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 Post subject: [solved] I have followed a tutorial and it does not work
PostPosted: Wed Jul 24, 2019 6:54 am 
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Joined: Wed Jul 24, 2019 6:26 am
Posts: 2
I am fallowing the tutorial to build a kernel, http://www.jamesmolloy.co.uk/tutorial_html/, however, the kernel crashed on activated paging. the kernel crashed on executing the code
Code:
asm volatile("mov %0, %%cr0":: "r"(cr0));

what's up?


I used gdb to debug this kernel, and returned Cannot find bounds of current function, when executing this code.

i finally reached the part of multithread and could print A and B at the same time but without paging <_<. Thanks all, and good lucks.

Image

printed by A B C D four threads
Image


Solved finally!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

with paging,
Image

the heap
Image

user mode
Image


file system
Image
Image


Last edited by wellwell on Wed Sep 11, 2019 4:05 am, edited 12 times in total.

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 Post subject: Re: kernel crashed on activated paging
PostPosted: Wed Jul 24, 2019 6:59 am 
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Joined: Mon Mar 25, 2013 7:01 pm
Posts: 1637
Have you read this list of known bugs in the tutorial? Keep in mind this list is not complete.


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 Post subject: Re: kernel crashed on activated paging
PostPosted: Wed Jul 24, 2019 7:21 am 
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Joined: Wed Jul 24, 2019 6:26 am
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Octocontrabass wrote:
Have you read this list of known bugs in the tutorial? Keep in mind this list is not complete.

Many Thanks, Is there any other tutorials for beginner?


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 Post subject: Re: kernel crashed on activated paging
PostPosted: Wed Jul 24, 2019 8:38 am 
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Joined: Fri Oct 14, 2016 7:37 pm
Posts: 24
Location: Canada
Hello and welcome to OSDev.

I believe this humorously titled post may help: I have followed a tutorial and it does not work

Unfortunately, I must redirect you to this post Beginner Mistakes before you become utterly overwhelmed by this subject after spending countless hours going in circles. Please understand that this is a very difficult subject and there are no tutorials that can cover paging to the depth that it deserves.

OSDev tutorials should only serve as a jumping-off point in your development. I highly urge you to abandon any tutorial code after you have a general grasp on the topics. A good place to go after would be the Intel Software Developer Manuals (namely volume 3, section 4).

Good luck :D


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 Post subject: Re: kernel crashed on activated paging
PostPosted: Wed Jul 24, 2019 3:56 pm 
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Joined: Sun Jul 14, 2019 4:27 pm
Posts: 22
It is likely your paging structure is invalid or your GDT is set up incorrectly.

When I last did something like this I moved some code from NASM to GAS and bugs emerged from that (moving 5 in NASM means the value 5, in GAS the value at memory location 5). Check you are actually putting what you expect into each page table record.


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