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https://github.com/RGBCube/serenity
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SystemServer: Create /dev/devctl and create devices based on its events
We first create the /dev/devctl based on the information from the SysFS. Then, we create block devices and character devices based on the events we read from that device.
This commit is contained in:
Liav A
Linus Groh
parent
eaad77b286
commit
4da7b543c6
1 changed files with 159 additions and 122 deletions
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@ -9,6 +9,7 @@
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#include <AK/Assertions.h>
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#include <AK/ByteBuffer.h>
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#include <AK/Debug.h>
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#include <Kernel/API/DeviceEvent.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/ConfigFile.h>
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#include <LibCore/DirIterator.h>
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@ -132,45 +133,13 @@ static void create_devtmpfs_block_device(String name, mode_t mode, unsigned majo
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VERIFY_NOT_REACHED();
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}
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static void populate_devtmpfs_block_devices()
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{
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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_devtmpfs_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 30: {
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create_devtmpfs_block_device(String::formatted("/dev/kcov{}", minor_number), 0666, 30, minor_number);
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break;
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}
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case 3: {
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create_devtmpfs_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_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 create_devtmpfs_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, makedev(major, minor)); rc < 0)
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VERIFY_NOT_REACHED();
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}
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static void populate_devtmpfs_char_devices()
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static void populate_devtmpfs_char_devices_based_on_sysfs()
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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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@ -183,10 +152,10 @@ static void populate_devtmpfs_char_devices()
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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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case 2: {
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switch (minor_number) {
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case 42: {
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create_devtmpfs_char_device("/dev/audio", 0220, 42, 42);
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case 10: {
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create_devtmpfs_char_device("/dev/devctl", 0660, 2, 10);
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break;
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}
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default:
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@ -194,7 +163,48 @@ static void populate_devtmpfs_char_devices()
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}
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break;
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}
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default:
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break;
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}
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}
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}
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static void populate_devtmpfs_devices_based_on_devctl()
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{
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auto f = Core::File::construct("/dev/devctl");
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if (!f->open(Core::OpenMode::ReadOnly)) {
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warnln("Failed to open /dev/devctl - {}", f->error_string());
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VERIFY_NOT_REACHED();
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}
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DeviceEvent event;
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while (f->read((u8*)&event, sizeof(DeviceEvent)) > 0) {
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if (event.state != DeviceEvent::Inserted)
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continue;
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auto major_number = event.major_number;
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auto minor_number = event.minor_number;
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bool is_block_device = (event.is_block_device == 1);
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switch (major_number) {
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case 42: {
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if (!is_block_device) {
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switch (minor_number) {
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case 42: {
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create_devtmpfs_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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}
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break;
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}
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case 29: {
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if (is_block_device) {
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create_devtmpfs_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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switch (minor_number) {
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case 0: {
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create_devtmpfs_char_device("/dev/full", 0660, 29, 0);
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@ -206,115 +216,142 @@ static void populate_devtmpfs_char_devices()
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break;
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}
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case 229: {
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create_devtmpfs_char_device(String::formatted("/dev/hvc0p{}", minor_number), 0666, major_number, minor_number);
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if (!is_block_device) {
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create_devtmpfs_char_device(String::formatted("/dev/hvc0p{}", minor_number), 0666, 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_devtmpfs_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_devtmpfs_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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if (!is_block_device) {
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switch (minor_number) {
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case 0: {
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create_devtmpfs_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_devtmpfs_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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}
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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_devtmpfs_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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if (!is_block_device) {
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switch (minor_number) {
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case 0: {
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create_devtmpfs_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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}
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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_devtmpfs_char_device("/dev/zero", 0666, 1, 5);
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break;
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if (!is_block_device) {
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switch (minor_number) {
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case 5: {
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create_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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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}
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case 1: {
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create_devtmpfs_char_device("/dev/mem", 0660, 1, 1);
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break;
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break;
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}
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case 30: {
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if (is_block_device) {
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create_devtmpfs_block_device(String::formatted("/dev/kcov{}", minor_number), 0666, 30, minor_number);
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}
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case 3: {
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create_devtmpfs_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_devtmpfs_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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break;
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}
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case 3: {
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if (is_block_device) {
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create_devtmpfs_block_device(String::formatted("/dev/hd{}", offset_character_with_number('a', minor_number)), 0600, 3, minor_number);
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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_devtmpfs_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_devtmpfs_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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if (!is_block_device) {
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switch (minor_number) {
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case 1: {
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create_devtmpfs_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_devtmpfs_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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}
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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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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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if (!is_block_device) {
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switch (minor_number) {
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case 0: {
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create_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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_devtmpfs_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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}
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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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if (!is_block_device)
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warnln("Unknown character device {}:{}", major_number, minor_number);
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else
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warnln("Unknown block device {}:{}", major_number, minor_number);
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break;
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}
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}
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@ -324,8 +361,8 @@ static void populate_devtmpfs()
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{
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mode_t old_mask = umask(0);
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printf("Changing umask %#o\n", old_mask);
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populate_devtmpfs_char_devices();
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populate_devtmpfs_block_devices();
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populate_devtmpfs_char_devices_based_on_sysfs();
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populate_devtmpfs_devices_based_on_devctl();
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umask(old_mask);
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}
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