mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-13 20:12:26 +00:00
300 lines
13 KiB
Python
Executable File
300 lines
13 KiB
Python
Executable File
#!/usr/bin/env python3
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import os
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import pathlib
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import shutil
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import subprocess
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import sys
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import time
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import re
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import common
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class BuildrootComponent(common.Component):
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def add_parser_arguments(self, parser):
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parser.add_argument(
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'-B', '--buildroot-config', default=self._defaults['buildroot_config'], action='append',
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help='''Add a single Buildroot config to the current build.
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Example value: 'BR2_TARGET_ROOTFS_EXT2_SIZE="512M"'.
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Can be used multiple times to add multiple configs.
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Takes precedence over any Buildroot config files.
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'''
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)
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parser.add_argument(
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'-b', '--buildroot-config-fragment', default=self._defaults['buildroot_config_fragment'], action='append',
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help='''Also use the given Buildroot configuration fragment file.
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Pass multiple times to use multiple fragment files.
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'''
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)
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parser.add_argument(
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'--build-linux', default=self._defaults['build_linux'], action='store_true',
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help='''\
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Enable building the Linux kernel with Buildroot. This is done mostly
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to extract Buildroot's default kernel configurations when updating Buildroot.
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That kernel will not be use by our scripts.
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'''
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)
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parser.add_argument(
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'--baseline', default=self._defaults['baseline'], action='store_true',
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help='''Do a default-ish Buildroot defconfig build, without any of our extra options.
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Mostly to track how much slower we are than a basic build.
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'''
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)
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parser.add_argument(
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'-C', '--kernel-config', default=self._defaults['kernel_config'], action='append',
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help='''\
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Add a single kernel config configs to the current build.
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Example value: 'CONFIG_FORTIFY_SOURCE=y'.
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Can be used multiple times to add multiple configs.
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Takes precedence over any Buildroot config files.
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'''
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)
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parser.add_argument(
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'-c', '--kernel-config-fragment', default=self._defaults['kernel_config_fragment'], action='append',
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help='''\
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Also use the given kernel configuration fragment file.
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Pass multiple times to use multiple fragment files.
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'''
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)
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parser.add_argument(
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'-I', '--initramfs', default=self._defaults['initramfs'], action='store_true',
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)
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parser.add_argument(
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'-i', '--initrd', default=self._defaults['initrd'], action='store_true',
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)
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parser.add_argument(
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'-K', '--kernel-custom-config-file', default=self._defaults['kernel_custom_config_file'],
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help='''\
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Ignore all default kernel configurations and use this file instead.
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Still uses options explicitly passed with `-C` and `-c` on top of it.
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'''
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)
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parser.add_argument(
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'-k', '--kernel-modules', default=self._defaults['kernel_modules'], action='store_true',
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help='''Reconfigure and rebuild the kernel modules package.
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Force --build-linux to true, since building the modules requires building Linux.
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'''
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)
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parser.add_argument(
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'--no-all', default=self._defaults['no_all'], action='store_true',
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help='''\
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Don't build the all target which normally gets build by default.
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That target builds the root filesystem and all its dependencies.
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'''
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)
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parser.add_argument(
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'--skip-configure', default=self._defaults['skip_configure'], action='store_true',
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help='''\
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Skip the Buildroot configuration. Saves a few seconds,
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but requires you to know what you are doing :-)
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'''
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)
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parser.add_argument(
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'extra_make_args', default=self._defaults['extra_make_args'], metavar='extra-make-args', nargs='*',
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help='''\
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Extra arguments to be passed to the Buildroot make,
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usually extra Buildroot targets.
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'''
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)
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def do_build(self, args):
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build_dir = self.get_build_dir(args)
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os.makedirs(common.out_dir, exist_ok=True)
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extra_make_args = args.extra_make_args.copy()
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if args.kernel_modules:
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args.build_linux = True
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extra_make_args.append('lkmc-reconfigure')
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if args.build_linux:
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extra_make_args.append('linux-reconfigure')
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if args.gem5:
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extra_make_args.append('gem5-reconfigure')
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if args.arch == 'x86_64':
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defconfig = 'qemu_x86_64_defconfig'
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elif args.arch == 'arm':
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defconfig = 'qemu_arm_vexpress_defconfig'
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elif args.arch == 'aarch64':
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defconfig = 'qemu_aarch64_virt_defconfig'
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# Configure.
