platform_external_dtc/pylibfdt/libfdt.i
David Gibson 1e4a0928f3 pylibfdt: Don't have setup.py depend on where it's invoked from
Currently setup.py depends on being invoked from the right directory
(specifically it needs to be run from the root of the project).  That's a
bit confusing.

This updates setup.py to no longer depend on the invoking directory by
instead having it change directory to the location of the script itself,
then using internal paths relative to that.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Simon Glass <sjg@chromium.org>
2018-09-25 10:31:54 +10:00

1137 lines
34 KiB
OpenEdge ABL

/*
* pylibfdt - Flat Device Tree manipulation in Python
* Copyright (C) 2017 Google, Inc.
* Written by Simon Glass <sjg@chromium.org>
*
* libfdt is dual licensed: you can use it either under the terms of
* the GPL, or the BSD license, at your option.
*
* a) This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* Alternatively,
*
* b) Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
%module libfdt
%include <stdint.i>
%{
#define SWIG_FILE_WITH_INIT
#include "libfdt.h"
/*
* We rename this function here to avoid problems with swig, since we also have
* a struct called fdt_property. That struct causes swig to create a class in
* libfdt.py called fdt_property(), which confuses things.
*/
static int fdt_property_stub(void *fdt, const char *name, const char *val,
int len)
{
return fdt_property(fdt, name, val, len);
}
%}
%pythoncode %{
import struct
# Error codes, corresponding to FDT_ERR_... in libfdt.h
(NOTFOUND,
EXISTS,
NOSPACE,
BADOFFSET,
BADPATH,
BADPHANDLE,
BADSTATE,
TRUNCATED,
BADMAGIC,
BADVERSION,
BADSTRUCTURE,
BADLAYOUT,
INTERNAL,
BADNCELLS,
BADVALUE,
BADOVERLAY,
NOPHANDLES) = QUIET_ALL = range(1, 18)
# QUIET_ALL can be passed as the 'quiet' parameter to avoid exceptions
# altogether. All # functions passed this value will return an error instead
# of raising an exception.
# Pass this as the 'quiet' parameter to return -ENOTFOUND on NOTFOUND errors,
# instead of raising an exception.
QUIET_NOTFOUND = (NOTFOUND,)
QUIET_NOSPACE = (NOSPACE,)
class FdtException(Exception):
"""An exception caused by an error such as one of the codes above"""
def __init__(self, err):
self.err = err
def __str__(self):
return 'pylibfdt error %d: %s' % (self.err, fdt_strerror(self.err))
def strerror(fdt_err):
"""Get the string for an error number
Args:
fdt_err: Error number (-ve)
Returns:
String containing the associated error
"""
return fdt_strerror(fdt_err)
def check_err(val, quiet=()):
"""Raise an error if the return value is -ve
This is used to check for errors returned by libfdt C functions.
Args:
val: Return value from a libfdt function
quiet: Errors to ignore (empty to raise on all errors)
Returns:
val if val >= 0
Raises
FdtException if val < 0
"""
if val < 0:
if -val not in quiet:
raise FdtException(val)
return val
def check_err_null(val, quiet=()):
"""Raise an error if the return value is NULL
This is used to check for a NULL return value from certain libfdt C
functions
Args:
val: Return value from a libfdt function
quiet: Errors to ignore (empty to raise on all errors)
Returns:
val if val is a list, None if not
Raises
FdtException if val indicates an error was reported and the error
is not in @quiet.
"""
# Normally a list is returned which contains the data and its length.
# If we get just an integer error code, it means the function failed.
if not isinstance(val, list):
if -val not in quiet:
raise FdtException(val)
return val
class FdtRo(object):
"""Class for a read-only device-tree
This is a base class used by FdtRw (read-write access) and FdtSw
(sequential-write access). It implements read-only access to the
device tree.
