Tutorial 5: Error when executing 'asm("sti");'

[algorithman-de]

Tutorial 5: Error when executing 'asm("sti");'

[jj01101010]

But i have to say your tutorial series is GREAT pls never leave this project

[sgermain06]

Hey, I have the same problem. If I comment out the sti call, it doesn't crash, but if I don't, as soon as it calls it, VirtualBox crashes. Were you ever able to fix this? Anyone can help?

[sgermain06]

Ah! I found out what was happening. In my gdt constructor, I had inverted the indexes of the array I sent to the lgdt command. After I switched those around, it stopped crashing. Now, I have another problem though. When I call sti, not only I don't receive any interrupt calls to my HandleInterrupt function, but after like 5-10 seconds, my screens clear and fills with some weird characters. I'm trying to compare my code with the code in this git repository and, so far, I seem to be matching. I'm sure I'm missing something stupid...

[sgermain06]

Yeah, I found what I did. In the interrupts.cpp, I set the handlerAddressLowBits twice instead of setting the handlerAddressLowBits and handlerAddressHighBits. Everything is working fine now.

[fluecs]

Same issue. Can't seem to fix it.

[M1sterPl0w]

@HayJayDee @Ilc-Ilia-Developer Is it possible to show your code? Maybe I can take a look.

[StjepanBM1]

Does anyone know how to fix this issue?

[ssagar-linux]

I resolved following issue via:-
-GlobalDescriptorTable::SegmentDescriptor::SegmentDescriptor(uint32_t limit, uint32_t base , uint8_t type)
+GlobalDescriptorTable::SegmentDescriptor::SegmentDescriptor(uint32_t base, uint32_t limit, uint8_t type)

mistakenly using base & limit interchangeably

[yutojama]

1. check out constructor of GlobalDescriptorTable(), make sure i[0] = sizeof(GlobalDescriptorTable) << 16; i[1] = (uint32_t) i[2];
2. check all structs with attribute((packed)), make sure everything is placed just in the order as tutorial and nothing is randomly swapped. For me, I changed sequence of size and base in InterruptDescriptorTablePointer and that led to error.