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Questions tagged [osdev]

Operating System development: kernel, shell, networking, cross-compiling, etc.

An operating system is the base software that runs atop computers. It has at least two important roles:

  • it manages access to the underlying hardware, regulating competing access to the same resources from multiple programs;
  • it presents an extended machine for programs that is easy to understand and use.

Operating system development comprises several topics, like:

  • kernel;
  • supporting operating system utilities (e.g. the shell, networking, etc.);
  • cross compiling.

Resources

This community wiki contains links to several interesting resources and courses to get started on operating system development:

What are some resources for getting started in operating system development?

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ld: cannot perform PE operations on non PE output file 'Kernel.bin' (MinGW)

I looked for a solution to this a lot, but I didn't find anything helpful. I'm making an OS with assembly and added C++ code. I made a file that links everything named "compileasm.bat": nasm bootloader.asm -f bin -o bootloader.bin nasm…
alex12
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How can I check xcr0 register in QEMU session gdb?

I want to check the register value of my QEMU session in gdb. Currently, I cannot use qemu monitor due to I use -nographic. (I know there is option such as -mon :serial but currently I cannot enter to the qemu monitor with some other unknown…
JHAhn
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NASM: Invalid effective address in Real Mode

I am trying to draw to screen in Real Mode, so I am trying to access 0xB8000 using segmentation My assembly code is this [BITS 16] org 0x7c00 begin: mov ah, 0x01 ; disable cursor mov ch, 0x3f int 0x10 mov ch, 0x0000 mov cs, 0xb800 mov…
frogstair
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Unable to pass arguments and recieve them assembly. OSDEV

I am trying to write my own OS, I currently am trying to pass the video framebuffer address to my kernel so that I can start plotting pixels and etc. However, when I try and pass my arguments to my kernel entry the argument doesn't get passed. I…
Özgür Güzeldereli
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Cache configuration for DMA device access on ARM Cortex-A72

I am writing an operating system for the raspberry pi. I have a problem with the sdcard driver for the custom sdhost controller (emmc2) of the raspberry-pi 4 (Cortex-A72, ARMv8-A, bcm2711 chipset). Without using sdma everything works. With sdma,…
ErwinP
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what is wrong in this assembly function to make idt entries?

i was writing a simple bootloader in assembly and testing it on qemu. i needed an idt and wrote a function to make entries. idk what is wrong here- please check- makeidt: ;privilage level in cl ;index to a gdt entry in ax ;handler function pointer…
Sasidhar
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How to go from an assembler real mode source code to a bootable flash drive and optical disc?

I'm learning Operating System programming and I would like to try my programs/codes on a physical machine instead of virtual ones. I tried the simplest real mode program (show below): jmp $ ; will loop forever times 510-($-$$) db 0 ; padding dw…
Paiku Han
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Adding kernel image to bios binary

So years back my high school computer science teacher was going on about that games from the early days could "now" be fitted on a bios chip. Later decided to study engineering thanks to that guy. A bunch of years passed, bios flash chips got bigger…
meME
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OS X, gcc, x86, segmentation, paging, seg fault, bus error

In the case of osx, gcc, modern x86: How is the x86 segmentation h/w and paging h/w used?
grok12
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How do I install x86_64-elf-ld on ubuntu 20.04?

I am trying to write an OS kernel and I need a certain dependency for compiling the assembly to an iso binary. The dependency is x86_64-elf-ld. I cannot find any resources for installing it on ubuntu online so I thought I would ask the internet.
Lambda Banquo
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why booting APs needs an indirect call in the mit6.828 example OS kernel?

I'm studying mit6.828 course, I don't understand why it must indirect call when booting APs in lab4. I try to direct call call mp_main(source code: movl $mp_main, %eax; call *%eax), but it causes triple fault. Here is part of the source…
snow rw
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Why after enable paging specific address is not available?

I just want to fully understand how paging works on practice. part of my code for paging: .section .bss .align 4096 p4_table: .skip 4096 p3_table: .skip 4096 p2_table: .skip 4096 and more code: set_up_page_tables: movl $p3_table,…
JustOneMan
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Arm64 - Absolute branching generating exception

Jumping to a C function using its absolute address (0x80904) in 64arm with BLR fails: LDR x3, =0x80904 SUB x0, x3, x19 BL print_x0 // Prints something to uart, i.e, x0 == x19 BLR x19 // Fails! The address is good: BLR x3 works. x19 value is not…
A F
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I want to compile my code to 32 bit systems and have the following make file, how do I make it right?

So, I got this Makefile from a git repository and it compiles the source code that came with this correctly. The project is for an Operating System from scratch. This Makefile is for a 64-bit OS tutorial. I'm currently learning about 32-bit…
iwrestledthebeartwice
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Print the contents of the CR0 register

I am making my own bootloader which switchs to protected mode(32-bits) and then prints the contents of the CR0 register (the one used to turn on protected mode). I need to write the program on assembly. mov esi,hello mov ebx,0xb8000 .loop: …
Elliot Alderson
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