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Update README.md
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‎README.md

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@@ -55,3 +55,57 @@ we have the splash window when the kernel boots(grub draws it):
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When the kernel is fully ready, the `default console` (which you can navigate to by `Alt+F1`) is displayed, there are other 6 consoles initiated by [`/usr/bin/userland_init`](https://github.com/chillancezen/ZeldaOS/blob/master/application/userland_init/etc/userland.init), you can switch the console by `Alt+F2 ... Alt+F7`, you will observe console as below:
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![image_of_console0](https://raw.githubusercontent.com/chillancezen/misc/master/image/zelda_os_console0.png)
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### Feature inventory
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##### Archeticture Features:
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- [X] x86
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- [X] PIC, APIC will be supported in ZeldaOS.x86_64.
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- [X] interrupt management.
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- [ ] x86_64 will support in [ZeldaOS.x86_64](https://github.com/chillancezen/ZeldaOS.x86_64).
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- [ ] Symmetric multiprocessing (SMP).
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##### memory Features:
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- [X] physical memory management.
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- [X] 4K paging(No 3G barrier break) for both kernel and PL3 tasks.
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- [X] Virtual Memory Area(VMA) management(per-task VMAs and kernel VMAs).
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- [X] paging fault handling, including page non-presence and page permission fault.
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- [X] kernel memory allocator.
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##### Kernel Features:
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- [X] multitasking (PL0 tasks and PL3 tasks).
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- [X] task signal framework.
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- [X] Elf32 executable loading.
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- [X] task exception detection(e.g. illegal instruction, #GP, paging permission violation).
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- [X] Elf32 executable loading.
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- [X] Wait queue.
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- [X] Timer.
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- [ ] bottom half schedule.
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- [X] kernel panic.
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- [X] various logging options.
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##### Filesystem Features:
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- [X] Virtual File System (VFS).
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- [X] `zeldafs` as initramfs in Linux.
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- [X] `memfs` as tmpfs in Linux.
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- [X] `devfs` to expose kernel runtime data to userland.
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##### Network Features:
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- [X] net packets management.
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- [X] Ethernet device interface.
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- [ ] L2 multi-bridging(VLAN+MAC learning).
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- [ ] L3 multi-routing(ARP, ICMP).
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- [ ] overlay support(vxlan).
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- [ ] userland networking extension(LWIP).
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##### Device Features:
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- [X] Legacy virtio-net ethernet device driver(with revisionid == 0).
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- [ ] vmxnet3 ethernet device support.
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- [X] PS/2 keyboard management.
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- [X] Programmable Interval Timer(PIT) management.
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- [X] serial port input/output management and `serial console`.
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- [x] ~~ATA/IDE drive management~~.
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- [x] Lower level Text mode video buffer management.
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- [x] `pseudo terminal console` management.
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##### Miscellaneous Features:
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- [X] ZeldaOS [runtime](https://github.com/chillancezen/ZeldaOS/tree/master/runtime).
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- [X] `newlib` libc and libm port
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- [ ] dynamic programming language support
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- [X] [`system call list`](https://github.com/chillancezen/ZeldaOS/blob/master/runtime/syscall_inventory0.c)
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- [X] [`signal list`](https://github.com/chillancezen/ZeldaOS/blob/master/kernel/include/zelda_posix.h)
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- [X] multiple [Applications](https://github.com/chillancezen/ZeldaOS/tree/master/application) running at Privilege Level 3

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