderedDict
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import sys
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import fdt_util
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import re
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import tools
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class Section(object):
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"""A section which contains multiple entries
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A section represents a collection of entries. There must be one or more
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sections in an image. Sections are used to group entries together.
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Attributes:
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_node: Node object that contains the section definition in device tree
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_size: Section size in bytes, or None if not known yet
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_align_size: Section size alignment, or None
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_pad_before: Number of bytes before the first entry starts. This
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effectively changes the place where entry position 0 starts
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_pad_after: Number of bytes after the last entry ends. The last
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entry will finish on or before this boundary
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_pad_byte: Byte to use to pad the section where there is no entry
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_sort: True if entries should be sorted by position, False if they
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must be in-order in the device tree description
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_skip_at_start: Number of bytes before the first entry starts. These
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effectively adjust the starting position of entries. For example,
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if _pad_before is 16, then the first entry would start at 16.
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An entry with pos = 20 would in fact be written at position 4
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in the image file.
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_end_4gb: Indicates that the section ends at the 4GB boundary. This is
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used for x86 images, which want to use positions such that a
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memory address (like 0xff800000) is the first entry position.
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This causes _skip_at_start to be set to the starting memory
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address.
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_name_prefix: Prefix to add to the name of all entries within this
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section
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_entries: OrderedDict() of entries
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"""
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def __init__(self, name, node, test=False):
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global entry
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global Entry
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import entry
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from entry import Entry
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self._node = node
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self._size = None
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self._align_size = None
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self._pad_before = 0
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self._pad_after = 0
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self._pad_byte = 0
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self._sort = False
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self._skip_at_start = 0
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self._end_4gb = False
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self._name_prefix = ''
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self._entries = OrderedDict()
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if not test:
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self._ReadNode()
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self._ReadEntries()
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def _ReadNode(self):
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"""Read properties from the section node"""
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self._size = fdt_util.GetInt(self._node, 'size')
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self._align_size = fdt_util.GetInt(self._node, 'align-size')
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if tools.NotPowerOfTwo(self._align_size):
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self._Raise("Alignment size %s must be a power of two" %
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self._align_size)
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self._pad_before = fdt_util.GetInt(self._node, 'pad-before', 0)
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self._pad_after = fdt_util.GetInt(self._node, 'pad-after', 0)
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self._pad_byte = fdt_util.GetInt(self._node, 'pad-byte', 0)
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self._sort = fdt_util.GetBool(self._node, 'sort-by-pos')
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self._end_4gb = fdt_util.GetBool(self._node, 'end-at-4gb')
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if self._end_4gb and not self._size:
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self._Raise("Section size must be provided when using end-at-4gb")
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if self._end_4gb:
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self._skip_at_start = 0x100000000 - self._size
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self._name_prefix = fdt_util.GetString(self._node, 'name-prefix')
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def _ReadEntries(self):
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for node in self._node.subnodes:
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entry = Entry.Create(self, node)
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entry.SetPrefix(self._name_prefix)
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self._entries[node.name] = entry
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def AddMissingProperties(self):
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for entry in self._entries.values():
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entry.AddMissingProperties()
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def SetCalculatedProperties(self):
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for entry in self._entries.values():
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entry.SetCalculatedProperties()
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def ProcessFdt(self, fdt):
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todo = self._entries.values()
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for passnum in range(3):
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next_todo = []
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for entry in todo:
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if not entry.ProcessFdt(fdt):
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next_todo.append(entry)
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todo = next_todo
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if not todo:
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break
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if todo:
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self._Raise('Internal error: Could not complete processing of Fdt: '
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'remaining %s' % todo)
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return True
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def CheckSize(self):
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"""Check that the section contents does not exceed its size, etc."""
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contents_size = 0
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for entry in self._entries.values():
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contents_size = max(contents_size, entry.pos + entry.size)
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contents_size -= self._skip_at_start
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size = self._size
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if not size:
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size = self._pad_before + contents_size + self._pad_after
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size = tools.Align(size, self._align_size)
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if self._size and contents_size > self._size:
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self._Raise("contents size %#x (%d) exceeds section size %#x (%d)" %
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(contents_size, contents_size, self._size, self._size))
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if not self._size:
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self._size = size
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if self._size != tools.Align(self._size, self._align_size):
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self._Raise("Size %#x (%d) does not match align-size %#x (%d)" %
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(self._size, self._size, self._align_size, self._align_size))
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return size
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def _Raise(self, msg):
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"""Raises an error for this section
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Args:
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msg: Error message to use in the raise string
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Raises:
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ValueError()
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"""
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raise ValueError("Section '%s': %s" % (self._node.path, msg))
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def GetPath(self):
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"""Get the path of an image (in the FDT)
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Returns:
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Full path of the node for this image
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"""
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return self._node.path
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def FindEntryType(self, etype):
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"""Find an entry type in the section
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Args:
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etype: Entry type to find
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Returns:
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entry matching that type, or None if not found
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"""
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for entry in self._entries.values():
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if entry.etype == etype:
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return entry
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return None
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def GetEntryContents(self):
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"""Call ObtainContents() for each entry
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This calls each entry's ObtainContents() a few times until they all
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return True. We stop calling an entry's function once it returns
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True. This allows the contents of one entry to depend on another.
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After 3 rounds we give up since it's likely an error.
