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""" xcxcxc

"""

import sys

import getopt

import math

def usage():

    print "usage:"

    print "python bin2hdl.py [arguments]\n"

    print "Inserts data in VHDL template\n"

    print "ALL of the following arguments should be given, in any order:"

    print "{c|code} <filename>        Code binary image file name"

    print "{v|vhdl} <filename>        VHDL template"

    print "{a|architecture} <name>    Name of target VHDL architecture"

    print "{e|entity} <name>          Name of target VHDL entity"

    print "{o|output} <filename>      Target VHDL file name"

    print "code_size <number>         Size of code memory in words (decimal)"

    print "data_size <number>         Size of data memory in words (decimal)"

    print ""

    print "Additionally, any of these arguments can be given:"

    print "{s|sim_len} <number>       Length of simulation in clock cycles"

    print "{d|data} <filename>        Data binary image file name or 'empty'"

    print "{h|help}                   Display some help text and exit"

    print "{i|indent} <number>        Indentation in VHDL tables (decimal)"

def help():

    print "\nPurpose:\n"

    print "Reads the code and data binary files and 'slices' them in byte"

    print "columns."

    print "The data columns are converted to VHDL strings and then inserted"

    print "into the vhdl template, in place of tags @code0@ .. @code3@ and "

    print "@data0@ .. @data3@. Column 0 is LSB and column3 is MSB.\n"

    print "Tags like @data31@ and @data20@ etc. can be used to initialize"

    print "memories in 16-bit buses, also split in byte columns.\n"

    print "Other template tags are replaced as follows:"

    print "@entity_name@         : Name of entity in target vhdl file"

    print "@arch_name@           : Name of architecture in target vhdl file"

    print "@sim_len@             : Length of simulation in clock cycles"

    print "@code_table_size@     : Size of code RAM block, in words"

    print "@code_addr_size@      : ceil(Log2(@code_table_size@))"

    print "@data_table_size@     : Size of data RAM block, in words"

    print "@data_addr_size@      : ceil(Log2(@data_table_size@))"

def build_vhdl_tables(code,table_size, indent_size):

    # Build the four byte column tables. [0] is LSB, [3] is MSB

    tables = [[0 for i in range(table_size)] for i in range(4)]

    # Separate binary data into byte columns

    # (here's where data endianess matters, we're assuming big endian)

    byte = 0    # byte 0 is LSB, 3 is MSB

    index = 0   # index into column table    

    for c in code:

        #print str(ord(c)) + " " +  str(byte) + " " + str(index)

        tables[3-byte][index] = ord(c)

        #for k in tables:

        #    print k[0:4]

        byte = byte + 1

        if byte == 4:

            byte = 0

            index = index + 1

    # Write the data for each of the four column tables as a VHDL byte

    # constant table.

    vhdl_data_strings = [" "*indent_size]*6

    for j in range(4):

        col = 0

        word = len(tables[j])

        for c in tables[j]:

            word = word - 1

            if word > 0:

                item = "X\"%02X\"," % c

            else:

                item = "X\"%02X\"" % c

            col = col + 1

            if col == 8:

                col = 0

                item = item + "\n" + " "*indent_size

            vhdl_data_strings[j] = vhdl_data_strings[j] + item

        vhdl_data_strings[j] = "\n" + vhdl_data_strings[j]

    # ok, now build init strings for 16-bit wide memorier, split in 2 byte 

    # columns: an odd column with bytes 3:1 and an even column with bytes 2:0

    byte_order = [3,1,2,0]

    for j in range(2):

        col = 0

        word_count = len(tables[j*2])

        for i in range(word_count):

            w_high = tables[byte_order[j*2+0]][i]

            w_low  = tables[byte_order[j*2+1]][i]

            word_count = word_count - 1

            if word_count > 0:

                item_h = "X\"%02X\"," % w_high

                item_l = "X\"%02X\"," % w_low

            else:

                item_h = "X\"%02X\"," % w_high

                item_l = "X\"%02X\"" % w_low

            item = item_h + item_l

            col = col + 1

            if col == 4:

                col = 0

                item = item + "\n" + " "*indent_size

            vhdl_data_strings[4+j] = vhdl_data_strings[4+j] + item

        vhdl_data_strings[4+j] = "\n" + vhdl_data_strings[4+j]

    return vhdl_data_strings

def main(argv):

    code_filename = ""          # file with code sections (text+reginfo+rodata)

    data_filename = ""          # file with data sections (data+bss)

    vhdl_filename = ""          # name of vhdl template file

    entity_name = "mips_tb"     # name of vhdl entity to be generated

    arch_name = "testbench"     # name of vhdl architecture to be generated

    target_filename = "tb.vhdl" # name of target vhdl file

    indent = 4                  # indentation for table data, in spaces

    code_table_size = -1        # size of VHDL table

    data_table_size = -1        # size of VHDL table

    bin_words = 0               # size of binary file in 32-bit words 

    simulation_length = 22000   # length of logic simulation in clock cycles

    #

    try:

        opts, args = getopt.getopt(argv, "hc:d:v:a:e:o:i:s:",

        ["help", "code=", "data=", "vhdl=", "architecture=",

         "entity=", "output=", "indent=", "sim_len=",

         "code_size=", "data_size="])

    except getopt.GetoptError:

        usage()

        sys.exit(2)