Here are the three classes and when you should use them:
FdtRo - read-only access to an existing FDT
FdtRw - read-write access to an existing FDT (most common case)
FdtSw - for creating a new FDT, as well as allowing read-only access
"""
def __init__(self, data):
self._fdt = bytearray(data)
check_err(fdt_check_header(self._fdt));
def as_bytearray(self):
"""Get the device tree contents as a bytearray
This can be passed directly to libfdt functions that access a
const void * for the device tree.
Returns:
bytearray containing the device tree
"""
return bytearray(self._fdt)
def next_node(self, nodeoffset, depth, quiet=()):
"""Find the next subnode
Args:
nodeoffset: Node offset of previous node
depth: The depth of the node at nodeoffset. This is used to
calculate the depth of the returned node
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Typle:
Offset of the next node, if any, else a -ve error
Depth of the returned node, if any, else undefined
Raises:
FdtException if no more nodes found or other error occurs
"""
return check_err(fdt_next_node(self._fdt, nodeoffset, depth), quiet)
def first_subnode(self, nodeoffset, quiet=()):
"""Find the first subnode of a parent node
Args:
nodeoffset: Node offset of parent node
quiet: Errors to ignore (empty to raise on all errors)
Returns:
The offset of the first subnode, if any
Raises:
FdtException if no subnodes found or other error occurs
"""
return check_err(fdt_first_subnode(self._fdt, nodeoffset), quiet)
def next_subnode(self, nodeoffset, quiet=()):
"""Find the next subnode
Args:
nodeoffset: Node offset of previous subnode
quiet: Errors to ignore (empty to raise on all errors)
Returns:
The offset of the next subnode, if any
Raises:
FdtException if no more subnodes found or other error occurs
"""
return check_err(fdt_next_subnode(self._fdt, nodeoffset), quiet)
def magic(self):
"""Return the magic word from the header
Returns:
Magic word
"""
return fdt_magic(self._fdt)
def totalsize(self):
"""Return the total size of the device tree
Returns:
Total tree size in bytes
"""
return fdt_totalsize(self._fdt)
def off_dt_struct(self):
"""Return the start of the device-tree struct area
Returns:
Start offset of struct area
"""
return fdt_off_dt_struct(self._fdt)
def off_dt_strings(self):
"""Return the start of the device-tree string area
Returns:
Start offset of string area
"""
return fdt_off_dt_strings(self._fdt)
def off_mem_rsvmap(self):
"""Return the start of the memory reserve map
Returns:
Start offset of memory reserve map
"""
return fdt_off_mem_rsvmap(self._fdt)
def version(self):
"""Return the version of the device tree
Returns:
Version number of the device tree
"""
return fdt_version(self._fdt)
def last_comp_version(self):
"""Return the last compatible version of the device tree
Returns:
Last compatible version number of the device tree
"""
return fdt_last_comp_version(self._fdt)
def boot_cpuid_phys(self):
"""Return the physical boot CPU ID
Returns:
Physical boot CPU ID
"""
return fdt_boot_cpuid_phys(self._fdt)
def size_dt_strings(self):
"""Return the start of the device-tree string area
Returns:
Start offset of string area
"""
return fdt_size_dt_strings(self._fdt)
def size_dt_struct(self):
"""Return the start of the device-tree struct area
Returns:
Start offset of struct area
"""
return fdt_size_dt_struct(self._fdt)
def num_mem_rsv(self, quiet=()):
"""Return the number of memory reserve-map records
Returns:
Number of memory reserve-map records
"""
return check_err(fdt_num_mem_rsv(self._fdt), quiet)
def get_mem_rsv(self, index, quiet=()):
"""Return the indexed memory reserve-map record
Args:
index: Record to return (0=first)
Returns:
Number of memory reserve-map records
"""
return check_err(fdt_get_mem_rsv(self._fdt, index), quiet)
def subnode_offset(self, parentoffset, name, quiet=()):
"""Get the offset of a named subnode
Args:
parentoffset: Offset of the parent node to check
name: Name of the required subnode, e.g. 'subnode@1'
quiet: Errors to ignore (empty to raise on all errors)
Returns:
