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# SPDX-License-Identifier: GPL-2.0+
# Copyright 2019 Google LLC
# Written by Simon Glass <sjg@chromium.org>
#
# Entry-type module for a Coreboot Filesystem (CBFS)
#
from collections import OrderedDict
import cbfs_util
from cbfs_util import CbfsWriter
from entry import Entry
import fdt_util
import state
class Entry_cbfs(Entry):
"""Entry containing a Coreboot Filesystem (CBFS)
A CBFS provides a way to group files into a group. It has a simple directory
structure and allows the position of individual files to be set, since it is
designed to support execute-in-place in an x86 SPI-flash device. Where XIP
is not used, it supports compression and storing ELF files.
CBFS is used by coreboot as its way of orgnanising SPI-flash contents.
The contents of the CBFS are defined by subnodes of the cbfs entry, e.g.:
cbfs {
size = <0x100000>;
u-boot {
cbfs-type = "raw";
};
u-boot-dtb {
cbfs-type = "raw";
};
};
This creates a CBFS 1MB in size two files in it: u-boot.bin and u-boot.dtb.
Note that the size is required since binman does not support calculating it.
The contents of each entry is just what binman would normally provide if it
were not a CBFS node. A blob type can be used to import arbitrary files as
with the second subnode below:
cbfs {
size = <0x100000>;
u-boot {
cbfs-name = "BOOT";
cbfs-type = "raw";
};
dtb {
type = "blob";
filename = "u-boot.dtb";
cbfs-type = "raw";
cbfs-compress = "lz4";
cbfs-offset = <0x100000>;
};
};
This creates a CBFS 1MB in size with u-boot.bin (named "BOOT") and
u-boot.dtb (named "dtb") and compressed with the lz4 algorithm.
Properties supported in the top-level CBFS node:
cbfs-arch:
Defaults to "x86", but you can specify the architecture if needed.
Properties supported in the CBFS entry subnodes:
cbfs-name:
This is the name of the file created in CBFS. It defaults to the entry
name (which is the node name), but you can override it with this
property.
cbfs-type:
This is the CBFS file type. The following are supported:
raw:
This is a 'raw' file, although compression is supported. It can be
used to store any file in CBFS.
stage:
This is an ELF file that has been loaded (i.e. mapped to memory), so
appears in the CBFS as a flat binary. The input file must be an ELF
image, for example this puts "u-boot" (the ELF image) into a 'stage'
entry:
cbfs {
size = <0x100000>;
u-boot-elf {
cbfs-name = "BOOT";
cbfs-type = "stage";
};
};
You can use your own ELF file with something like:
cbfs {
size = <0x100000>;
something {
type = "blob";
filename = "cbfs-stage.elf";
cbfs-type = "stage";
};
};
As mentioned, the file is converted to a flat binary, so it is
equivalent to adding "u-boot.bin", for example, but with the load and
start addresses specified by the ELF. At present there is no option
to add a flat binary with a load/start address, similar to the
'add-flat-binary' option in cbfstool.
cbfs-offset:
This is the offset of the file's data within the CBFS. It is used to
specify where the file should be placed in cases where a fixed position
is needed. Typical uses are for code which is not relocatable and must
execute in-place from a particular address. This works because SPI flash
is generally mapped into memory on x86 devices. The file header is
placed before this offset so that the data start lines up exactly with
the chosen offset. If this property is not provided, then the file is
placed in the next available spot.
The current implementation supports only a subset of CBFS features. It does
not support other file types (e.g. payload), adding multiple files (like the
'files' entry with a pattern supported by binman), putting files at a
particular offset in the CBFS and a few other things.
Of course binman can create images containing multiple CBFSs, simply by
defining these in the binman config:
binman {
size = <0x800000>;
cbfs {
offset = <0x100000>;
size = <0x100000>;
u-boot {
cbfs-type = "raw";
};
u-boot-dtb {
cbfs-type = "raw";
};
};
cbfs2 {
offset = <0x700000>;
size = <0x100000>;
u-boot {
cbfs-type = "raw";
};
u-boot-dtb {
cbfs-type = "raw";
};
image {
type = "blob";
filename = "image.jpg";
};
};
};
This creates an 8MB image with two CBFSs, one at offset 1MB, one at 7MB,
both of size 1MB.
