1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
#!/usr/bin/perl -w
#
# Generates a bootable CD-ROM for S/390
#
# Copyright (C) 2006 Novell Inc.
#
# This program 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 program 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 program; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street,
# Fifth Floor,
# Boston, MA 02110-1301,
# USA.
#
# $Id: gen-s390-cd-kernel.pl 107 2009-03-06 11:48:14Z ro $
use FileHandle;
use Getopt::Long;
use strict;
# Help text
#
sub help($) {
my $exitcode = shift || 1;
print "Usage: $0 <OPTIONS> - generate a kernel image for CD-ROM boot\n";
print "SYNOPSIS: $0 [--initrd=file] \n";
print " [--parmfile=file] [--outfile=file] \n";
print " [--kernel=file] [--cmdline=string] \n";
exit $exitcode;
}
# Parse command line options
my ($initrd, $image, $parmfile, $outfile, $cmdline ) =
('/boot/initrd','/boot/image', '', '/tmp/image.cd', 'root=/dev/sda2');
Getopt::Long::Configure ("bundling");
eval {
unless (GetOptions (
'i|initrd=s' => \$initrd,
'k|kernel=s' => \$image,
'p|parmfile=s' => \$parmfile,
'o|outfile=s' => \$outfile,
'c|cmdline=s' => \$cmdline,
'h|help' => sub { help(0); } )) {
help(1);
}
};
if ($@) {
print "$@";
help(1);
}
# Open input files
sysopen(image_fh,$image,O_RDONLY) or die "Cannot open $image: $!\n";
sysopen(initrd_fh,$initrd,O_RDONLY) or die "Cannot $initrd: $!\n";
my $image_size = (stat(image_fh))[7];
my $initrd_size = (stat(initrd_fh))[7];
# Get the size of the input files
printf("%s: offset 0x%x len 0x%x (%d blocks)\n",
$image, 0, $image_size, ($image_size >> 12) + 1);
# The kernel appearently needs some free space above the
# actual image (bss? stack?), so use this hard-coded
# limit (from include/asm-s390/setup.h)
# my $initrd_offset = (($image_size >> 12) + 1) << 12;
my $initrd_offset = 0x1000000;
my $boot_size = ((($initrd_offset + $initrd_size) >> 12) + 1 ) << 12;
printf("%s: offset 0x%x len 0x%x (%d blocks)\n",
$initrd, $initrd_offset, $initrd_size, ($initrd_size >>12) + 1);
printf("%s: len 0x%x (%d blocks)\n",
$outfile, $initrd_offset + $initrd_size, $boot_size / 4096);
# Get the kernel command line arguments
$cmdline .= " " if ($cmdline ne "");
if ($parmfile ne "") {
my $line;
$cmdline = '';
open(parm_fh,$parmfile) or die "Cannot open $parmfile: $!\n";
while($line=<parm_fh>) {
chomp $line;
$cmdline .= $line . " ";
}
close(parm_fh);
}
if ($cmdline ne "") {
chop $cmdline;
}
# Max length for the kernel command line is 896 bytes
die "Kernel commandline too long (". length($cmdline) ." bytes)\n" if (length($cmdline) >= 896);
# Now create the image file.
sysopen(out_fh,$outfile,O_RDWR|O_CREAT|O_TRUNC) or die "Cannot open $outfile: $!\n";
# First fill the entire size with zeroes
sysopen(null_fh,"/dev/zero",O_RDONLY) or die "Cannot open /dev/zero: $!\n";
my $buffer="";
my $blocks_read=0;
while ($blocks_read < ($boot_size >> 12)) {
sysread(null_fh,$buffer, 4096);
syswrite(out_fh,$buffer);
$blocks_read += 1;
}
print "Read $blocks_read blocks from /dev/zero\n";
close(null_fh);
# Now copy the image file to location 0
sysseek(out_fh,0,0);
$blocks_read = 0;
while (sysread(image_fh,$buffer, 4096) != 0) {
syswrite(out_fh,$buffer,4096);
$blocks_read += 1;
}
print "Read $blocks_read blocks from $image\n";
close(image_fh);
# Then the initrd to location specified by initrd_offset
sysseek(out_fh,$initrd_offset,0);
$blocks_read = 0;
while (sysread(initrd_fh,$buffer, 4096) != 0) {
syswrite(out_fh,$buffer,4096);
$blocks_read += 1;
}
print "Read $blocks_read blocks from $initrd\n";
close(initrd_fh);
# Now for the real black magic.
# If we are loading from CD-ROM or HMC, the kernel is already loaded
# in memory by the first loader itself.
print "Setting boot loader control to 0x10000\n";
sysseek(out_fh,4,0 );
syswrite(out_fh,pack("N",0x80010000),4);
print "Writing kernel commandline (". length($cmdline) ." bytes):\n$cmdline\n";
sysseek(out_fh,0x10480,0);
syswrite(out_fh,$cmdline,length($cmdline));
print "Setting initrd parameter: offset $initrd_offset size $initrd_size\n";
sysseek(out_fh,0x1040C,0);
syswrite(out_fh,pack("N",$initrd_offset),4);
sysseek(out_fh,0x10414,0);
syswrite(out_fh,pack("N",$initrd_size),4);
close(out_fh);
|