christoph/lecture-operating-system-development
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Christoph Urlacher
2022-07-24 23:19:22 +02:00
parent d04f4495ae
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README.md
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@ -1,9 +1,12 @@
Important
======================================
- This does not run in the latest "vanilla" C++ VM image, g++-multilib has to be installed extra
Makefile Makefile
====================================== ======================================
- Added the -std=c++17 flag to enable better constexpr support. - Added the -std=c++17 flag to enable better constexpr support.
- Removed optimizations as the system would crash with them. - Removed optimizations as the system would crash with them.
The BlueScreen would show an empty callstack on crashes with -O2, so I guess the problem is the missing ebp or something like that. The BlueScreen would show an empty callstack on crashes with -O2, so I guess the problem is the missing ebp or something like that.
- Added qemu-stdio target for easy access to the serial output
Changes Changes
====================================== ======================================
@ -29,6 +32,7 @@ Additions
- Basic unique_ptr - Basic unique_ptr
- Basic fixed size array (just a wrapper for C-style arrays) - Basic fixed size array (just a wrapper for C-style arrays)
- Basic dynamic string (heap allocated) - Basic dynamic string (heap allocated)
- Basic span
Bugs Bugs
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@ -37,9 +41,14 @@ Bugs
- The PreemptiveThreadDemo LoopThreads can't be exited, the demo can't be launched multiple times - The PreemptiveThreadDemo LoopThreads can't be exited, the demo can't be launched multiple times
- Tree Allocator (uses a red black tree to find best-fit blocks) crashes when freelist root is removed - Tree Allocator (uses a red black tree to find best-fit blocks) crashes when freelist root is removed
- Can't restart the OS (bluescreen) - Can't restart the OS (bluescreen)
- Random bluescreens that are hard to pinpoint - Fast keyboard inputs sometimes trigger bluescreens
- Different combinations of demos also trigger bluescreens
- Other seemingly random bluescreens that are hard to pinpoint
Findings Other
====================================== ======================================
- Keyboard repeat rate and led functionality is missing
- Circle functionality in VESA mode is missing
- Singleton can't have a destructor, as C++ doesn't know how to deinitialize them after program exit. - Singleton can't have a destructor, as C++ doesn't know how to deinitialize them after program exit.
This happens because we compile with very limited libraries so "atexit" to register destructors is missing. This happens because we compile with very limited libraries so "atexit" to register destructors is missing.
I wanted to make the device/hardware classes (PCSPK, CPU etc) singleton because it doesn't make sense to have more than one.