The node offset of the found node, if any
Raises
FdtException if there is no node with that name, or other error
"""
return check_err(fdt_subnode_offset(self._fdt, parentoffset, name),
quiet)
def path_offset(self, path, quiet=()):
"""Get the offset for a given path
Args:
path: Path to the required node, e.g. '/node@3/subnode@1'
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Node offset
Raises
FdtException if the path is not valid or not found
"""
return check_err(fdt_path_offset(self._fdt, path), quiet)
def get_name(self, nodeoffset):
"""Get the name of a node
Args:
nodeoffset: Offset of node to check
Returns:
Node name
Raises:
FdtException on error (e.g. nodeoffset is invalid)
"""
return check_err_null(fdt_get_name(self._fdt, nodeoffset))[0]
def first_property_offset(self, nodeoffset, quiet=()):
"""Get the offset of the first property in a node offset
Args:
nodeoffset: Offset to the node to check
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Offset of the first property
Raises
FdtException if the associated node has no properties, or some
other error occurred
"""
return check_err(fdt_first_property_offset(self._fdt, nodeoffset),
quiet)
def next_property_offset(self, prop_offset, quiet=()):
"""Get the next property in a node
Args:
prop_offset: Offset of the previous property
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Offset of the next property
Raises:
FdtException if the associated node has no more properties, or
some other error occurred
"""
return check_err(fdt_next_property_offset(self._fdt, prop_offset),
quiet)
def get_property_by_offset(self, prop_offset, quiet=()):
"""Obtains a property that can be examined
Args:
prop_offset: Offset of property (e.g. from first_property_offset())
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Property object, or None if not found
Raises:
FdtException on error (e.g. invalid prop_offset or device
tree format)
"""
pdata = check_err_null(
fdt_get_property_by_offset(self._fdt, prop_offset), quiet)
if isinstance(pdata, (int)):
return pdata
return Property(pdata[0], pdata[1])
def getprop(self, nodeoffset, prop_name, quiet=()):
"""Get a property from a node
Args:
nodeoffset: Node offset containing property to get
prop_name: Name of property to get
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Value of property as a Property object (which can be used as a
bytearray/string), or -ve error number. On failure, returns an
integer error
Raises:
FdtError if any error occurs (e.g. the property is not found)
"""
pdata = check_err_null(fdt_getprop(self._fdt, nodeoffset, prop_name),
quiet)
if isinstance(pdata, (int)):
return pdata
return Property(prop_name, bytearray(pdata[0]))
def get_phandle(self, nodeoffset):
"""Get the phandle of a node
Args:
nodeoffset: Node offset to check
Returns:
phandle of node, or 0 if the node has no phandle or another error
occurs
"""
return fdt_get_phandle(self._fdt, nodeoffset)
def parent_offset(self, nodeoffset, quiet=()):
"""Get the offset of a node's parent
Args:
nodeoffset: Node offset to check
quiet: Errors to ignore (empty to raise on all errors)
Returns:
The offset of the parent node, if any
Raises:
FdtException if no parent found or other error occurs
"""
return check_err(fdt_parent_offset(self._fdt, nodeoffset), quiet)
def node_offset_by_phandle(self, phandle, quiet=()):
"""Get the offset of a node with the given phandle
Args:
phandle: Phandle to search for
quiet: Errors to ignore (empty to raise on all errors)
Returns:
The offset of node with that phandle, if any
Raises:
FdtException if no node found or other error occurs
"""
return check_err(fdt_node_offset_by_phandle(self._fdt, phandle), quiet)
class Fdt(FdtRo):
"""Device tree class, supporting all operations
The Fdt object is created is created from a device tree binary file,
e.g. with something like:
fdt = Fdt(open("filename.dtb").read())
Operations can then be performed using the methods in this class. Each
method xxx(args...) corresponds to a libfdt function fdt_xxx(fdt, args...).
