exscapeOS/CHECKLIST at master · exscape/exscapeOS · GitHub

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[x] Screen output (vsprintf)
[x] GDTs set up
[x] IDTs set up
[x] ISRs/IRQ handling
[x] PIT support
[x] Paging
[x] Keyboard input
[x] Kernel heap
[x] VFS layer + basic initrd
[x] Proper console support (not sure how "proper" it is, but... it's decent!)
[x] Multitasking
	[x] Basic kernel mode multitasking (shared page directory)
	[x] User mode support
[x] Syscalls
[-] ATA driver
	[x] Basic reading (PIO)
	[x] Basic writing (PIO)
	[ ] Decent error handling
[-] File system
	[-] FAT
		[x] Read support
		[ ] Write support
	[-] ext2
		[-] Read support
		[ ] Write support
[x] Executable loading (ELF parsing, etc.)
[x] User-mode libc (wohoo!)
[x] fork + execve
[x] User-mode shell
[x] Pipes
[X] FPU/SSE/AVX state saving during context switches
[ ] SSE/2/3/4.x/AVX support
[ ] Signals