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• Memory map: which memory is usable?
• Do bitmap allocator

Following the limine-barebones roadmap.

• Load an IDT
• #2
• Write a virtual memory manager that can map, remap and unmap pages.
• Begin parsing ACPI tables, the most important one is the MADT since it contains information about the APIC.
• Start up the other CPUs. Limine provides a facility to make this less painful.
• Set up an interrupt controller such as the APIC.
• Configure a timer such as the Local APIC timer, the PIT, or the HPET.
• Implement a scheduler to schedule threads in order make multitasking possible.
• Design a virtual file system (VFS) and implement it. The traditional UNIX VFS works and saves headaches when porting software, but you can make your own thing too.
• Implement a simple virtual file system like a memory-only tmpfs to avoid crippling the design of your VFS too much while implementing it alongside real storage filesystems.
• Decide how to abstract devices. UNIX likes usually go for a /dev virtual filesystem containing device nodes and use ioctl() alongside standard FS calls to do operations on them.
• Get a userland going by loading executables from your VFS and running them in ring 3. Set up a way to perform system calls.
• Write a PCI driver.
• Add support for a storage medium, the easiest and most common ones are AHCI and NVMe.