All methods raise an FdtException if an error occurs. To avoid this
behaviour a 'quiet' parameter is provided for some functions. This
defaults to empty, but you can pass a list of errors that you expect.
If one of these errors occurs, the function will return an error number
(e.g. -NOTFOUND).
"""
def __init__(self, data):
FdtRo.__init__(self, data)
@staticmethod
def create_empty_tree(size, quiet=()):
"""Create an empty device tree ready for use
Args:
size: Size of device tree in bytes
Returns:
Fdt object containing the device tree
"""
data = bytearray(size)
err = check_err(fdt_create_empty_tree(data, size), quiet)
if err:
return err
return Fdt(data)
def resize(self, size, quiet=()):
"""Move the device tree into a larger or smaller space
This creates a new device tree of size @size and moves the existing
device tree contents over to that. It can be used to create more space
in a device tree. Note that the Fdt object remains the same, but it
now has a new bytearray holding the contents.
Args:
size: Required new size of device tree in bytes
"""
fdt = bytearray(size)
err = check_err(fdt_open_into(self._fdt, fdt, size), quiet)
if err:
return err
self._fdt = fdt
def pack(self, quiet=()):
"""Pack the device tree to remove unused space
This adjusts the tree in place.
Args:
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Error code, or 0 if OK
Raises:
FdtException if any error occurs
"""
err = check_err(fdt_pack(self._fdt), quiet)
if err:
return err
del self._fdt[self.totalsize():]
return err
def set_name(self, nodeoffset, name, quiet=()):
"""Set the name of a node
Args:
nodeoffset: Node offset of node to update
name: New node name (string without \0)
Returns:
Error code, or 0 if OK
Raises:
FdtException if no parent found or other error occurs
"""
if chr(0) in name:
raise ValueError('Property contains embedded nul characters')
return check_err(fdt_set_name(self._fdt, nodeoffset, name), quiet)
def setprop(self, nodeoffset, prop_name, val, quiet=()):
"""Set the value of a property
Args:
nodeoffset: Node offset containing the property to create/update
prop_name: Name of property
val: Value to write (string or bytearray)
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Error code, or 0 if OK
Raises:
FdtException if no parent found or other error occurs
"""
return check_err(fdt_setprop(self._fdt, nodeoffset, prop_name, val,
len(val)), quiet)
def setprop_u32(self, nodeoffset, prop_name, val, quiet=()):
"""Set the value of a property
Args:
nodeoffset: Node offset containing the property to create/update
prop_name: Name of property
val: Value to write (integer)
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Error code, or 0 if OK
Raises:
FdtException if no parent found or other error occurs
"""
return check_err(fdt_setprop_u32(self._fdt, nodeoffset, prop_name, val),
quiet)
def setprop_u64(self, nodeoffset, prop_name, val, quiet=()):
"""Set the value of a property
Args:
nodeoffset: Node offset containing the property to create/update
prop_name: Name of property
val: Value to write (integer)
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Error code, or 0 if OK
Raises:
FdtException if no parent found or other error occurs
"""
return check_err(fdt_setprop_u64(self._fdt, nodeoffset, prop_name, val),
quiet)
def setprop_str(self, nodeoffset, prop_name, val, quiet=()):
"""Set the string value of a property
The property is set to the string, with a nul terminator added
Args:
nodeoffset: Node offset containing the property to create/update
prop_name: Name of property
val: Value to write (string without nul terminator). Unicode is
supposed by encoding to UTF-8
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Error code, or 0 if OK
Raises:
FdtException if no parent found or other error occurs
"""
val = val.encode('utf-8') + '\0'
return check_err(fdt_setprop(self._fdt, nodeoffset, prop_name,
val, len(val)), quiet)
def delprop(self, nodeoffset, prop_name, quiet=()):
"""Delete a property from a node
Args:
nodeoffset: Node offset containing property to delete
prop_name: Name of property to delete
quiet: Errors to ignore (empty to raise on all errors)
Returns:
Error code, or 0 if OK
Raises:
FdtError if the property does not exist, or another error occurs
"""
return check_err(fdt_delprop(self._fdt, nodeoffset, prop_name), quiet)
def add_subnode(self, parentoffset, name, quiet=()):
"""Add a new subnode to a node
Args:
parentoffset: Parent offset to add the subnode to
name: Name of node to add
Returns:
offset of the node created, or negative error code on failure
Raises:
FdtError if there is not enough space, or another error occurs
"""
return check_err(fdt_add_subnode(self._fdt, parentoffset, name), quiet)
def del_node(self, nodeoffset, quiet=()):
"""Delete a node
Args:
nodeoffset: Offset of node to delete
Returns:
Error code, or 0 if OK
Raises:
FdtError if an error occurs
"""
return check_err(fdt_del_node(self._fdt, nodeoffset), quiet)
class Property(bytearray):
"""Holds a device tree property name and value.
