oh-my-os

This is just a simple operating system for learning.

compile

To compile oh-my-os, basic compile tools need be installed, such as gcc and make. The whole thing can be compiled with make -j4 .

dependency

All linux platform on x86 are supported, the following tools are needed

• qemu-system-i386
• gcc

run

run with graphic:

./run.sh

run with nographic

./run_nographic.sh

loading...
~/oh-my-os <main*> # ls
sys proc bin
~/oh-my-os <main*> # cd sys
~/oh-my-os <main*> # ls
vma free_vma kmalloc-early kmalloc free_pages gpu_dump
~/oh-my-os <main*> # cat vma
free <0x00001000, 0xc0000000>

~/oh-my-os <main*> # cat kmalloc
max_size:1024
max_order:7
size:8 slabs_full:0 slabs_partial:1 1
size:16 slabs_full:0 slabs_partial:1 5
size:32 slabs_full:0 slabs_partial:1 21
size:256 slabs_full:0 slabs_partial:1 1

~/oh-my-os <main*> # dmesg
[0.0	][debug     ][info ] debug init success
[0.0	][memory    ][info ] BIOS-provided physical RAM map:
[0.0	][memory    ][info ] BIOS-e820: [System RAM 	<0x00000000, 0x0009fbff>]
[0.0	][memory    ][info ] BIOS-e820: [Reserved 	<0x0009fc00, 0x0009ffff>]
[0.0	][memory    ][info ] BIOS-e820: [Reserved 	<0x000f0000, 0x000fffff>]
[0.0	][memory    ][info ] BIOS-e820: [System RAM 	<0x00100000, 0x7ffdffff>]
[0.0	][memory    ][info ] BIOS-e820: [Reserved 	<0x7ffe0000, 0x7fffffff>]
[0.0	][memory    ][info ] BIOS-e820: [Reserved 	<0xfffc0000, 0xffffffff>]
[0.0	][memory    ][info ] physical memory frame number ranges:
[0.0	][memory    ][info ] kernel:	<0x00000000, 0x00002160>
[0.0	][memory    ][info ] linear:	<0x00002160, 0x00038000>
[0.0	][memory    ][info ] highmem:	<0x00038000, 0x0007ffe0>
[0.0	][page      ][info ] add free pages, pfn:<0x00002160, 0x00038000>, linear mem
[0.0	][page      ][debug] start end:<0x00002160, 0x00038000>, split start end:<0x00002400, 0x00038000>
[0.0	][page      ][info ] add free pages, pfn:<0x00038000, 0x0007ffe0>, high mem
[0.0	][page      ][debug] start end:<0x00038000, 0x0007ffe0>, split start end:<0x00038000, 0x0007fc00>
[0.0	][page table][debug] map: <0xc0000000->0x00000000> size:0x38000000
[0.0	][memory    ][info ] memory init success
[0.0	][PIC       ][info ] pic init finished
[0.0	][irq       ][info ] idt init success
[0.0	][irq       ][info ] register handler for irq 32
[0.0	][timer     ][info ] init timer success
[0.0	][irq       ][info ] register handler for irq 33
[0.0	][init      ][info ] kernel init success!
[0.0	][gpu       ][info ] screen:1024x768, pixel bits:24, vram:0xfd000000
[0.0	][page table][debug] map: <0xfd000000->0xfd000000> size:0x00240000
[0.1	][graphic   ][info ] init graphic success
~/oh-my-os <main*> #

arch

• real mode to protect mode.
• print info to stdio through serial port

memory management

• add buddy allogrithm to allocate/free pages
• kmalloc early: use buddy algorithm to allocate reserved memory
• kmalloc: use slab algorithm to split page and manage small buffer

interrupt

• i8259 interrupt handler
• support keyboard and timer
• support hardware error detect, for example page fault

schedule

• support thread create and schedule

virtual file system

• add virtual file system
• sysfs: support dump kernel info, for example the memory info
• procfs: support dump thread info
• binfs: support virtual program

graphic

• set vbe display mode, show grid.