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#!/usr/bin/env perl

# ----------------------------------------------------------------------

# mkknlimg by Phil Elwell for Raspberry Pi

# based on extract-ikconfig Dick Streefland

#

# (c) 2009,2010 Dick Streefland <dick@streefland.net>

# (c) 2014,2015 Raspberry Pi (Trading) Limited <info@raspberrypi.org>

#

# Licensed under the terms of the GNU General Public License.

# ----------------------------------------------------------------------

use strict;

use warnings;

use integer;

my $trailer_magic = 'RPTL';

my $tmpfile1 = "/tmp/mkknlimg_$$.1";

my $tmpfile2 = "/tmp/mkknlimg_$$.2";

my $dtok = 0;

while (@ARGV && ($ARGV[0] =~ /^-/))

{

    my $arg = shift(@ARGV);

    if ($arg eq '--dtok')

    {

$dtok = 1;

    }

    else

    {

print ("* Unknown option '$arg'\n");

usage();

    }

}

usage() if (@ARGV != 2);

my $kernel_file = $ARGV[0];

my $out_file = $ARGV[1];

if (! -r $kernel_file)

{

    print ("* File '$kernel_file' not found\n");

    usage();

}

my @wanted_config_lines =

(

'CONFIG_BCM2708_DT'

);

my @wanted_strings =

(

'bcm2708_fb',

'brcm,bcm2708-pinctrl',

'brcm,bcm2835-gpio',

'of_find_property'

);

my $res = try_extract($kernel_file, $tmpfile1);

$res = try_decompress('\037\213\010', 'xy',    'gunzip', 0,

     $kernel_file, $tmpfile1, $tmpfile2) if (!$res);

$res = try_decompress('\3757zXZ\000', 'abcde', 'unxz --single-stream', -1,

     $kernel_file, $tmpfile1, $tmpfile2) if (!$res);

$res = try_decompress('BZh',          'xy',    'bunzip2', 0,

     $kernel_file, $tmpfile1, $tmpfile2) if (!$res);

$res = try_decompress('\135\0\0\0',   'xxx',   'unlzma', 0,

     $kernel_file, $tmpfile1, $tmpfile2) if (!$res);

$res = try_decompress('\211\114\132', 'xy',    'lzop -d', 0,

     $kernel_file, $tmpfile1, $tmpfile2) if (!$res);

$res = try_decompress('\002\041\114\030', 'xy',    'lz4 -d', 1,

     $kernel_file, $tmpfile1, $tmpfile2) if (!$res);

my $append_trailer;

my $trailer;

my $kver = '?';

$append_trailer = $dtok;

if ($res)

{

    $kver = $res->{''} || '?';

    print("Version: $kver\n");

    $append_trailer = $dtok;

    if (!$dtok)

    {

if (config_bool($res, 'bcm2708_fb'))

{

   $dtok ||= config_bool($res, 'CONFIG_BCM2708_DT');

   $dtok ||= config_bool($res, 'brcm,bcm2708-pinctrl');

   $dtok ||= config_bool($res, 'brcm,bcm2835-gpio');

   $append_trailer = 1;

}

else

{

   print ("* This doesn't look like a Raspberry Pi kernel. In pass-through mode.\n");

}

    }

}

elsif (!$dtok)

{

    print ("* Is this a valid kernel? In pass-through mode.\n");

}

if ($append_trailer)

{

    printf("DT: %s\n", $dtok ? "y" : "n");

    my @atoms;

    push @atoms, [ $trailer_magic, pack('V', 0) ];

    push @atoms, [ 'KVer', $kver ];

    push @atoms, [ 'DTOK', pack('V', $dtok) ];

    $trailer = pack_trailer(\@atoms);

    $atoms[0]->[1] = pack('V', length($trailer));

    $trailer = pack_trailer(\@atoms);

}

my $ofh;

my $total_len = 0;

if ($out_file eq $kernel_file)

{

    die "* Failed to open '$out_file' for append\n"

if (!open($ofh, '>>', $out_file));

    $total_len = tell($ofh);

}

else

{

    die "* Failed to open '$kernel_file'\n"

if (!open(my $ifh, '<', $kernel_file));

    die "* Failed to create '$out_file'\n"

if (!open($ofh, '>', $out_file));

    my $copybuf;

    while (1)

    {

my $bytes = sysread($ifh, $copybuf, 64*1024);

last if (!$bytes);

syswrite($ofh, $copybuf, $bytes);

$total_len += $bytes;

    }

    close($ifh);

}

if ($trailer)

{

    # Pad to word-alignment

    syswrite($ofh, "\x000\x000\x000", (-$total_len & 0x3));

    syswrite($ofh, $trailer);

}

close($ofh);

exit($trailer ? 0 : 1);

END {

unlink($tmpfile1) if ($tmpfile1);

unlink($tmpfile2) if ($tmpfile2);

}

sub usage

{

print ("Usage: mkknlimg [--dtok] <vmlinux|zImage|bzImage> <outfile>\n");

exit(1);

}

sub try_extract

{

my ($knl, $tmp) = @_;

my $ver = `strings "$knl" | grep -a -E "^Linux version [1-9]"`;

return undef if (!$ver);

chomp($ver);

my $res = { ''=>$ver };

my $string_pattern = '^('.join('|', @wanted_strings).')$';

my @matches = `strings \"$knl\" | grep -E \"$string_pattern\"`;

foreach my $match (@matches)

{

   chomp($match);

   $res->{$match} = 1;

}

my $config_pattern = '^('.join('|', @wanted_config_lines).')=(.*)$';

my $cf1 = 'IKCFG_ST\037\213\010';

my $cf2 = '0123456789';

my $pos = `tr "$cf1\n$cf2" "\n$cf2=" < "$knl" | grep -abo "^$cf2"`;

if ($pos)

{

$pos =~ s/:.*[\r\n]*$//s;

$pos += 8;

my $err = (system("tail -c+$pos \"$knl\" | zcat > $tmp 2> /dev/null") >> 8);

if (($err == 0) || ($err == 2))

{

if (open(my $fh, '<', $tmp))

{

while (my $line = <$fh>)

{

chomp($line);

$res->{$1} = $2 if ($line =~ /$config_pattern/);

}

close($fh);

}

}

}

return $res;

}

sub try_decompress

{

my ($magic, $subst, $zcat, $idx, $knl, $tmp1, $tmp2) = @_;

my $pos = `tr "$magic\n$subst" "\n$subst=" < "$knl" | grep -abo "^$subst"`;

if ($pos)

{

chomp($pos);

$pos = (split(/[\r\n]+/, $pos))[$idx];

return undef if (!defined($pos));

$pos =~ s/:.*[\r\n]*$//s;

my $cmd = "tail -c+$pos \"$knl\" | $zcat > $tmp2 2> /dev/null";

my $err = (system($cmd) >> 8);

return undef if (($err != 0) && ($err != 2));

return try_extract($tmp2, $tmp1);

}

return undef;

}

sub pack_trailer

{

my ($atoms) = @_;

my $trailer = pack('VV', 0, 0);

for (my $i = $#$atoms; $i>=0; $i--)

{

my $atom = $atoms->[$i];

$trailer .= pack('a*x!4Va4', $atom->[1], length($atom->[1]), $atom->[0]);

}

return $trailer;

}

sub config_bool

{

my ($configs, $wanted) = @_;

my $val = $configs->{$wanted} || 'n';

return (($val eq 'y') || ($val eq '1'));

}