This holds a copy of a property taken from the device tree. It does not
reference the device tree, so if anything changes in the device tree,
a Property object will remain valid.
Properties:
name: Property name
value: Property value as a bytearray
"""
def __init__(self, name, value):
bytearray.__init__(self, value)
self.name = name
def as_cell(self, fmt):
return struct.unpack('>' + fmt, self)[0]
def as_uint32(self):
return self.as_cell('L')
def as_int32(self):
return self.as_cell('l')
def as_uint64(self):
return self.as_cell('Q')
def as_int64(self):
return self.as_cell('q')
def as_str(self):
"""Unicode is supported by decoding from UTF-8"""
if self[-1] != 0:
raise ValueError('Property lacks nul termination')
if 0 in self[:-1]:
raise ValueError('Property contains embedded nul characters')
return self[:-1].decode('utf-8')
class FdtSw(FdtRo):
"""Software interface to create a device tree from scratch
The methods in this class work by adding to an existing 'partial' device
tree buffer of a fixed size created by instantiating this class. When the
tree is complete, call as_fdt() to obtain a device tree ready to be used.
Similarly with nodes, a new node is started with begin_node() and finished
with end_node().
The context manager functions can be used to make this a bit easier:
# First create the device tree with a node and property:
sw = FdtSw()
with sw.add_node('node'):
sw.property_u32('reg', 2)
fdt = sw.as_fdt()
# Now we can use it as a real device tree
fdt.setprop_u32(0, 'reg', 3)
The size hint provides a starting size for the space to be used by the
device tree. This will be increased automatically as needed as new items
are added to the tree.
"""
INC_SIZE = 1024 # Expand size by this much when out of space
def __init__(self, size_hint=None):
"""Create a new FdtSw object
Args:
size_hint: A hint as to the initial size to use
Raises:
ValueError if size_hint is negative
Returns:
FdtSw object on success, else integer error code (if not raising)
"""
if not size_hint:
size_hint = self.INC_SIZE
fdtsw = bytearray(size_hint)
err = check_err(fdt_create(fdtsw, size_hint))
if err:
return err
self._fdt = fdtsw
def as_fdt(self):
"""Convert a FdtSw into an Fdt so it can be accessed as normal
Creates a new Fdt object from the work-in-progress device tree. This
does not call fdt_finish() on the current object, so it is possible to
add more nodes/properties and call as_fdt() again to get an updated
tree.
Returns:
Fdt object allowing access to the newly created device tree
"""
fdtsw = bytearray(self._fdt)
check_err(fdt_finish(fdtsw))
return Fdt(fdtsw)
def check_space(self, val):
"""Check if we need to add more space to the FDT
This should be called with the error code from an operation. If this is
-NOSPACE then the FDT will be expanded to have more space, and True will
be returned, indicating that the operation needs to be tried again.
