What all do I need to achieve this?

TheChuckster · Post by **TheChuckster** » Thu Aug 21, 2003 8:37 am

I have no idea what solar said (before the edit), but nonetheless my respect of him has vanished.

Solar · Post by **Solar** » Thu Aug 21, 2003 10:47 am

TheChuckster wrote: ...nonetheless my respect of him has vanished.

Nice. Thanks for being such an understanding pal.

The comment I edited away because I did not really want to offend you was, "there is usually a reason why there is a FAQ or a thread that is made sticky by the moderators so it always shows up on top". I also removed the boldface "obviously" from the part that's still there.

Remember me not to help next time you ask for help, because you can't stand the criticism.

>:(

TheChuckster · Post by **TheChuckster** » Thu Aug 21, 2003 11:47 am

Oh. I misunderstood you then. It seemed as if you said something that intended to be harmful (aka "finger of justice) to flame me. Then I thought the mods got to it and editted out before I could read it. Sorry.

Solar · Post by **Solar** » Thu Aug 21, 2003 2:06 pm

TheChuckster wrote: Oh. I misunderstood you then. It seemed as if you said something that intended to be harmful (aka "finger of justice) to flame me.

Nope, just worded it a bit more harsh than strictly necessary.

I'm glad that's settled. :-\

beyond infinity lazy · Fri Aug 22, 2003 12:06 am

@chuckster: ];->

I sometimes use words full of flowers and figures, and this might lead to misunderstanding. Sorry for that.

Pype.Clicker · Post by **Pype.Clicker** » Fri Aug 22, 2003 1:20 am

glad to see everyone is happy again. let's move back to OSdev class ...

TheChuckster · Post by **TheChuckster** » Fri Aug 22, 2003 8:47 am

All right. I got all that down. I've read the tutorials on osdever.net on IDTs, but they are above my head. Considering such a simple subject is above my head, should I give up? :-[ Well, I've gotten so far (memory manager, display driver, keyboard driver, "floppy driver" that turns on motor and seeks tracks ;D) to my goal of loading external programs. But I still have plenty of roadblocks to confuse me with filesystems, DMA, ISRs, flat binary loading.

Any how. As much as I hate to use copied code, I had to borrow Code Slasher's code because I have no other option if I'd like to move on. Well. I have remapped the PICs to start the IRQs at interrupt 0x20 then 0x28. Then I do:

outportb(PIC1 + 1, 0xFF);

This disables all IRQs. Later on I'd like to enable IRQ0, but I don't know how. ??? Also, calling

asm("sti");

causes Bochs to panic. Can't do that so how do I enable interrupts? Is that even necessary? (I am in PMode of course.)

Last, where am I supposed to get an IDT (obviously I lack the skill to code my own)?! I found a tutorial on one that calls exception ISRs, but my dreaded copy and paste method just gave me an invalid executable format error.

I've read everything at osdever.net and looked at older posts on this forum. All above my head.

Like I said, if this is too advanced for me, tell me and I'll stop. Why waste my time with something I can't do?

Solar · Post by **Solar** » Fri Aug 22, 2003 10:53 am

Have you downloaded / ordered the Intel manuals (as linked in post #1 of the Quick Links)? Knowing the CPU is usually a prerequisite for getting a kernel to work.

bkilgore · Post by **bkilgore** » Fri Aug 22, 2003 3:39 pm

TheChuckster wrote: I've read the tutorials on osdever.net on IDTs, but they are above my head. Considering such a simple subject is above my head, should I give up? :-[

-- snip --

...if this is too advanced for me, tell me and I'll stop. Why waste my time with something I can't do?

I don't think finding something as complex as operating system development confusing is a very good reason to give up on it. You're definitely going to find yourself confused on things a lot as you progress, I know I have. Even if it seems like a simple concept or idea, it doesn't necessarily mean it will be easy to figure out. Conversely, sometimes you'll find that things you thought would be difficult turn out to be easier than expected.

So being confused is not a good reason in itself to think you should give up. But you seem to be very eager to give up, in many of your posts that i've read you mention that you're frustrated and ready to give up. So maybe you do need to look at how committed you are to really following through on it. Personally seeing some of the code you've written and the ideas you have on the board, I think you got what it takes if you really want to, but it's your own decision to quit or keep going.

TheChuckster · Post by **TheChuckster** » Fri Aug 22, 2003 5:02 pm

Well. I found a good temporary solution to no IDT, and thus no timer. I found a snippet that uses the RTC for delays (inaccurate, but it works). At least I'll be able to move on.

Pype.Clicker · Post by **Pype.Clicker** » Sat Aug 23, 2003 5:20 am

there are some small-but-working ASM idt code in this week posts ... http://www.mega-tokyo.com/forum/index.p ... eadid=4173

maybe this can help.

You can re-enable interrupt #i on master with

Code: Select all

current_mask&=~(1<<i)
out(0x21,current_mask);

(i.e. clearing bit I

)

OSDev.org

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