    # Parse coommand line parameters

    for opt, arg in opts:

        if opt in ("-h", "--help"):

            usage()

            help()

            exit(1)

        if opt in ("-v", "--vhdl"):

            vhdl_filename = arg

        elif opt in ("-o", "--output"):

            target_filename = arg

        elif opt in ("-c", "--code"):

            code_filename = arg

        elif opt in ("-d", "--data"):

            data_filename = arg

        elif opt in ("-a", "--architecture"):

            arch_name = arg

        elif opt in ("-e", "--entity"):

            entity_name = arg

        elif opt in ("-i", "--indent"):

            indent = int(arg)

        elif opt in ("-s", "--sim_len"):

            simulation_length = int(arg)

        elif opt == "--code_size":

            code_table_size = int(arg)

        elif opt == "--data_size":

            data_table_size = int(arg)

    # See if all mandatory options are there

    if code_filename=="" or vhdl_filename=="" or \

       code_table_size < 0 or data_table_size<0:

        print "Some mandatory parameter is missing\n"

        usage()

        sys.exit(2)

    # Open binary code and data input files and read them into buffers

    try:

        fin = open(code_filename, "rb")

        code = fin.read()

        fin.close()

    except IOError:

        print "Binary File %s not found" % code_filename

    if data_filename != "":

        if data_filename == "empty":

            data = []

        else:

            try:

                fin = open(data_filename, "rb")

                data = fin.read()

                fin.close()

            except IOError:

                print "Binary File %s not found" % data_filename

    #print "Read " + str(len(code)) + " bytes."

    # Make sure the code and data will fit in the tables

    bin_words = len(code) / 4

    if bin_words > code_table_size:

        print "Code does not fit table: " + str(bin_words) + " words,",

        print str(code_table_size) + " table entries"

        sys.exit(1)

    if data_filename != "":

        # FIXME We're not checking for BSS size here, only .data (?)

        bin_words = len(data) / 4

        if bin_words > data_table_size:

            print "Data does not fit table: " + str(bin_words) + " words,",

            print str(data_table_size) + " table entries"

            sys.exit(1)

    # Build the VHDL strings for each slice of both code and data tables

    vhdl_code_strings = build_vhdl_tables(code, code_table_size, indent)

    if data_filename != "":

        vhdl_data_strings = build_vhdl_tables(data, data_table_size, indent)

    else:

        # In case we didn't get a data binary, we want the vhdl compilation 

        # to fail when @data@ tags are used, just to catch the error

        vhdl_data_strings = ["error: missing data binary file"]*6

    # Now start scanning the VHDL template, inserting data where needed

    # Read template file...

    fin = open(vhdl_filename, "r")

    vhdl_lines = fin.readlines()

    fin.close()

    # ...and build the keyword and replacement tables

    keywords = ["@code0@","@code1@","@code2@","@code3@",

                "@code31@", "@code20@",

                "@data0@","@data1@","@data2@","@data3@",

                "@data31@", "@data20@",

                "@entity_name@","@arch_name@",

                "@sim_len@",

                "@xram_size@",

                "@code_table_size@","@code_addr_size@",

                "@data_table_size@","@data_addr_size@"];

    replacement = vhdl_code_strings + vhdl_data_strings + \

                 [entity_name, arch_name,

                  str(simulation_length),

                  str(data_table_size),

                  str(code_table_size),

                  str(int(math.floor(math.log(code_table_size,2)))),

                  str(data_table_size),

                  str(int(math.floor(math.log(data_table_size,2))))]

    # Now traverse the template lines replacing any keywords with the proper 

    # vhdl stuff we just built above.

    output = ""

    for vhdl_line in vhdl_lines:

        temp = vhdl_line

        for i in range(len(keywords)):

            if temp.rfind(keywords[i]) >= 0:

                temp = temp.replace(keywords[i], replacement[i])

                # uncomment this break to check for ONE keyword per line only

                #break

        output = output + temp

    try:

        fout = open(target_filename, "w")

        fout.write(output)

        fout.close()

        print "Wrote VHDL file '%s'" % target_filename

    except IOError:

        print "Could not write to file %s" % target_filename

    sys.exit(0)

if __name__ == "__main__":

    main(sys.argv[1:])

    sys.exit(0)