Sorry to bother again, why can't i write anything to the VGA

[NeonLightions]

Hi,
Like the title. Can you help me? I'm getting crazy with it.
Here is my repo: https://github.com/NeonLightions/Amore-OS-x64

[Octocontrabass]

You're building 64-bit code but you never switch the CPU to 64-bit mode.

[NeonLightions]

You're building 64-bit code but you never switch the CPU to 64-bit mode.

Yes, I just haven't switched to 64-bit mode yet. But can I call C function before I switch to 64-bit mode?

[Octocontrabass]

Only if you compile said C function into 32-bit code.

It's better to just switch the CPU to 64-bit mode. Don't waste your time trying to mix 32-bit and 64-bit code.

[NeonLightions]

Only if you compile said C function into 32-bit code.

It's better to just switch the CPU to 64-bit mode. Don't waste your time trying to mix 32-bit and 64-bit code.

OK, I will notice that. Thank you.

[NeonLightions]

Only if you compile said C function into 32-bit code.

It's better to just switch the CPU to 64-bit mode. Don't waste your time trying to mix 32-bit and 64-bit code.

Hi,
I have entered long mode, but I still can't write anything to VGA buffer. Can you help me? I have updated repo, you can check on there. Thank you.

[Octocontrabass]

What does it do instead of writing to the VGA buffer? Triple fault and reboot? Looking at the code, it should triple fault and reboot.

This isn't going to work.

Neither will this.

And while I'm at it, EAX and EBX don't contain the Multiboot2 magic number or pointer to the Multiboot2 information at this point.

[NeonLightions]

What does it do instead of writing to the VGA buffer? Triple fault and reboot? Looking at the code, it should triple fault and reboot.

This isn't going to work.

Neither will this.

And while I'm at it, EAX and EBX don't contain the Multiboot2 magic number or pointer to the Multiboot2 information at this point.

So what should I do to map 2 MiB pages? I followed Philipp's tutorial, but with GAS syntax.

[Octocontrabass]

You should fix your AT&T syntax. You forgot the $ prefix, so the assembler will interpret those labels as memory operands instead of immediate operands.

[NeonLightions]

You should fix your AT&T syntax. You forgot the $ prefix, so the assembler will interpret those labels as memory operands instead of immediate operands.

I have done like what you said. But it still triple fault.

[Octocontrabass]

Maybe you should use a debugger and see if you can spot the problem that way? It'll probably be faster than asking here.

I think you're missing an instruction.

[NeonLightions]

Maybe you should use a debugger and see if you can spot the problem that way? It'll probably be faster than asking here.

I think you're missing an instruction.

How stupid am I? I forgot to copy %eax back to %cr4, thank you! Now it's working normal. Sorry to bother you

[NeonLightions]

Hi,
After I fixed stupid bug (sorry to bother), there's more bug in my project. In kernel/video/vga/vga.c, there's a bug in __clrscr() but I can't find out what. Can anyone help me?

[Octocontrabass]

A typo in this line causes an infinite loop.

[NeonLightions]

A typo in this line causes an infinite loop.

Thanks, another question: I can't write text with color, how may I fix it?