README

Features

• Long Mode (64-bit) OS
• Higher Half Kernel
• Stack Based - Page Frame Allocator (PMM) with O(1) time complexity
• Virtual Memory Manager (VMM)
• Global Descriptor Table (GDT)
• Formatted Printing Support (Printf(...))
• Fonts are rendered to a Framebuffer
• Interrupt Descriptor Table (25/01/22 1:28 AM Indian Standard Time)
• Keyboard Input (28/01/22 10:40 PM Indian Standard Time)
• Heap
• Threading
• File System

More coming soon...

Here is the current # of lines of code. I hope this keeps on increasing :-D

Language	Files	Blank	Comment	Code
C++	20	448	884	1474
C/C++ Header	23	440	789	832
CMake	1	8	10	20
SUM	44	894	1683	2326

Build Instructions

To install build this kernel for the first time, take the following steps :

• Clone the repo
• Run git submodule update --init (or clone recursively in first step itself)
• Uncomment the line make -C limine from `build.sh``
• run build.sh
• Comment out the make -C limine line again (keep this commented for future)

Run MisraOS

To run MisraOS, you run the misra.hdd file present in the project root directory. This is built when you run the build script. Run it using qemu-system_x86-64 misra.hdd -m 256. This will run it with 256 MB of memory.

License

BSD 3-Clause License

Copyright (c) 2022, Siddharth Mishra All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Attribution

If you use code from this repo, I'd love to see the author of code attributed somewhere where you are using it (the code) 🙃 😍 😌 😙