BaseTools: Rename AmlToHex script to AmlToC

The AmlToHex script and Posix/WindowsLike wrappers convert
an AML file to a .hex file, containing a C array storing
AML bytecode. This ".hex" file can then be included in a
C file, allowing to access the AML bytecode from this C
file.

The EDK2 build system doesn't allow to a depict dependency
orders between files of different languages. For instance,
in a module containing a ".c" file and a ".asl", the ".c"
file may or may not be built prior to the ".asl" file.
This prevents any inclusion of a generated ".hex" in a
".c" file since this later ".hex" file may or may not
have been created yet.

This patch renames the script as AmlToC. It is posted as
a separate patch to prevent git from seeing the renaming
as a deletion plus addition of a new file.
The ending line of the posix-like bin-wrapper script has
also been corrected.

This is a first step toward generating a C file containing
the AML bytecode from an ASL file. This C file will then
be handled by the EDK2 build system to generate an object
file.
Thus, no file inclusion will be required anymore. The C file
requiring the AML bytecode as a C array, and the ASL file,
will be compiled independently. The C array must be defined
as an external symbol. The linker is resolving the
reference to the C array symbol.

To summarize, the flow goes as:
 -1. ASL file is compiled to AML;
 -2. AML file is copied to a ".amli" intermediate file;
 -3. EDK2 build system applies the rule relevant to ".amli"
     files. This is, calling the "AmlToC" script, generating
     a C file from the ".amli" file;
 -4. EDK2 build system applies the rule relevant to C files.
     This is creating an object file.
 -5. EDK2 build system links the object file containing the
     AML bytecode with the object file requiring it.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Suggested-by: Tomas Pilar <Tomas.Pilar@arm.com>

Reviewed-by: Bob Feng <bob.c.feng@intel.com>

1 files changed, 156 insertions, 0 deletions

diff --git a/BaseTools/Source/Python/AmlToC/AmlToC.py b/BaseTools/Source/Python/AmlToC/AmlToC.py
new file mode 100644
index 0000000000..643db2910e
--- /dev/null
+++ b/BaseTools/Source/Python/AmlToC/AmlToC.py
@@ -0,0 +1,156 @@
+## @file

+#

+# Convert an AML file to a .hex file containing the AML bytecode stored in a

+# C array.

+# By default, "Tables\Dsdt.aml" will generate "Tables\Dsdt.hex".

+# "Tables\Dsdt.hex" 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

+

+## Parse the command line arguments.

+#

+# @retval A argparse.NameSpace instance, containing parsed values.

+#

+def ParseArgs():

+    # Initialize the parser.

+    Parser = argparse.ArgumentParser(

+      description="Convert an AML file to a .hex file containing the AML " + \

+                  "bytecode stored in a C array. By default, " + \

+                  "\"Tables\\Dsdt.aml\" will generate" + \

+                  "\"Tables\\Dsdt.hex\". \"Tables\\Dsdt.hex\" will " + \

+                  "contain a C array named \"dsdt_aml_code\" that " + \

+                  "contains the AML bytecode."

+      )

+

+    # Define the possible arguments.

+    Parser.add_argument(

+      dest="InputFile",

+      help="Path to an input AML file to generate a .hex file from."

+      )

+    Parser.add_argument(

+      "-o", "--out-dir", dest="OutDir",

+      help="Output directory where the .hex 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: %s" % 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 + ".hex"

+          )

+    else:

+        if not os.path.exists(Args.OutDir):

+            os.mkdir(Args.OutDir)

+        Args.OutputFile = os.path.join(Args.OutDir, BaseName + ".hex")

+

+    Args.BaseName = BaseName

+

+    return Args

+

+## Convert an AML file to a .hex file containing the AML bytecode stored

+#  in a C array.

+#

+# @param  InputFile     Path to the input AML file.

+# @param  OutputFile    Path to the output .hex file to generate.

+# @param  BaseName      Base name of the input file.

+#                       This is also the name of the generated .hex file.

+#

+def AmlToHex(InputFile, OutputFile, BaseName):

+

+    MacroName = "__{}_HEX__".format(BaseName.upper())

+    ArrayName = BaseName.lower() + "_aml_code"

+

+    with open(InputFile, "rb") as fIn, open(OutputFile, "w") as fOut:

+        # Write header.

+        fOut.write("// This file has been generated from:\n" + \

+                   "// \tPython script: " + \

+                   os.path.abspath(__file__) + "\n" + \

+                   "// \tInput AML file: " + \

+                   os.path.abspath(InputFile) + "\n\n" + \

+                   "#ifndef {}\n".format(MacroName) + \

+                   "#define {}\n\n".format(MacroName)

+                   )

+

+        # 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")

+

+        # Write footer.

+        fOut.write("#endif // {}\n".format(MacroName))

+

+## Main method

+#

+# This method:

+#   1-  Initialize an EdkLogger instance.

+#   2-  Parses the input arguments.

+#   3-  Converts an AML file to a .hex 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 .hex file containing the AML bytecode stored

+        # in a C array.

+        AmlToHex(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)