blob: da298394daa244cdd67f6837d5d1826d61360038 (
plain)
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
|
#!/bin/bash
#
# Create an initrd directory if one does not already exist.
#
# 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, you can access it online at
# http://www.gnu.org/licenses/gpl-2.0.html.
#
# Copyright (C) IBM Corporation, 2013
#
# Author: Connor Shu <Connor.Shu@ibm.com>
D=tools/testing/selftests/rcutorture
# Prerequisite checks
[ -z "$D" ] && echo >&2 "No argument supplied" && exit 1
if [ ! -d "$D" ]; then
echo >&2 "$D does not exist: Malformed kernel source tree?"
exit 1
fi
if [ -s "$D/initrd/init" ]; then
echo "$D/initrd/init already exists, no need to create it"
exit 0
fi
T=${TMPDIR-/tmp}/mkinitrd.sh.$$
trap 'rm -rf $T' 0 2
mkdir $T
cat > $T/init << '__EOF___'
#!/bin/sh
# Run in userspace a few milliseconds every second. This helps to
# exercise the NO_HZ_FULL portions of RCU.
while :
do
q=
for i in \
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a \
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a \
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a \
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a \
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a \
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
do
q="$q $i"
done
sleep 1
done
__EOF___
# Try using dracut to create initrd
if command -v dracut >/dev/null 2>&1
then
echo Creating $D/initrd using dracut.
# Filesystem creation
dracut --force --no-hostonly --no-hostonly-cmdline --module "base" $T/initramfs.img
cd $D
mkdir -p initrd
cd initrd
zcat $T/initramfs.img | cpio -id
cp $T/init init
chmod +x init
echo Done creating $D/initrd using dracut
exit 0
fi
# No dracut, so create a C-language initrd/init program and statically
# link it. This results in a very small initrd, but might be a bit less
# future-proof than dracut.
echo "Could not find dracut, attempting C initrd"
cd $D
mkdir -p initrd
cd initrd
cat > init.c << '___EOF___'
#ifndef NOLIBC
#include <unistd.h>
#include <sys/time.h>
#endif
volatile unsigned long delaycount;
int main(int argc, int argv[])
{
int i;
struct timeval tv;
struct timeval tvb;
for (;;) {
sleep(1);
/* Need some userspace time. */
if (gettimeofday(&tvb, NULL))
continue;
do {
for (i = 0; i < 1000 * 100; i++)
delaycount = i * i;
if (gettimeofday(&tv, NULL))
break;
tv.tv_sec -= tvb.tv_sec;
if (tv.tv_sec > 1)
break;
tv.tv_usec += tv.tv_sec * 1000 * 1000;
tv.tv_usec -= tvb.tv_usec;
} while (tv.tv_usec < 1000);
}
return 0;
}
___EOF___
# build using nolibc on supported archs (smaller executable) and fall
# back to regular glibc on other ones.
if echo -e "#if __x86_64__||__i386__||__i486__||__i586__||__i686__" \
"||__ARM_EABI__||__aarch64__\nyes\n#endif" \
| ${CROSS_COMPILE}gcc -E -nostdlib -xc - \
| grep -q '^yes'; then
# architecture supported by nolibc
${CROSS_COMPILE}gcc -fno-asynchronous-unwind-tables -fno-ident \
-nostdlib -include ../bin/nolibc.h -lgcc -s -static -Os \
-o init init.c
else
${CROSS_COMPILE}gcc -s -static -Os -o init init.c
fi
rm init.c
echo "Done creating a statically linked C-language initrd"
exit 0
|
