tools/binman/image.py

   1 # SPDX-License-Identifier: GPL-2.0+
   2 # Copyright (c) 2016 Google, Inc
   3 # Written by Simon Glass <sjg@chromium.org>
   4 #
   5 # Class for an image, the output of binman
   6 #
   7
   8 from __future__ import print_function
   9
  10 from collections import OrderedDict
  11 from operator import attrgetter
  12 import re
  13 import sys
  14
  15 import fdt_util
  16 import bsection
  17 import tools
  18
  19 class Image:
  20     """A Image, representing an output from binman
  21
  22     An image is comprised of a collection of entries each containing binary
  23     data. The image size must be large enough to hold all of this data.
  24
  25     This class implements the various operations needed for images.
  26
  27     Atrtributes:
  28         _node: Node object that contains the image definition in device tree
  29         _name: Image name
  30         _size: Image size in bytes, or None if not known yet
  31         _filename: Output filename for image
  32         _sections: Sections present in this image (may be one or more)
  33
  34     Args:
  35         test: True if this is being called from a test of Images. This this case
  36             there is no device tree defining the structure of the section, so
  37             we create a section manually.
  38     """
  39     def __init__(self, name, node, test=False):
  40         self._node = node
  41         self._name = name
  42         self._size = None
  43         self._filename = '%s.bin' % self._name
  44         if test:
  45             self._section = bsection.Section('main-section', self._node, True)
  46         else:
  47             self._ReadNode()
  48
  49     def _ReadNode(self):
  50         """Read properties from the image node"""
  51         self._size = fdt_util.GetInt(self._node, 'size')
  52         filename = fdt_util.GetString(self._node, 'filename')
  53         if filename:
  54             self._filename = filename
  55         self._section = bsection.Section('main-section', self._node)
  56
  57     def GetFdtSet(self):
  58         """Get the set of device tree files used by this image"""
  59         return self._section.GetFdtSet()
  60
  61     def AddMissingProperties(self):
  62         """Add properties that are not present in the device tree
  63
  64         When binman has completed packing the entries the offset and size of
  65         each entry are known. But before this the device tree may not specify
  66         these. Add any missing properties, with a dummy value, so that the
  67         size of the entry is correct. That way we can insert the correct values
  68         later.
  69         """
  70         self._section.AddMissingProperties()
  71
  72     def ProcessFdt(self, fdt):
  73         """Allow entries to adjust the device tree
  74
  75         Some entries need to adjust the device tree for their purposes. This
  76         may involve adding or deleting properties.
  77         """
  78         return self._section.ProcessFdt(fdt)
  79
  80     def GetEntryContents(self):
  81         """Call ObtainContents() for the section
  82         """
  83         self._section.GetEntryContents()
  84
  85     def GetEntryOffsets(self):
  86         """Handle entries that want to set the offset/size of other entries
  87
  88         This calls each entry's GetOffsets() method. If it returns a list
  89         of entries to update, it updates them.
  90         """
  91         self._section.GetEntryOffsets()
  92
  93     def PackEntries(self):
  94         """Pack all entries into the image"""
  95         self._section.PackEntries()
  96
  97     def CheckSize(self):
  98         """Check that the image contents does not exceed its size, etc."""
  99         self._size = self._section.CheckSize()
 100
 101     def CheckEntries(self):
 102         """Check that entries do not overlap or extend outside the image"""
 103         self._section.CheckEntries()
 104
 105     def SetCalculatedProperties(self):
 106         self._section.SetCalculatedProperties()
 107
 108     def SetImagePos(self):
 109         self._section.SetImagePos(0)
 110
 111     def ProcessEntryContents(self):
 112         """Call the ProcessContents() method for each entry
 113
 114         This is intended to adjust the contents as needed by the entry type.
 115         """
 116         self._section.ProcessEntryContents()
 117
 118     def WriteSymbols(self):
 119         """Write symbol values into binary files for access at run time"""
 120         self._section.WriteSymbols()
 121
 122     def BuildImage(self):
 123         """Write the image to a file"""
 124         fname = tools.GetOutputFilename(self._filename)
 125         with open(fname, 'wb') as fd:
 126             self._section.BuildSection(fd, 0)
 127
 128     def GetEntries(self):
 129         return self._section.GetEntries()
 130
 131     def WriteMap(self):
 132         """Write a map of the image to a .map file"""
 133         filename = '%s.map' % self._name
 134         fname = tools.GetOutputFilename(filename)
 135         with open(fname, 'w') as fd:
 136             print('%8s  %8s  %8s  %s' % ('ImagePos', 'Offset', 'Size', 'Name'),
 137                   file=fd)
 138             self._section.WriteMap(fd, 0)