OSDev.org

We have success! Attached is the contents of the screen. I've transcribed it by hand, so there might be a mistake or two (but I hope not).

Great, I will start investigating. I'll post as soon as I have tackled this problem.

Again thanks for the effort.

Hi JackScott

I have improved my memory initialization routine and it should work now. I have uploaded the newest binaries. This time 2 versions: a normal version and one that will not obscure the kernel output during startup.

As far as I can tell the data you gave me was perfectly transcribed. But I forgot to print out the types previously. They are printed now. So if you find time to test it again could you please provide me with the types of the memory blocks too, thanks.

clange

I've tested the normal image now and it works fine. Nice work! I've played around a bit with the commands in the shell, they all seem to work fine with no problems (only limited of course by what is currently implemented). I played Tetris for a while, it seems to work alright. The 'full lines' thing never seemed to increment though. I'm not sure whether that is deliberate or a bug (I know I filled up about 10 lines at least).

If you still want me to test the version that prints a memory map, let me know.

Hi

Glad to hear that it works. If you could just give me the type of the memory map entries. You should find them by pressing ctrl-1 to display the kernel console and they should be display at the top. It doesn't matter if the first few entries are missing if they have scrolled of the screen.

I forgot to implemented counting of lines in Tetris. But I have added it to the todo list. I also need to improve the game play a bit. Levels etc.

And one more thing: what CPU speed is detected (si command, cpu tab)?

Thanks, clange

Attached is the updated memory map.
The CPU speed reported is 899.995MHz, which is half of what the CPU is meant for (1.8GHz).

Thanks for all the help

I have integrated your memory map in my unit tests so hopefully it will now continue working on your machine.

Merry Christmas

clange

JackScott wrote:The CPU speed reported is 899.995MHz, which is half of what the CPU is meant for (1.8GHz).

Are you running a dual-core box? That's probably the problem.

I'm thinking more something that'll reduce the CPU clock speed to keep it cooler. Except I thought all of those were controlled by the OS, not by the hardware itself.

Hmm, interesting thoughts.

It is indeed a dual-core box. Pentium E2160.

@Troy Martin:

I'm sure that it is my code that is wrong. It shows half the speed in VMware and on my own machine too. I'm usin the PIT as a timer and the RDTSC to get a clock tick delta. I suspect that I have selected the wrong timer mode and is counting each tick twice - that would explain it. But I just adjusted my calculations instead.

pcmattman wrote:I'm thinking more something that'll reduce the CPU clock speed to keep it cooler.

Haha, I doubt it. The machine is watercooled.

Haha, ok - OT, how hot does it run on average? The only other possibility I can think of is speed stepping, but I can't remember if that's something the OS initialises and controls or if it's hardware controlled.

It's only turned on for OSDev testing, so the machine hardly has time to warm up from room temperature before I turn it off again. The hottest I've ever watched it get was 40 degrees centigrade.