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My understanding is i386 has segment registers with 16bit like CS it can point to code_descriptor in the GDT that should be in the RAM, to be able to reach to it we need 32bit address : How can CS ...
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69 views

I am trying to setup GDT/IDT/Paging. Below code is what i do, global start global CODE_SEG global isr_asm global DATA_SEG global loadGDT global isr_wrapper extern main extern isr section .text bits ...
Hari's user avatar
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Here's the code for resetting the segments: global reloadSegments section .text reloadSegments: ; Reload the CS register with an offset of 0x08 jmp 0x08:.reload_CS .reload_CS: ...
1 vote
1 answer
308 views

I want to enable GDT in x86_64 OS. I have written following codes to enable the GDT. struct gdt_entry {// 128 Bit uint16_t limit_low; // Lower 16 bits of the segment limit uint16_t ...
2 votes
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170 views

I want to enable GDT in x86_64 OS by init_gdt() function in kernel.c Where, gdt_entry_t is looks struct gdt_entry_struct {// 128 Bit uint64_t limit_low :16; // limit = 16+4 = 20 ...
baponkar's user avatar
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1 answer
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I have set 32 bit protected mode and try to load Global Descriptor table(GDT) by C and assembly and try to print the different registers value by check_gdt() function where void check_gdt() { ...
baponkar's user avatar
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I have a simplistic bootloader comprised of two parts - the actual bootloader that loads the second 'stage' into memory, and executes it. In that second stage, I'm trying to switch to 32-bit protected ...
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138 views

My OS is triple faulting when I load my GDT. I am following these two articles from the osdev wiki: https://wiki.osdev.org/Global_Descriptor_Table https://wiki.osdev.org/GDT_Tutorial When I load my ...
2 votes
1 answer
176 views

I have hobby OS and I want it to jump to 64 bit long mode, everything work fine before far jump to 64 long mode entry, paging works correctly, but QEMU log file shows that EFER values is LMA Triple ...
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206 views

I don’t understand the reason behind using different GDT for each CPU in multiprocessor systems (in linux). The TSS descriptor needs to be unique for each CPU, but we could create a descriptor per CPU ...
giladk's user avatar
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212 views

Once in long mode, is there a straightforward way of loading a new GDT without immediately causing a general protection fault? The issue is that as soon as the new GDT is loaded with lgdt, it seems ...
1 vote
0 answers
177 views

I'm creating a hobby x86_32 bit kernel using C, and simulating it with qemu-system. After creating a VGA driver, I implemented a GDT successfully (or did I?), after setting up internal and external ...
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1 answer
274 views

I am writing an x86_32 bit kernel from scratch in C, after writing a VGA driver, I have been trying to implement the GDT as well as the interrupts for a keyboard driver. However, my GDT_flush() ...
1 vote
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305 views

I am building a simple OS in c++ to learn about the topic. I am using the limine bootloader (Limine 6.20231210.0, as stated by the bootloader version request). One of the first things i am doing in ...
Beaver's user avatar
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I started creating an os entirely in assembly thinking I wanted to do it completely in real-mode, but as soon as I realized the limitations I had, I decided to create the bootloader in real-mode and ...

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