- Update devlog
- Improve switch_to into embedded assemble language

- Update devlog
- Add SWITCH_TO macro that will be used in the future
- Working on bugs

- Fix bug in task and sched
- Add `print_stack(size_t)` at debug.c. This function can output the
data in current stack.

- Task and sched have been preliminarily completed
    Without arguments and no IOPL switch

- Sched runs successfully, but stil problems

- Bugs on sched

- Fix bug that slab:alloc used be skip init block

Heap

- Slab almost there, I think it can be optimized

- Working on slab:alloc
- Fix bug at vmm.c:map()

Mem dev

Mem dev

- ff->free almost there

- Fix bug at fitstfit.c

- Extend initialize virtual memory to 8MB
- fitstfit algorithm for the kernel initialization phase almost there

    Add ff, buddy and slob files, and I have a problem with ff algorithm

- Update devlog
- Change STACK_SIZE into 16KB
- Add e820.h for physical memory managemant

- Stop dev on task, because there are many bugs in memory management
- Remove unused codes