sbutz / burritos

burritos

An i386 kernel. Built for self educational purposes (to compensate for the disappointing operating system course at OTH).

Build Requirements

• make
• gcc
• xorriso
• grub-mkrescue
• qemu (for running)

Features

• VGA output
• Interrupts
• Charwise serial i/o
• Task switching
• Usermode
• Paging

TODO

• Programs as mutliboot modules
• Higher half kernel (for vm86 mode)
• Register irqs in modules
• Implement assert
• Implement kmalloc
• Implement memory allocation syscall
• Implement userspace heap
• Basic shell: read input, react to input
• Better kprintf implementation
• Test: successful boot, userspace has no privileges, memory virtualization
• Test: Boot-Test
• Test: Syscall while interrupt? Prevent Timer Interrupt with Syscall?
• Test: Memory access of user process (kernel mem, other task mem)
• Test: Mutliboot-Compliance (gnu mbchk)
• Test: Posix-Compliance

Debugging

Qemu Monitor:

telnet localhost 55555