Hello World!
Many of us wanted their own Linux machine to do some C programming or at least to get a feel of the Linux Operating System.
Here is a Linux machine which can be accessible over the internet free of cost only for you :-).
Just type the following URL in the browser and here you are in your own Linux machine:
http://bellard.org/jslinux/
This is an amaizing work by Bellard. There is also a clipboard facility to copy/paste your work back and forth between your local system and the Linux machine.
Copy your file to the clipboard:
Explore this machine, and I am sure you will have lots of fun. The best part is that there is a C Compiler to test your own C programs.
It's a tiny version of a C compiler called "tcc".
To have a deep dive into the booting process of this OS, look at the booting sequence:
Enjoy this. We shall explore more later.
Many of us wanted their own Linux machine to do some C programming or at least to get a feel of the Linux Operating System.
Here is a Linux machine which can be accessible over the internet free of cost only for you :-).
Just type the following URL in the browser and here you are in your own Linux machine:
http://bellard.org/jslinux/
This is an amaizing work by Bellard. There is also a clipboard facility to copy/paste your work back and forth between your local system and the Linux machine.
Copy your file to the clipboard:
cat myfile > /dev/clipboard
Explore this machine, and I am sure you will have lots of fun. The best part is that there is a C Compiler to test your own C programs.
It's a tiny version of a C compiler called "tcc".
To have a deep dive into the booting process of this OS, look at the booting sequence:
Linux version 2.6.20 (bellard@voyager) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-9)) #2 Mon Aug 8 23:51:02 CEST 2011
BIOS-provided physical RAM map:
sanitize start
sanitize bail 0
BIOS-e801: 0000000000000000 - 000000000009f000 (usable)
BIOS-e801: 0000000000100000 - 0000000001000000 (usable)
16MB LOWMEM available.
Entering add_active_range(0, 0, 4096) 0 entries of 256 used
Zone PFN ranges:
DMA 0 -> 4096
Normal 4096 -> 4096
early_node_map[1] active PFN ranges
0: 0 -> 4096
On node 0 totalpages: 4096
DMA zone: 32 pages used for memmap
DMA zone: 0 pages reserved
DMA zone: 4064 pages, LIFO batch:0
Normal zone: 0 pages used for memmap
DMI not present or invalid.
Allocating PCI resources starting at 10000000 (gap: 01000000:ff000000)
Detected 3.333 MHz processor.
Built 1 zonelists. Total pages: 4064
Kernel command line: console=ttyS0 root=/dev/ram0 rw init=/sbin/init notsc=1
Initializing CPU#0
Disabling TSC...
PID hash table entries: 64 (order: 6, 256 bytes)
Console: colour dummy device 80x25
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
Memory: 11956k/16384k available (1265k kernel code, 4040k reserved, 324k data, 124k init, 0k highmem)
virtual kernel memory layout:
fixmap : 0xffffc000 - 0xfffff000 ( 12 kB)
vmalloc : 0xc1800000 - 0xffffa000 ( 999 MB)
lowmem : 0xc0000000 - 0xc1000000 ( 16 MB)
.init : 0xc0290000 - 0xc02af000 ( 124 kB)
.data : 0xc023c503 - 0xc028d854 ( 324 kB)
.text : 0xc0100000 - 0xc023c503 (1265 kB)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 20.22 BogoMIPS (lpj=101116)
Mount-cache hash table entries: 512
CPU: After generic identify, caps: 00000010 00000000 00000000 00000000 00000000 00000000 00000000
Intel Pentium with F0 0F bug - workaround enabled.
CPU: After all inits, caps: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Compat vDSO mapped to ffffe000.
CPU: Intel Pentium MMX stepping 03
Checking 'hlt' instruction... OK.
NET: Registered protocol family 16
Setting up standard PCI resources
NET: Registered protocol family 2
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 an 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.
EXT2-fs warning: maximal mount count reached, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 124k freed
BIOS-provided physical RAM map:
sanitize start
sanitize bail 0
BIOS-e801: 0000000000000000 - 000000000009f000 (usable)
BIOS-e801: 0000000000100000 - 0000000001000000 (usable)
16MB LOWMEM available.
Entering add_active_range(0, 0, 4096) 0 entries of 256 used
Zone PFN ranges:
DMA 0 -> 4096
Normal 4096 -> 4096
early_node_map[1] active PFN ranges
0: 0 -> 4096
On node 0 totalpages: 4096
DMA zone: 32 pages used for memmap
DMA zone: 0 pages reserved
DMA zone: 4064 pages, LIFO batch:0
Normal zone: 0 pages used for memmap
DMI not present or invalid.
Allocating PCI resources starting at 10000000 (gap: 01000000:ff000000)
Detected 3.333 MHz processor.
Built 1 zonelists. Total pages: 4064
Kernel command line: console=ttyS0 root=/dev/ram0 rw init=/sbin/init notsc=1
Initializing CPU#0
Disabling TSC...
PID hash table entries: 64 (order: 6, 256 bytes)
Console: colour dummy device 80x25
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
Memory: 11956k/16384k available (1265k kernel code, 4040k reserved, 324k data, 124k init, 0k highmem)
virtual kernel memory layout:
fixmap : 0xffffc000 - 0xfffff000 ( 12 kB)
vmalloc : 0xc1800000 - 0xffffa000 ( 999 MB)
lowmem : 0xc0000000 - 0xc1000000 ( 16 MB)
.init : 0xc0290000 - 0xc02af000 ( 124 kB)
.data : 0xc023c503 - 0xc028d854 ( 324 kB)
.text : 0xc0100000 - 0xc023c503 (1265 kB)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 20.22 BogoMIPS (lpj=101116)
Mount-cache hash table entries: 512
CPU: After generic identify, caps: 00000010 00000000 00000000 00000000 00000000 00000000 00000000
Intel Pentium with F0 0F bug - workaround enabled.
CPU: After all inits, caps: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Compat vDSO mapped to ffffe000.
CPU: Intel Pentium MMX stepping 03
Checking 'hlt' instruction... OK.
NET: Registered protocol family 16
Setting up standard PCI resources
NET: Registered protocol family 2
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 an 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.
EXT2-fs warning: maximal mount count reached, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 124k freed
Enjoy this. We shall explore more later.
1 comment:
Oh wow. You noticed Linux is free. Of course Bellards work is a javascript _miracle_ but it is not a machine and doesn't come close. It won't even survive a page refresh - probably will die if anything in the browser gets borked (I'd suggest trying out whether it will survive a standby/wakeup). Also, there will be little or no room (root has 240kb free, tmp 6M; memory is emulated at 16Mb with no swap (good luck compiling more than hello world).
It will be much cheaper to install linux (FOR FREE - yay) on your physical machines. It'll only require about 1 GB and you'll have all the power of the machine to play with. Oh, but you work on many machines? So, mail the stuff around. After all, with the javascript demo you'd be copy - pasting anyway.
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