Mojo 0.1.2 released - please test and comment

[clange]

Hi

Release 0.1.2 of my hobby OS Mojo is ready. I have implemented all features
and fixed all the bugs mentioned in the discussion about the previous version.
I have also implemented some more items from my todo list and found and fixed
a few bugs. Everything is nicely on schedule for the next major release in
February

Please test it and let me know if you find any bugs or weird behaviour. I am
especially interested in results from booting on a real pc. All your feedback
gets top priority.

You can download floppy and ISO images from http://softwarewizard.dk/mojo/.

New features:
- Driver interrupts handled by simple VM instead of x86 handlers
- IRQ VM assembler
- Kernel timers: will send a message to user processes at fixed intervals
- Tetris game (uses timer)
- Supports both English and Danish in console and keyboard
- Keyboard handles all keys
- Tools to generate code pages and key mappings
- Nice startup screen and panic screen
- Lots of minor improvements

Old features:
- Micro kernel
- Preemptive multitasking
- Partial asynchronous IPC
- Simple shell and simple GUI applications
- Follows standards (libc, STL, POSIX)
- Good test coverage

Merry Christmas

clange

[JackScott]

Just tested using the .iso from your site on my OSDev testing machine #1 (see link below). I get the following panic right after GRUB loads the modules and the kernel starts:

PANIC: kernel::memory_init::calculate_physical_memory_info() => Weird memory size

I have to say though, very nice panic screen.

EDIT: Tried again with only 1 stick of RAM (256MiB), and I get the same error.

[clange]

The way I calculate the memory size is (too) simple. It is really one of the weak spots with regards to running on real hardware. I have written a small DOS tool to dump the BIOS memory map to a file so I can inspect it - I just have to polish it a bit. When I'm done I would appreciate if you could run it and email me the dump file. That way I can easily debug the problem. I have moved this to the top of my todo list and will post here when it is done.

Yeah I like the panic screen too - I thought that since I see it quite often it should at least look nice.

Thanks for testing.

[JackScott]

Unfortunately I don't have any OS installed on my test machine, and it doesn't have a floppy drive, so running a DOS-based tool is going to be difficult.

[clange]

I have compiled a version which prints the memory map. That will provide all the needed information. It can be downloaded from here http://softwarewizard.dk/mojo/index.php?page=download (version 0.1.3 alpha)

clange

[JackScott]

Nope, I still get the same kernel panic as before.

[clange]

Does it print a memory map? If it does could you please provide it to me.

[cyr1x]

Tested it on Virtual PC and I didn't mange it to crash (except with the double faule thingy).
I looks very cool. Keep up the good work.

[JackScott]

No, it doesn't print out anything. It just gets straight into the kernel and panics, doesn't show anything else. The memory map might flash up for half a second, but that's it.

[clange]

Hi cyr1x

Nice to hear that it also works on VirtualPC. It has been quite a while since I have used that as a test target. And thanks for the encouragement.

clange

[clange]

@JackScott:

I have uploaded another version. It should print the memory map provided by GRUB or print no memory map found. here is a screen shot of what it look like in Bochs except the panic message should be different

[JackScott]

Nope. Using the 0.1.3-alpha ISO image from your site, I still get the same as before: completely red panic screen, "Weird memory size" error.

[clange]

D'oh, I disabled the panic screen the wrong place. I have corrected it and this time I have also tested it correctly.
[EDIT] Well i didn't do it correctly after all

But thanks a bunch for testing - it is really cool that I can upload something to my page and a few hours later a guy (literally) on the other side of the earth helps me test it. Amazing experience

[JackScott]

No worries. Unfortunately I'm still not having any success with the latest image pulled from your site, it still panics to the red screen.

[clange]

Now the kernel will not switch VGA start address and will halt right after the memory map dump. I have downloaded the image from the homepage and tested that (I did that before too - but to no effect).

If this doesn't work I have no other choice than to blame Santa's elves for messing up the packages on the network