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if not args.skip_configure:
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br2_external_dirs = []
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packages_dir = os.path.join(common.root_dir, 'packages')
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for package_dir in os.listdir(packages_dir):
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package_dir_abs = os.path.join(packages_dir, package_dir)
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if os.path.isdir(package_dir_abs):
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br2_external_dirs.append(self._path_relative_to_buildroot(package_dir_abs))
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br2_external_str = ':'.join(br2_external_dirs)
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common.run_cmd(
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[
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'make',
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'O={}'.format(common.buildroot_build_dir),
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'BR2_EXTERNAL={}'.format(br2_external_str),
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defconfig,
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],
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cwd=common.buildroot_src_dir,
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)
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buildroot_configs = args.buildroot_config
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buildroot_configs.extend([
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'BR2_JLEVEL={}'.format(args.nproc),
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'BR2_DL_DIR="{}"'.format(common.buildroot_download_dir),
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])
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common.write_configs(common.buildroot_config_file, buildroot_configs)
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if not args.build_linux:
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buildroot_configs.extend([
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'# BR2_LINUX_KERNEL is not set',
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])
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if not args.baseline:
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buildroot_configs.extend([
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'BR2_GLOBAL_PATCH_DIR="{}"'.format(
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self._path_relative_to_buildroot(os.path.join(common.root_dir, 'patches', 'global'))
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),
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'BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="{}"'.format(
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self._path_relative_to_buildroot(os.path.join(common.root_dir, 'busybox_config_fragment'))
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),
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'BR2_PACKAGE_OVERRIDE_FILE="{}"'.format(
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self._path_relative_to_buildroot(os.path.join(common.root_dir, 'buildroot_override'))
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),
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'BR2_ROOTFS_OVERLAY="{} {}"'.format(
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self._path_relative_to_buildroot(common.rootfs_overlay_dir),
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self._path_relative_to_buildroot(common.out_rootfs_overlay_dir),
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),
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'BR2_ROOTFS_POST_BUILD_SCRIPT="{}"'.format(
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self._path_relative_to_buildroot(os.path.join(common.root_dir, 'rootfs-post-build-script'))
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),
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'BR2_ROOTFS_USERS_TABLES="{}"'.format(
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self._path_relative_to_buildroot(os.path.join(common.root_dir, 'user_table'))
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),
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])
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if args.kernel_modules:
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buildroot_configs.append('BR2_PACKAGE_LKMC=y')
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if args.gem5:
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buildroot_configs.append('BR2_PACKAGE_GEM5=y')
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if args.initramfs:
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buildroot_configs.extend([
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'BR2_TARGET_ROOTFS_CPIO=n',
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'BR2_TARGET_ROOTFS_EXT2=n',
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'BR2_TARGET_ROOTFS_INITRAMFS=y',
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])
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if args.initrd:
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buildroot_configs.extend([
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'BR2_TARGET_ROOTFS_CPIO=y',
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'BR2_TARGET_ROOTFS_EXT2=n'
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'BR2_TARGET_ROOTFS_INITRAMFS=n',
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])
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buildroot_config_fragments = [
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os.path.join(common.root_dir, 'buildroot_config', 'default')
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] + args.buildroot_config_fragment
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# Decide kernel configuration.
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kernel_config_fragments = []
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if True:
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# CLI kernel configurations.
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kernel_config_fragment_cli_path = os.path.join(common.buildroot_build_dir, 'lkmc_kernel_config_fragment_cli')
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kernel_config_cli_str = '\n'.join(args.kernel_config)
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do_write = False
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if os.path.exists(kernel_config_fragment_cli_path):
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with open(kernel_config_fragment_cli_path, 'r') as kernel_config_fragment_cli_file:
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kernel_config_cli_str_old = kernel_config_fragment_cli_file.read()
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if kernel_config_cli_str != kernel_config_cli_str_old:
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do_write = True
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else:
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do_write = True
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if do_write:
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# Only update if modified, otherwise Buildroot tries to
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# rebuilds the kernel every time, which takes a few seconds.
