blob: 0278f87df22d51a08e746369811940d82c8b4d61 [file] [log] [blame]
# SPDX-License-Identifier: GPL-2.0+
# Copyright 2018 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
# Holds and modifies the state information held by binman
#
import hashlib
import re
import os
import tools
# Records the device-tree files known to binman, keyed by entry type (e.g.
# 'u-boot-spl-dtb'). These are the output FDT files, which can be updated by
# binman. They have been copied to <xxx>.out files.
#
# key: entry type
# value: tuple:
# Fdt object
# Filename
output_fdt_files = {}
# Arguments passed to binman to provide arguments to entries
entry_args = {}
# True to use fake device-tree files for testing (see U_BOOT_DTB_DATA in
# ftest.py)
use_fake_dtb = False
# Dict of device trees, keyed by entry type, but excluding the main one
# The value is as returned by Entry.GetFdts(), i.e. a tuple:
# Fdt object for this dtb, or None if not available
# Filename of file containing this dtb
fdt_subset = {}
# The DTB which contains the full image information
main_dtb = None
# Allow entries to expand after they have been packed. This is detected and
# forces a re-pack. If not allowed, any attempted expansion causes an error in
# Entry.ProcessContentsUpdate()
allow_entry_expansion = True
def GetFdtForEtype(etype):
"""Get the Fdt object for a particular device-tree entry
Binman keeps track of at least one device-tree file called u-boot.dtb but
can also have others (e.g. for SPL). This function looks up the given
entry and returns the associated Fdt object.
Args:
etype: Entry type of device tree (e.g. 'u-boot-dtb')
Returns:
Fdt object associated with the entry type
"""
return output_fdt_files[etype][0]
def GetFdtPath(etype):
"""Get the full pathname of a particular Fdt object
Similar to GetFdtForEtype() but returns the pathname associated with the
Fdt.
Args:
etype: Entry type of device tree (e.g. 'u-boot-dtb')
Returns:
Full path name to the associated Fdt
"""
return output_fdt_files[etype][0]._fname
def GetFdtContents(etype='u-boot-dtb'):
"""Looks up the FDT pathname and contents
This is used to obtain the Fdt pathname and contents when needed by an
entry. It supports a 'fake' dtb, allowing tests to substitute test data for
the real dtb.
Args:
etype: Entry type to look up (e.g. 'u-boot.dtb').
Returns:
tuple:
pathname to Fdt
Fdt data (as bytes)
"""
if etype in output_fdt_files and not use_fake_dtb:
pathname = GetFdtPath(etype)
data = GetFdtForEtype(etype).GetContents()
else:
fname = output_fdt_files[etype][1]
pathname = tools.GetInputFilename(fname)
data = tools.ReadFile(pathname)
return pathname, data
def SetEntryArgs(args):
"""Set the value of the entry args
This sets up the entry_args dict which is used to supply entry arguments to
entries.
Args:
args: List of entry arguments, each in the format "name=value"
"""
global entry_args
entry_args = {}
if args:
for arg in args:
m = re.match('([^=]*)=(.*)', arg)
if not m:
raise ValueError("Invalid entry arguemnt '%s'" % arg)
entry_args[m.group(1)] = m.group(2)
def GetEntryArg(name):
"""Get the value of an entry argument
Args:
name: Name of argument to retrieve
Returns:
String value of argument
"""
return entry_args.get(name)
def Prepare(images, dtb):
"""Get device tree files ready for use
This sets up a set of device tree files that can be retrieved by
GetAllFdts(). This includes U-Boot proper and any SPL device trees.
