一个叫Fabrice Bellard的程序员写了一段Javascript在Web浏览器中启动Linux(原网页，我把这个网页iframe在了下面)，目前，你只能使用Firefox 4和Chrome 11运行这个Linux。这不是什么假的模仿Linux的东西，这是实实在在的运行一个Linux。这一举动还引起了很多很牛人的关注，包括Javascript的创建者Brendan Eich。
- IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
- TCP established hash table entries: 1024 (order: 0, 4096 bytes)
- TCP bind hash table entries: 512 (order: -1, 2048 bytes)
- TCP: Hash tables configured (established 1024 bind 512)
- TCP reno registered
- checking if image is initramfs...it isn't (bad gzip magic numbers); looks like a
- n initrd
- Freeing initrd memory: 2048k freed
- Total HugeTLB memory allocated, 0
- io scheduler noop registered
- io scheduler anticipatory registered
- io scheduler deadline registered
- io scheduler cfq registered (default)
- Real Time Clock Driver v1.12ac
- JS clipboard: I/O at 0x03c0
- Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled
- serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16450
- RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
- loop: loaded (max 8 devices)
- TCP cubic registered
- NET: Registered protocol family 1
- NET: Registered protocol family 17
- Using IPI Shortcut mode
- Time: pit clocksource has been installed.
- RAMDISK: ext2 filesystem found at block 0
- RAMDISK: Loading 2048KiB [1 disk] into ram disk... done.
- VFS: Mounted root (ext2 filesystem).
- Freeing unused kernel memory: 124k freed
- W
- IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
- TCP established hash table entries: 1024 (order: 0, 4096 bytes)
- TCP bind hash table entries: 512 (order: -1, 2048 bytes)
- TCP: Hash tables configured (established 1024 bind 512)
- TCP reno registered
- checking if image is initramfs...it isn't (bad gzip magic numbers); looks like a
- n initrd
- Freeing initrd memory: 2048k freed
- Total HugeTLB memory allocated, 0
- io scheduler noop registered
- io scheduler anticipatory registered
- io scheduler deadline registered
- io scheduler cfq registered (default)
- Real Time Clock Driver v1.12ac
- JS clipboard: I/O at 0x03c0
- Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled
- serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16450
- RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
- loop: loaded (max 8 devices)
- TCP cubic registered
- NET: Registered protocol family 1
- NET: Registered protocol family 17
- Using IPI Shortcut mode
- Time: pit clocksource has been installed.
- RAMDISK: ext2 filesystem found at block 0
- RAMDISK: Loading 2048KiB [1 disk] into ram disk... done.
- VFS: Mounted root (ext2 filesystem).
- Freeing unused kernel memory: 124k freed
- Welcome to JS/Linux
随后，Fabrice Bellard发布了相关的技术说明：http://bellard.org/jslinux/tech.html，从这份文档中我们可以看到：
这个模似器完全由Javascript写成
CPU仿真器使用的是QEMU(接近于原古的486)，为了装上Linux，其做了一些改动。
Javascript的终端本来可以使用termlib，但他还是自己写了一个，因为OS的按键和Web浏览器不一样(here)
Linux 使用了2.6.20内核，编译配置在这里，并做了一些小改动。
磁盘用的是Ram Disk，在启动的时候装载。其文件系统由Buildroot 和BusyBox产生。
在Home目录下有一个hello.c的程序，你可以使用TinyCC编译(tcc，参看酷壳的这篇文章)
从这个事我有这些感触，
在Web上运行一个Linux的操作系统不是问题。那么在Web上还有什么不能做的吗?
Linux真是性能很高，在Javascript下运行感觉也不慢啊。
真是Techno-Geek。
原文链接：http://coolshell.cn/articles/4722.html#more-4722
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