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# even when the kernel has already been built.
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with open(kernel_config_fragment_cli_path, 'w') as kernel_config_fragment_cli_file:
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kernel_config_fragment_cli_file.write(kernel_config_cli_str)
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kernel_config_fragments.append(os.path.join(kernel_config_fragment_cli_path))
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if True:
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# Kernel configuration fragments.
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if args.kernel_custom_config_file is not None:
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if os.path.exists(args.kernel_custom_config_file):
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buildroot_configs.extend([
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'BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y',
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'BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE=\"{}\"'.format(args.kernel_custom_config_file),
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])
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if args.build_linux:
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pathlib.Path(args.kernel_custom_config_file).touch()
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else:
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raise Exception('Kernel config fragment file does not exist: {}'.format(args.kernel_custom_config_file))
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default_kernel_config_fragments = []
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else:
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default_kernel_config_fragments = ['min', 'default']
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if args.build_linux:
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# https://stackoverflow.com/questions/49260466/why-when-i-change-br2-linux-kernel-custom-config-file-and-run-make-linux-reconfi
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pathlib.Path(os.path.join(common.linux_config_dir, 'min')).touch()
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for i, default_kernel_config_fragment in enumerate(default_kernel_config_fragments):
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default_kernel_config_fragments[i] = os.path.join(common.linux_config_dir, default_kernel_config_fragment)
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kernel_config_fragments.extend(default_kernel_config_fragments)
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for i, frag in enumerate(kernel_config_fragments):
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kernel_config_fragments[i] = self._path_relative_to_buildroot(frag)
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buildroot_kernel_config_fragment_str = 'BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="{}"'.format(' '.join(kernel_config_fragments))
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buildroot_configs.append(buildroot_kernel_config_fragment_str)
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common.write_configs(common.buildroot_config_file, buildroot_configs, buildroot_config_fragments)
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common.run_cmd(
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[
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'make',
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'O={}'.format(common.buildroot_build_dir),
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'olddefconfig',
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],
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cwd=common.buildroot_src_dir,
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)
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# Do the actual build.
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common.make_build_dirs()
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if not args.no_all:
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extra_make_args.append('all')
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common.run_cmd(
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[
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'make',
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'LKMC_GEM5_SRCDIR="{}"'.format(common.gem5_src_dir),
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'LKMC_PARSEC_BENCHMARK_SRCDIR="{}"'.format(common.parsec_benchmark_src_dir),
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'O={}'.format(common.buildroot_build_dir),
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'V={}'.format(int(args.verbose)),
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] +
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extra_make_args
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,
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out_file=os.path.join(common.buildroot_build_dir, 'lkmc.log'),
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delete_env=['LD_LIBRARY_PATH'],
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cwd=common.buildroot_src_dir,
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)
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# Create the qcow2 from ext2.
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# Skip if qemu is not present, because gem5 does not need the qcow2.
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# so we don't force a QEMU build for gem5.
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if not args.no_all and os.path.exists(common.qemu_img_executable):
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common.raw_to_qcow2()
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def get_argparse_args(self):
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return {
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'description': '''\
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Run Linux on an emulator
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'''
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}
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def get_build_dir(self, args):
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return common.buildroot_build_dir
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_defaults = {
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'baseline': False,
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'build_linux': False,
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'buildroot_config': [],
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'buildroot_config_fragment': [],
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'initramfs': False,
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'initrd': False,
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'kernel_config': [],
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'kernel_config_fragment': [],
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'kernel_custom_config_file': None,
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'kernel_modules': False,
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'no_all': False,
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'skip_configure': False,
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'extra_make_args': [],
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}
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def _path_relative_to_buildroot(self, abspath):
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return os.path.relpath(abspath, common.buildroot_src_dir)
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if __name__ == '__main__':
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BuildrootComponent().build()
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