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"""
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todo = self._entries.values()
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for passnum in range(3):
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next_todo = []
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for entry in todo:
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if not entry.ObtainContents():
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next_todo.append(entry)
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todo = next_todo
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if not todo:
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break
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if todo:
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self._Raise('Internal error: Could not complete processing of '
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'contents: remaining %s' % todo)
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return True
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def _SetEntryPosSize(self, name, pos, size):
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"""Set the position and size of an entry
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Args:
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name: Entry name to update
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pos: New position
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size: New size
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"""
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entry = self._entries.get(name)
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if not entry:
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self._Raise("Unable to set pos/size for unknown entry '%s'" % name)
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entry.SetPositionSize(self._skip_at_start + pos, size)
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def GetEntryPositions(self):
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"""Handle entries that want to set the position/size of other entries
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This calls each entry's GetPositions() method. If it returns a list
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of entries to update, it updates them.
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"""
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for entry in self._entries.values():
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pos_dict = entry.GetPositions()
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for name, info in pos_dict.iteritems():
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self._SetEntryPosSize(name, *info)
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def PackEntries(self):
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"""Pack all entries into the section"""
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pos = self._skip_at_start
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for entry in self._entries.values():
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pos = entry.Pack(pos)
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def _SortEntries(self):
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"""Sort entries by position"""
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entries = sorted(self._entries.values(), key=lambda entry: entry.pos)
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self._entries.clear()
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for entry in entries:
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self._entries[entry._node.name] = entry
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def CheckEntries(self):
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"""Check that entries do not overlap or extend outside the section"""
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if self._sort:
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self._SortEntries()
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pos = 0
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prev_name = 'None'
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for entry in self._entries.values():
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entry.CheckPosition()
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if (entry.pos < self._skip_at_start or
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entry.pos >= self._skip_at_start + self._size):
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entry.Raise("Position %#x (%d) is outside the section starting "
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"at %#x (%d)" %
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(entry.pos, entry.pos, self._skip_at_start,
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self._skip_at_start))
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if entry.pos < pos:
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entry.Raise("Position %#x (%d) overlaps with previous entry '%s' "
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"ending at %#x (%d)" %
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(entry.pos, entry.pos, prev_name, pos, pos))
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pos = entry.pos + entry.size
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prev_name = entry.GetPath()
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def ProcessEntryContents(self):
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"""Call the ProcessContents() method for each entry
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This is intended to adjust the contents as needed by the entry type.
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"""
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for entry in self._entries.values():
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entry.ProcessContents()
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def WriteSymbols(self):
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"""Write symbol values into binary files for access at run time"""
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for entry in self._entries.values():
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entry.WriteSymbols(self)
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def BuildSection(self, fd, base_pos):
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"""Write the section to a file"""
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fd.seek(base_pos)
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fd.write(self.GetData())
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def GetData(self):
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"""Write the section to a file"""
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section_data = chr(self._pad_byte) * self._size
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for entry in self._entries.values():
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data = entry.GetData()
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base = self._pad_before + entry.pos - self._skip_at_start
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section_data = (section_data[:base] + data +
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section_data[base + len(data):])
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return section_data
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def LookupSymbol(self, sym_name, optional, msg):
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"""Look up a symbol in an ELF file
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Looks up a symbol in an ELF file. Only entry types which come from an
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ELF image can be used by this function.
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At present the only entry property supported is pos.
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Args:
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sym_name: Symbol name in the ELF file to look up in the format
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_binman_<entry>_prop_<property> where <entry> is the name of
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the entry and <property> is the property to find (e.g.
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_binman_u_boot_prop_pos). As a special case, you can append
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_any to <entry> to have it search for any matching entry. E.g.
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_binman_u_boot_any_prop_pos will match entries called u-boot,
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u-boot-img and u-boot-nodtb)
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optional: True if the symbol is optional. If False this function
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will raise if the symbol is not found
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msg: Message to display if an error occurs
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Returns:
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Value that should be assigned to that symbol, or None if it was
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optional and not found
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Raises:
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ValueError if the symbol is invalid or not found, or references a
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property which is not supported
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"""
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m = re.match(r'^_binman_(\w+)_prop_(\w+)$', sym_name)
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if not m:
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raise ValueError("%s: Symbol '%s' has invalid format" %
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(msg, sym_name))
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entry_name, prop_name = m.groups()
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entry_name = entry_name.replace('_', '-')
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entry = self._entries.get(entry_name)
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if not entry:
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if entry_name.endswith('-any'):
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root = entry_name[:-4]
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for name in self._entries:
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if name.startswith(root):
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rest = name[len(root):]
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if rest in ['', '-img', '-nodtb']:
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entry = self._entries[name]
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if not entry:
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err = ("%s: Entry '%s' not found in list (%s)" %
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(msg, entry_name, ','.join(self._entries.keys())))
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if optional:
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print('Warning: %s' % err, file=sys.stderr)
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return None
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raise ValueError(err)
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if prop_name == 'pos':
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return entry.pos
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else:
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raise ValueError("%s: No such property '%s'" % (msg, prop_name))
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def GetEntries(self):
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return self._entries
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def WriteMap(self, fd, indent):
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"""Write a map of the section to a .map file
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Args:
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fd: File to write the map to
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"""
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for entry in self._entries.values():
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entry.WriteMap(fd, indent)
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