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https://github.com/RGBCube/serenity
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SystemServer: Traverse sub-directories in /sys/dev
While traversing in both /sys/dev/char and /sys/dev/block, SystemServer populates the DevFS (mounted normally in /dev) with the corresponding device nodes. This is a very crude implementation of populating DevFS device nodes, before we have a full-fledged udev-like daemon to take care of this task. Also, we don't populate DiskPartition device nodes yet, because that requires more sophisticated mechanism to figure out which DiskPartition is related to which StorageDevice.
This commit is contained in:
Liav A
Andreas Kling
parent
6a9c717a30
commit
f52d102270
1 changed files with 214 additions and 50 deletions
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@ -108,72 +108,236 @@ constexpr unsigned encoded_device(unsigned major, unsigned minor)
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return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
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}
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inline char offset_character_with_number(char base_char, u8 offset)
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{
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char offseted_char = base_char;
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VERIFY(static_cast<size_t>(offseted_char) + static_cast<size_t>(offset) < 256);
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offseted_char += offset;
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return offseted_char;
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}
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static void create_devfs_block_device(String name, mode_t mode, unsigned major, unsigned minor)
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{
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if (auto rc = mknod(name.characters(), mode | S_IFBLK, encoded_device(major, minor)); rc < 0)
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VERIFY_NOT_REACHED();
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}
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static void populate_devfs_block_devices()
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{
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struct stat cur_file_stat;
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Core::DirIterator di("/sys/dev/block/", Core::DirIterator::SkipParentAndBaseDir);
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if (di.has_error()) {
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warnln("Failed to open /sys/dev/block - {}", di.error());
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VERIFY_NOT_REACHED();
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}
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while (di.has_next()) {
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auto entry_name = di.next_path().split(':');
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VERIFY(entry_name.size() == 2);
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auto major_number = entry_name[0].to_uint<unsigned>().value();
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auto minor_number = entry_name[1].to_uint<unsigned>().value();
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switch (major_number) {
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case 29: {
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create_devfs_block_device(String::formatted("/dev/fb{}", minor_number), 0666, 29, minor_number);
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break;
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}
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case 3: {
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create_devfs_block_device(String::formatted("/dev/hd{}", offset_character_with_number('a', minor_number)), 0600, 3, minor_number);
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break;
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}
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default:
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warnln("Unknown block device {}:{}", major(cur_file_stat.st_rdev), minor(cur_file_stat.st_rdev));
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break;
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}
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}
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}
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static void create_devfs_char_device(String name, mode_t mode, unsigned major, unsigned minor)
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{
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if (auto rc = mknod(name.characters(), mode | S_IFCHR, encoded_device(major, minor)); rc < 0)
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VERIFY_NOT_REACHED();
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}
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static void populate_devfs_char_devices()
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{
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Core::DirIterator di("/sys/dev/char/", Core::DirIterator::SkipParentAndBaseDir);
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if (di.has_error()) {
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warnln("Failed to open /sys/dev/char - {}", di.error());
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VERIFY_NOT_REACHED();
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}
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while (di.has_next()) {
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auto entry_name = di.next_path().split(':');
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VERIFY(entry_name.size() == 2);
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auto major_number = entry_name[0].to_uint<unsigned>().value();
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auto minor_number = entry_name[1].to_uint<unsigned>().value();
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switch (major_number) {
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case 42: {
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switch (minor_number) {
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case 42: {
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create_devfs_char_device("/dev/audio", 0220, 42, 42);
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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break;
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}
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case 29: {
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switch (minor_number) {
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case 0: {
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create_devfs_char_device("/dev/full", 0660, 29, 0);
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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break;
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}
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case 229: {
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switch (minor_number) {
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case 0: {
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create_devfs_char_device("/dev/hvc0p0", 0666, 229, 0);
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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break;
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}
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case 10: {
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switch (minor_number) {
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case 0: {
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create_devfs_char_device("/dev/mouse0", 0660, 10, 0);
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break;
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}
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case 183: {
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create_devfs_char_device("/dev/hwrng", 0660, 10, 183);
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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break;
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}
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case 85: {
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switch (minor_number) {
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case 0: {
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create_devfs_char_device("/dev/keyboard0", 0660, 85, 0);
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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break;
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}
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case 1: {
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switch (minor_number) {
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case 5: {
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create_devfs_char_device("/dev/zero", 0666, 1, 5);
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break;
