kbuild.sh


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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0+

set -e

kbuild_root=$(dirname $(readlink -f "$0"))

declare -A cross_compile

if [[ -r $kbuild_root/config.sh ]] ; then
	source $kbuild_root/config.sh || exit 1
fi

#kbuild_options='CONFIG_DEBUG_SECTION_MISMATCH=y'
#kbuild_options='C=1'
kbuild_options="KALLSYMS_EXTRA_PASS=0"

nfs_root=$HOME/src/netboot
tftp_root=$HOME/tftpboot

#
# Options parsing
#

do_compile_doc=0
do_menu_config=0
do_package_deb=0
opt_bootloader=
opt_cmdline_file=
opt_defconfig=

while [[ $# != 0 ]] ; do
	option=$1
	shift

	case $option in
		--bootloader)
			opt_bootloader=$1
			if [[ ! -r $opt_bootloader ]] ; then
				echo "Boot loader file $opt_bootloader is not readable"
				exit 1
			fi
			shift
			;;
		--cmdline)
			opt_cmdline_file=$1
			if [[ ! -r $opt_cmdline_file ]] ; then
				echo "Command line file $opt_cmdline_file is not readable"
				exit 1
			fi
			shift
			;;
		--config)
			do_menu_config=1
			;;
		--deb)
			do_package_deb=1
			;;
		--defconfig)
			opt_defconfig=$1
			if [[ ! -r $opt_defconfig ]] ; then
				echo "defconfig file $opt_defconfig is not readable"
				exit 1
			fi
			shift
			;;
		--doc)
			do_compile_doc=1
			;;
		--*)
			echo "Unrecognized option $option"
			exit 1
			;;
		*)
			platform=$option
			;;
	esac
done

#
# Platform
#

kcflags="-Werror -Wno-error=cpp"

if [[ -z "$platform" ]] ; then
	for f in $kbuild_root/platforms/*.sh ; do
		pattern=$(cat $f | grep "dir_pattern=" | head -1)
		pattern=${pattern/#dir_pattern=/}
		if [[ -n "$pattern" ]] ; then
			echo $PWD | grep -q "$pattern" || continue
			platform=$(basename -s .sh $f)
			break
		fi
	done
fi

if [[ ! -r "$kbuild_root/platforms/$platform.sh" ]] ; then
	echo "Unknown platform '$platform'. Supported platforms are"
	for f in $kbuild_root/platforms/*.sh ; do
		echo "- $(basename -s .sh $f)"
	done
	exit 1
fi

source "${kbuild_root}/platforms/$platform.sh" || exit 1

#
# Architecture
#

if [[ ! -r "$kbuild_root/arch/$arch.sh" ]] ; then
	echo "Unknown architecture '$arch'. Supported architectures are"
	for f in $kbuild_root/arch/*.sh ; do
		echo "- $(basename -s .sh $f)"
	done
	exit 1
fi

source "${kbuild_root}/arch/$arch.sh" || exit 1

target_dir=${target_dir:-${target_root[$arch]}}
output_dir=$PWD/output/$arch_dir

#
# Build environment and tools
#

num_cpus=$(cat /proc/cpuinfo | grep '^processor\b' | wc -l)
make="make ARCH=$arch O=$output_dir CROSS_COMPILE=${cross_compile[$arch]}"
pmake="$make -j$((num_cpus*2))"

echo "Compiling for platform $platform with $num_cpus CPUs"

mkdir -p $output_dir/

if [[ -n "$opt_defconfig" ]] ; then
	mkdir -p $output_dir/arch/$arch/configs/
	cp $opt_defconfig $output_dir/arch/$arch/configs/build_defconfig
	$make build_defconfig
	rm $output_dir/arch/$arch/configs/build_defconfig
fi

if [[ $do_menu_config = 1 ]] ; then
	$make menuconfig
	exit 0
fi

#
# Compile documentation if requested
#

if [[ $do_compile_doc = 1 ]] ; then
	$pmake DOCBOOKS='' htmldocs
fi

#
# Compile the kernel, modules and DTBs
#

kernel_dtbs=
for dtb in $dtbs ; do
	dtb=${dtb/:*/}
	kernel_dtbs="$kernel_dtbs $dtb"
done

$pmake $kbuild_options KCFLAGS="$kcflags" $image_kernel $kernel_dtbs

grep 'CONFIG_MODULES=y' $output_dir/.config > /dev/null && modules=modules
if [[ x$modules == xmodules ]] ; then
	$pmake $kbuild_options KCFLAGS="$kcflags" $modules
fi

version=$(cat $output_dir/include/generated/utsrelease.h | cut -d '"' -f 2)

#
# Create the image
#

if [[ -r "$kbuild_root/images/$image.sh" ]] ; then
	source "${kbuild_root}/images/$image.sh" || exit 1
	eval make_${image}_image
else
	image_file=$output_dir/arch/$arch/boot/$image
fi

#
# Copy the files to their destination directories
#

copy_dtbs() {
	local dtb
	local target_dir=$1

	for dtb in $dtbs ; do
		local src=${dtb/:*/}
		local dst=${dtb/*:/}
		dst=${dst/*\//}

		cp $output_dir/arch/${ARCH}/boot/dts/$src* $target_dir/$dst
	done
}

mkdir -p $boot_dir
cp $image_file $boot_dir/

if [[ $image != FIT && $image != CrOS ]] ; then
	copy_dtbs $boot_dir/
fi

if [[ x$modules = xmodules ]] ; then
	$pmake INSTALL_MOD_PATH=$target_dir modules_install
fi

#
# Create the Debian package if requested
#

if [[ $do_package_deb = 1 ]] ; then
	$pmake bindeb-pkg
fi

#
# Print status and terminate
#

echo "Kernel image available in $image_file"
if [[ x$modules = xmodules ]] ; then
	echo "Kernel modules installed to $target_dir/lib/modules/$version"
fi
echo "Build $version completed at $(date)"