BaseTools/Source/Python/AmlToC/AmlToC.py

## @file
#
# Convert an AML file to a .c file containing the AML bytecode stored in a
# C array.
# By default, "Tables\Dsdt.aml" will generate "Tables\Dsdt.c".
# "Tables\Dsdt.c" will contain a C array named "dsdt_aml_code" that contains
# the AML bytecode.
#
# Copyright (c) 2020, ARM Limited. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#

import argparse
import Common.EdkLogger as EdkLogger
from Common.BuildToolError import *
import sys
import os

__description__ = r"""
Convert an AML file to a .c file containing the AML bytecode stored in a C
array. By default, Tables\Dsdt.aml will generate Tables\Dsdt.c.
Tables\Dsdt.c will contain a C array named "dsdt_aml_code" that contains
the AML bytecode.
"""

## Parse the command line arguments.
#
# @retval A argparse.NameSpace instance, containing parsed values.
#
def ParseArgs():
    # Initialize the parser.
    Parser = argparse.ArgumentParser(description=__description__)

    # Define the possible arguments.
    Parser.add_argument(dest="InputFile",
                        help="Path to an input AML file to generate a .c file from.")
    Parser.add_argument("-o", "--out-dir", dest="OutDir",
                        help="Output directory where the .c file will be generated. Default is the input file's directory.")

    # Parse the input arguments.
    Args = Parser.parse_args()
    SplitInputName = ""

    if not os.path.exists(Args.InputFile):
        EdkLogger.error(__file__, FILE_OPEN_FAILURE,
                        ExtraData=Args.InputFile)
        return None
    else:
        with open(Args.InputFile, "rb") as fIn:
            Signature = str(fIn.read(4))
            if ("DSDT" not in Signature) and ("SSDT" not in Signature):
                EdkLogger.info("Invalid file type. File does not have a valid DSDT or SSDT signature: {}".format(Args.InputFile))
                return None

    # Get the basename of the input file.
    SplitInputName = os.path.splitext(Args.InputFile)
    BaseName = os.path.basename(SplitInputName[0])

    # If no output directory is specified, output to the input directory.
    if not Args.OutDir:
        Args.OutputFile = os.path.join(os.path.dirname(Args.InputFile),
                                       BaseName + ".c")
    else:
        if not os.path.exists(Args.OutDir):
            os.mkdir(Args.OutDir)
        Args.OutputFile = os.path.join(Args.OutDir, BaseName + ".c")

    Args.BaseName = BaseName

    return Args

## Convert an AML file to a .c file containing the AML bytecode stored
#  in a C array.
#
# @param  InputFile     Path to the input AML file.
# @param  OutputFile    Path to the output .c file to generate.
# @param  BaseName      Base name of the input file.
#                       This is also the name of the generated .c file.
#
def AmlToC(InputFile, OutputFile, BaseName):

    ArrayName = BaseName.lower() + "_aml_code"
    FileHeader =\
"""
// This file has been generated from:
//   -Python script: {}
//   -Input AML file: {}

"""

    with open(InputFile, "rb") as fIn, open(OutputFile, "w") as fOut:
        # Write header.
        fOut.write(FileHeader.format(os.path.abspath(InputFile), os.path.abspath(__file__)))

        # Write the array and its content.
        fOut.write("unsigned char {}[] = {{\n  ".format(ArrayName))
        cnt = 0
        byte = fIn.read(1)
        while len(byte) != 0:
            fOut.write("0x{0:02X}, ".format(ord(byte)))
            cnt += 1
            if (cnt % 8) == 0:
                fOut.write("\n  ")
            byte = fIn.read(1)
        fOut.write("\n};\n")

## Main method
#
# This method:
#   1-  Initialize an EdkLogger instance.
#   2-  Parses the input arguments.
#   3-  Converts an AML file to a .c file containing the AML bytecode stored
#       in a C array.
#
# @retval 0     Success.
# @retval 1     Error.
#
def Main():
    # Initialize an EdkLogger instance.
    EdkLogger.Initialize()

    try:
        # Parse the input arguments.
        CommandArguments = ParseArgs()
        if not CommandArguments:
            return 1

        # Convert an AML file to a .c file containing the AML bytecode stored
        # in a C array.
        AmlToC(CommandArguments.InputFile, CommandArguments.OutputFile, CommandArguments.BaseName)
    except Exception as e:
        print(e)
        return 1

    return 0

if __name__ == '__main__':
    r = Main()
    # 0-127 is a safe return range, and 1 is a standard default error
    if r < 0 or r > 127: r = 1
    sys.exit(r)