davxy / beeos

A simple "Unix-like" kernel trying to be POSIX compliant

BeeOS

A simple and minimal "Unix-like" kernel trying to be POSIX compliant.

The kernel is NOT STABLE and is a discontinuous work mainly used as a didactical tool for operating systems and low level programming.

Because of it's simplicity it can be used as a trampoline to start digging with common operating system problems. Once you've mastered the BeeOS sources it will be a lot easier to start hacking with more complex OS projects.

Building

Prerequisites

• gcc
• binutils
• make
• qemu (qemu-system)

Quickstart

1. make all

   This command will build the kernel, standard library (libc), user utility library (libu) and user applications.

2. (cd misc && sudo ./mkfs.sh)

   Creates the root filesystem ramdisk with the user applications.

3. (cd misc && ./qemu.sh)

   Starts qemu and BeeOS.

Implemented Milestones

Supported Architectures

• x86

Core

• Multitasking
• Syscalls
• Virtual Memory
• Virtual File System: ext2, devfs
• SLAB allocator
• Buddy allocator
• Timer queues

IPC

• Signals
• Pipes

Synchronization

• Spinlocks
• Wait queues

Drivers

• TTY
• Screen
• Ramdisk
• Keyboard
• PRNG

Other

• Multi TTY console

Contributions

All contributions to the project will be listed in the AUTHORS file.

Licensing

BeeOS is free software. See the file COPYING for licensing conditions.

Content

• ChangeLog: Version history
• COPYING: Distribution and modification conditions and terms.
• kernel/: BeeOS kernel sources.
• libc/: BeeOS standard C library.
• libu/: Common userland functions.
• user/: Various user applications and test programs.

beeos's Issues

Question: Where you take user apps?

This is your own user apps or you took it from someone?

Memory limit

with more than 466mb of memory beeos crashes at startup

This problem occurs when I jump the memory size to 2G or more, and cannot start

This problem occurs when I jump the memory size to 2G or more, and cannot start

Error adding high mem zone

Why not build a community in this project?

I think this project is very good. At least it is a lightweight kernel, which is very conducive to learning and research. Why doesn't the author plan to set up an open source community for this project?

*** kernel panic: init exiting

I have tried building this kernel on a few different machines but seem to have an issue getting a build to run in QEMU.

I didn't make any changes to the source code, and simply ran the following commands:
make all && (cd misc; sudo ./mkfs.sh; ./qemu.sh)

From some preliminary println debugging, it seems that the execve syscall is throwing an error, since named(path) ends up being NULL. This is due to !S_ISDIR(dent->inod->mode) in named() returning false on the first iteration.

I am testing on a very clean version of Ubuntu 20.04.2 LTS.

I would love if you could give some insight as to why the first build might not be succeeding. I have attached the disk.img file below.

Thanks!

disk.zip

Could BeeOS fit on a floppy?

Good day @davxy ! Please tell, could BeeOS fit inside a floppy? Even today the floppies are still being used, for example - as virtual floppies inside the coreboot open source BIOS. Just imagine: your wonderful OS could be a part of someone's BIOS build! (for coreboot supported motherboard, maybe you have or could get one - see https://www.coreboot.org/Supported_Motherboards ) It seems that BeeOS size is less than 1.44MB, but I would like to make sure

BUILD FAILED

@davxy
@Mcpg
@informer2016
@malbx
@game-lover
linker could not found -lgcc flag.