Args:
val: Return value from the operation that was attempted
Returns:
True if the operation must be retried, else False
"""
if check_err(val, QUIET_NOSPACE) < 0:
self.resize(len(self._fdt) + self.INC_SIZE)
return True
return False
def resize(self, size):
"""Resize the buffer to accommodate a larger tree
Args:
size: New size of tree
Raises:
FdtException on any error
"""
fdt = bytearray(size)
err = check_err(fdt_resize(self._fdt, fdt, size))
self._fdt = fdt
def add_reservemap_entry(self, addr, size):
"""Add a new memory reserve map entry
Once finished adding, you must call finish_reservemap().
Args:
addr: 64-bit start address
size: 64-bit size
Raises:
FdtException on any error
"""
while self.check_space(fdt_add_reservemap_entry(self._fdt, addr,
size)):
pass
def finish_reservemap(self):
"""Indicate that there are no more reserve map entries to add
Raises:
FdtException on any error
"""
while self.check_space(fdt_finish_reservemap(self._fdt)):
pass
def begin_node(self, name):
"""Begin a new node
Use this before adding properties to the node. Then call end_node() to
finish it. You can also use the context manager as shown in the FdtSw
class comment.
Args:
name: Name of node to begin
Raises:
FdtException on any error
"""
while self.check_space(fdt_begin_node(self._fdt, name)):
pass
def property_string(self, name, string):
"""Add a property with a string value
The string will be nul-terminated when written to the device tree
Args:
name: Name of property to add
string: String value of property
Raises:
FdtException on any error
"""
while self.check_space(fdt_property_string(self._fdt, name, string)):
pass
def property_u32(self, name, val):
"""Add a property with a 32-bit value
Write a single-cell value to the device tree
Args:
name: Name of property to add
val: Value of property
Raises:
FdtException on any error
"""
while self.check_space(fdt_property_u32(self._fdt, name, val)):
pass
def property_u64(self, name, val):
"""Add a property with a 64-bit value
Write a double-cell value to the device tree in big-endian format
Args:
name: Name of property to add
val: Value of property
Raises:
FdtException on any error
"""
while self.check_space(fdt_property_u64(self._fdt, name, val)):
pass
def property_cell(self, name, val):
"""Add a property with a single-cell value
Write a single-cell value to the device tree
Args:
name: Name of property to add
val: Value of property
quiet: Errors to ignore (empty to raise on all errors)
Raises:
FdtException on any error
"""
while self.check_space(fdt_property_cell(self._fdt, name, val)):
pass
def property(self, name, val):
"""Add a property
Write a new property with the given value to the device tree. The value
is taken as is and is not nul-terminated
Args:
name: Name of property to add
val: Value of property
quiet: Errors to ignore (empty to raise on all errors)
Raises:
FdtException on any error
"""
while self.check_space(fdt_property_stub(self._fdt, name, val,
len(val))):
pass
def end_node(self):
"""End a node
Use this after adding properties to a node to close it off. You can also
use the context manager as shown in the FdtSw class comment.
Args:
quiet: Errors to ignore (empty to raise on all errors)
Raises:
FdtException on any error
"""
while self.check_space(fdt_end_node(self._fdt)):
pass
def add_node(self, name):
"""Create a new context for adding a node
When used in a 'with' clause this starts a new node and finishes it
afterward.
Args:
name: Name of node to add
"""
return NodeAdder(self, name)
class NodeAdder():
"""Class to provide a node context
This allows you to add nodes in a more natural way:
with fdtsw.add_node('name'):
fdtsw.property_string('test', 'value')
The node is automatically completed with a call to end_node() when the
context exits.
"""
def __init__(self, fdtsw, name):
self._fdt = fdtsw
self._name = name
def __enter__(self):
self._fdt.begin_node(self._name)
def __exit__(self, type, value, traceback):
self._fdt.end_node()
%}
%rename(fdt_property) fdt_property_func;
/*
* fdt32_t is a big-endian 32-bit value defined to uint32_t in libfdt_env.h
* so use the same type here.