"""
def __init__(self, section, etype, node):
Entry.__init__(self, section, etype, node)
self._cbfs_arg = fdt_util.GetString(node, 'cbfs-arch', 'x86')
self._cbfs_entries = OrderedDict()
self._ReadSubnodes()
self.reader = None
def ObtainContents(self, skip=None):
arch = cbfs_util.find_arch(self._cbfs_arg)
if arch is None:
self.Raise("Invalid architecture '%s'" % self._cbfs_arg)
if self.size is None:
self.Raise("'cbfs' entry must have a size property")
cbfs = CbfsWriter(self.size, arch)
for entry in self._cbfs_entries.values():
# First get the input data and put it in a file. If not available,
# try later.
if entry != skip and not entry.ObtainContents():
return False
data = entry.GetData()
cfile = None
if entry._type == 'raw':
cfile = cbfs.add_file_raw(entry._cbfs_name, data,
entry._cbfs_offset,
entry._cbfs_compress)
elif entry._type == 'stage':
cfile = cbfs.add_file_stage(entry._cbfs_name, data,
entry._cbfs_offset)
else:
entry.Raise("Unknown cbfs-type '%s' (use 'raw', 'stage')" %
entry._type)
if cfile:
entry._cbfs_file = cfile
data = cbfs.get_data()
self.SetContents(data)
return True
def _ReadSubnodes(self):
"""Read the subnodes to find out what should go in this IFWI"""
for node in self._node.subnodes:
entry = Entry.Create(self, node)
entry.ReadNode()
entry._cbfs_name = fdt_util.GetString(node, 'cbfs-name', entry.name)
entry._type = fdt_util.GetString(node, 'cbfs-type')
compress = fdt_util.GetString(node, 'cbfs-compress', 'none')
entry._cbfs_offset = fdt_util.GetInt(node, 'cbfs-offset')
entry._cbfs_compress = cbfs_util.find_compress(compress)
if entry._cbfs_compress is None:
self.Raise("Invalid compression in '%s': '%s'" %
(node.name, compress))
self._cbfs_entries[entry._cbfs_name] = entry
def SetImagePos(self, image_pos):
"""Override this function to set all the entry properties from CBFS
We can only do this once image_pos is known
Args:
image_pos: Position of this entry in the image
"""
Entry.SetImagePos(self, image_pos)
# Now update the entries with info from the CBFS entries
for entry in self._cbfs_entries.values():
cfile = entry._cbfs_file
entry.size = cfile.data_len
entry.offset = cfile.calced_cbfs_offset
entry.image_pos = self.image_pos + entry.offset
if entry._cbfs_compress:
entry.uncomp_size = cfile.memlen
def AddMissingProperties(self):
Entry.AddMissingProperties(self)
for entry in self._cbfs_entries.values():
entry.AddMissingProperties()
if entry._cbfs_compress:
state.AddZeroProp(entry._node, 'uncomp-size')
# Store the 'compress' property, since we don't look at
# 'cbfs-compress' in Entry.ReadData()
state.AddString(entry._node, 'compress',
cbfs_util.compress_name(entry._cbfs_compress))
def SetCalculatedProperties(self):
"""Set the value of device-tree properties calculated by binman"""
Entry.SetCalculatedProperties(self)
for entry in self._cbfs_entries.values():
state.SetInt(entry._node, 'offset', entry.offset)
state.SetInt(entry._node, 'size', entry.size)
state.SetInt(entry._node, 'image-pos', entry.image_pos)
if entry.uncomp_size is not None:
state.SetInt(entry._node, 'uncomp-size', entry.uncomp_size)
def ListEntries(self, entries, indent):
"""Override this method to list all files in the section"""
Entry.ListEntries(self, entries, indent)
for entry in self._cbfs_entries.values():
entry.ListEntries(entries, indent + 1)
def GetEntries(self):
return self._cbfs_entries
def ReadData(self, decomp=True):
data = Entry.ReadData(self, True)
return data
def ReadChildData(self, child, decomp=True):
if not self.reader:
data = Entry.ReadData(self, True)
self.reader = cbfs_util.CbfsReader(data)
reader = self.reader
cfile = reader.files.get(child.name)
return cfile.data if decomp else cfile.orig_data
def WriteChildData(self, child):
self.ObtainContents(skip=child)
return True