osdev

"It works on my machine" _{(No actually, everything I upload here has been tested on my vm and it works, so i wont be reading yalls issues unless its a feature request)}

Features & TODOs

• GDT/IDT ✅
• PIT timer ✅
• Paging ✅
• Kernel heap memory allocator ✅
• ACPI table parsing ✅
• VESA mode (using LFB provided by grub) ✅
• Text rendering with custom font support (using ssfn.h) ✅
• Simple ATA driver with sector I/O ✅
• Custom block based filesystem (skbd-fs) ✅
• Keyboard and mouse drivers ❌
• Usermode and system calls ❌
• Userspace memory allocator ❌
• Multitasking and ELF loader ❌
• GUI and userspace utility programs ❌

Notes

• The LFB is originally placed at 0xFD000000 and is mapped at VA = 0xD0000000, mapping it with PA = VA causes issues which I may resolve in the future.
• The PIT timer is inaccurate, an IRQ is fired every 0.999847 ms, resulting in a 153 ns error every second. (i.e. calling pit_sleep(10000) will finish 1530 ns earlier)
• The ATA driver is currently implemented using programmed I/O which is significantly slower than direct memory access (DMA).
• Notes related to the filesystem

Third party software

While this operating system uses its own native tools, in also relies on Scalable Screen Font 2.0 for font rendering.