*/
typedef uint32_t fdt32_t;
%include "fdt.h"
%include "typemaps.i"
/* Most functions don't change the device tree, so use a const void * */
%typemap(in) (const void *)(const void *fdt) {
if (!PyByteArray_Check($input)) {
SWIG_exception_fail(SWIG_TypeError, "in method '" "$symname"
"', argument " "$argnum"" of type '" "$type""'");
}
$1 = (void *)PyByteArray_AsString($input);
fdt = $1;
fdt = fdt; /* avoid unused variable warning */
}
/* Some functions do change the device tree, so use void * */
%typemap(in) (void *)(const void *fdt) {
if (!PyByteArray_Check($input)) {
SWIG_exception_fail(SWIG_TypeError, "in method '" "$symname"
"', argument " "$argnum"" of type '" "$type""'");
}
$1 = PyByteArray_AsString($input);
fdt = $1;
fdt = fdt; /* avoid unused variable warning */
}
/* typemap used for fdt_get_property_by_offset() */
%typemap(out) (struct fdt_property *) {
PyObject *buff;
if ($1) {
resultobj = PyString_FromString(
fdt_string(fdt1, fdt32_to_cpu($1->nameoff)));
buff = PyByteArray_FromStringAndSize(
(const char *)($1 + 1), fdt32_to_cpu($1->len));
resultobj = SWIG_Python_AppendOutput(resultobj, buff);
}
}
%apply int *OUTPUT { int *lenp };
/* typemap used for fdt_getprop() */
%typemap(out) (const void *) {
if (!$1)
$result = Py_None;
else
$result = Py_BuildValue("s#", $1, *arg4);
}
/* typemap used for fdt_setprop() */
%typemap(in) (const void *val) {
$1 = PyString_AsString($input); /* char *str */
}
/* typemaps used for fdt_next_node() */
%typemap(in, numinputs=1) int *depth (int depth) {
depth = (int) PyInt_AsLong($input);
$1 = &depth;
}
%typemap(argout) int *depth {
PyObject *val = Py_BuildValue("i", *arg$argnum);
resultobj = SWIG_Python_AppendOutput(resultobj, val);
}
%apply int *depth { int *depth };
/* typemaps for fdt_get_mem_rsv */
%typemap(in, numinputs=0) uint64_t * (uint64_t temp) {
$1 = &temp;
}
%typemap(argout) uint64_t * {
PyObject *val = PyLong_FromUnsignedLongLong(*arg$argnum);
if (!result) {
if (PyTuple_GET_SIZE(resultobj) == 0)
resultobj = val;
else
resultobj = SWIG_Python_AppendOutput(resultobj, val);
}
}
/* We have both struct fdt_property and a function fdt_property() */
%warnfilter(302) fdt_property;
/* These are macros in the header so have to be redefined here */
uint32_t fdt_magic(const void *fdt);
uint32_t fdt_totalsize(const void *fdt);
uint32_t fdt_off_dt_struct(const void *fdt);
uint32_t fdt_off_dt_strings(const void *fdt);
uint32_t fdt_off_mem_rsvmap(const void *fdt);
uint32_t fdt_version(const void *fdt);
uint32_t fdt_last_comp_version(const void *fdt);
uint32_t fdt_boot_cpuid_phys(const void *fdt);
uint32_t fdt_size_dt_strings(const void *fdt);
uint32_t fdt_size_dt_struct(const void *fdt);
int fdt_property_string(void *fdt, const char *name, const char *val);
int fdt_property_cell(void *fdt, const char *name, uint32_t val);
/*
* This function has a stub since the name fdt_property is used for both a
* function and a struct, which confuses SWIG.
*/
int fdt_property_stub(void *fdt, const char *name, const char *val, int len);
%include <libfdt.h>