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}
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case 1: {
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create_devfs_char_device("/dev/mem", 0660, 1, 1);
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break;
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}
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case 3: {
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create_devfs_char_device("/dev/null", 0666, 1, 3);
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break;
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}
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case 8: {
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create_devfs_char_device("/dev/random", 0666, 1, 8);
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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break;
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}
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break;
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}
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case 5: {
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switch (minor_number) {
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case 1: {
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create_devfs_char_device("/dev/console", 0666, 5, 1);
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break;
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}
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case 2: {
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create_devfs_char_device("/dev/ptmx", 0666, 5, 2);
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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break;
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}
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case 4: {
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switch (minor_number) {
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case 0: {
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create_devfs_char_device("/dev/tty0", 0620, 4, 0);
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break;
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}
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case 1: {
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create_devfs_char_device("/dev/tty1", 0620, 4, 1);
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break;
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}
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case 2: {
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create_devfs_char_device("/dev/tty2", 0620, 4, 2);
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break;
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}
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case 3: {
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create_devfs_char_device("/dev/tty3", 0620, 4, 3);
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break;
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}
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case 64: {
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create_devfs_char_device("/dev/ttyS0", 0620, 4, 64);
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break;
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}
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case 65: {
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create_devfs_char_device("/dev/ttyS1", 0620, 4, 65);
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break;
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}
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case 66: {
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create_devfs_char_device("/dev/ttyS2", 0620, 4, 66);
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break;
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}
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case 67: {
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create_devfs_char_device("/dev/ttyS3", 0666, 4, 67);
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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}
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break;
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}
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default:
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warnln("Unknown character device {}:{}", major_number, minor_number);
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break;
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}
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}
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}
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static void populate_devfs()
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{
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mode_t old_mask = umask(0);
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if (auto rc = mknod("/dev/audio", 0220 | S_IFCHR, encoded_device(42, 42)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/console", 0666 | S_IFCHR, encoded_device(5, 1)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/fb0", 0666 | S_IFBLK, encoded_device(29, 0)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/full", 0660 | S_IFCHR, encoded_device(29, 0)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/hda", 0600 | S_IFBLK, encoded_device(3, 0)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/hvc0p0", 0666 | S_IFCHR, encoded_device(229, 0)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/hwrng", 0666 | S_IFCHR, encoded_device(10, 183)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/keyboard0", 0660 | S_IFCHR, encoded_device(85, 0)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/mem", 0660 | S_IFCHR, encoded_device(1, 1)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/mouse0", 0660 | S_IFCHR, encoded_device(10, 0)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/null", 0666 | S_IFCHR, encoded_device(1, 3)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/ptmx", 0666 | S_IFCHR, encoded_device(5, 2)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/random", 0666 | S_IFCHR, encoded_device(1, 8)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/tty0", 0620 | S_IFCHR, encoded_device(4, 0)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/tty1", 0620 | S_IFCHR, encoded_device(4, 1)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/tty2", 0620 | S_IFCHR, encoded_device(4, 2)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/tty3", 0620 | S_IFCHR, encoded_device(4, 3)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/ttyS0", 0620 | S_IFCHR, encoded_device(4, 64)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/ttyS1", 0620 | S_IFCHR, encoded_device(4, 65)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/ttyS2", 0620 | S_IFCHR, encoded_device(4, 66)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/ttyS3", 0666 | S_IFCHR, encoded_device(4, 67)); rc < 0)
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VERIFY_NOT_REACHED();
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if (auto rc = mknod("/dev/zero", 0666 | S_IFCHR, encoded_device(1, 5)); rc < 0)
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VERIFY_NOT_REACHED();
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printf("Changing umask %#o\n", old_mask);
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populate_devfs_char_devices();
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populate_devfs_block_devices();
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umask(old_mask);
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}
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static void prepare_devfs()
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{
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// FIXME: Find a better way to all of this stuff, without hardcoding all of this!
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int rc = mount(-1, "/sys", "sys", 0);
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if (rc != 0) {
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VERIFY_NOT_REACHED();
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}
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int rc = mount(-1, "/dev", "dev", 0);
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rc = mount(-1, "/dev", "dev", 0);
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if (rc != 0) {
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VERIFY_NOT_REACHED();
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}
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populate_devfs();
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rc = mount(-1, "/sys", "sys", 0);
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if (rc != 0) {
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VERIFY_NOT_REACHED();
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}
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rc = mkdir("/dev/pts", 0755);
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if (rc != 0) {
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VERIFY_NOT_REACHED();
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