Args:
images: List of images being used
dtb: Main dtb
"""
global fdt_set, fdt_subset, output_fdt_files, main_dtb
# Import these here in case libfdt.py is not available, in which case
# the above help option still works.
import fdt
import fdt_util
# If we are updating the DTBs we need to put these updated versions
# where Entry_blob_dtb can find them. We can ignore 'u-boot.dtb'
# since it is assumed to be the one passed in with options.dt, and
# was handled just above.
main_dtb = dtb
output_fdt_files.clear()
output_fdt_files['u-boot-dtb'] = [dtb, 'u-boot.dtb']
output_fdt_files['u-boot-spl-dtb'] = [dtb, 'spl/u-boot-spl.dtb']
output_fdt_files['u-boot-tpl-dtb'] = [dtb, 'tpl/u-boot-tpl.dtb']
fdt_subset = {}
if not use_fake_dtb:
for image in images.values():
fdt_subset.update(image.GetFdts())
if 'u-boot-dtb' in fdt_subset:
del fdt_subset['u-boot-dtb']
for etype, other in fdt_subset.items():
_, other_fname = other
infile = tools.GetInputFilename(other_fname)
other_fname_dtb = fdt_util.EnsureCompiled(infile)
out_fname = tools.GetOutputFilename('%s.out' %
os.path.split(other_fname)[1])
tools.WriteFile(out_fname, tools.ReadFile(other_fname_dtb))
other_dtb = fdt.FdtScan(out_fname)
output_fdt_files[etype] = [other_dtb, other_fname]
def GetAllFdts():
"""Yield all device tree files being used by binman
Yields:
Device trees being used (U-Boot proper, SPL, TPL)
"""
yield main_dtb
for etype in fdt_subset:
yield output_fdt_files[etype][0]
def GetUpdateNodes(node):
"""Yield all the nodes that need to be updated in all device trees
The property referenced by this node is added to any device trees which
have the given node. Due to removable of unwanted notes, SPL and TPL may
not have this node.
Args:
node: Node object in the main device tree to look up
Yields:
Node objects in each device tree that is in use (U-Boot proper, which
is node, SPL and TPL)
"""
yield node
for dtb, fname in output_fdt_files.values():
if dtb != node.GetFdt():
other_node = dtb.GetNode(node.path)
if other_node:
yield other_node
def AddZeroProp(node, prop):
"""Add a new property to affected device trees with an integer value of 0.
Args:
prop_name: Name of property
"""
for n in GetUpdateNodes(node):
n.AddZeroProp(prop)
def AddSubnode(node, name):
"""Add a new subnode to a node in affected device trees
Args:
node: Node to add to
name: name of node to add
Returns:
New subnode that was created in main tree
"""
first = None
for n in GetUpdateNodes(node):
subnode = n.AddSubnode(name)
if not first:
first = subnode
return first
def AddString(node, prop, value):
"""Add a new string property to affected device trees
Args:
prop_name: Name of property
value: String value (which will be \0-terminated in the DT)
"""
for n in GetUpdateNodes(node):
n.AddString(prop, value)
def SetInt(node, prop, value):
"""Update an integer property in affected device trees with an integer value
This is not allowed to change the size of the FDT.
Args:
prop_name: Name of property
"""
for n in GetUpdateNodes(node):
n.SetInt(prop, value)
def CheckAddHashProp(node):
hash_node = node.FindNode('hash')
if hash_node:
algo = hash_node.props.get('algo')
if not algo:
return "Missing 'algo' property for hash node"
if algo.value == 'sha256':
size = 32
else:
return "Unknown hash algorithm '%s'" % algo
for n in GetUpdateNodes(hash_node):
n.AddEmptyProp('value', size)
def CheckSetHashValue(node, get_data_func):
hash_node = node.FindNode('hash')
if hash_node:
algo = hash_node.props.get('algo').value
if algo == 'sha256':
m = hashlib.sha256()
m.update(get_data_func())
data = m.digest()
for n in GetUpdateNodes(hash_node):
n.SetData('value', data)
def SetAllowEntryExpansion(allow):
"""Set whether post-pack expansion of entries is allowed
Args:
allow: True to allow expansion, False to raise an exception
"""
global allow_entry_expansion
allow_entry_expansion = allow
def AllowEntryExpansion():
"""Check whether post-pack expansion of entries is allowed
Returns:
True if expansion should be allowed, False if an exception should be
raised
"""
return allow_entry_expansion