Writing & Making Operating System and Kernel parts so simple like Hello World Programs, Starting from writing Bootloaders, Hello World Kernel, GDT, IDT, Terminal, Keyboard/Mouse, Memory Manager, HDD ATA R/W, VGA/VESA Graphics
I've noticed a few bugs in your BIOS32 implementation that I myself had, and later fixed.
For instance - you called sti to enable interrupts, but that will also enable external interrupts which have not been mapped in the IDT/GDT (since they are real mode) and will crash the system if BIOS32 is used in a more high-level environment.
A few other fixes, such as not clobbering a few other registers and flushing the TLB after disabling paging, and here is my result.
Your previous code, while it works, will cause issues if used in a higher-level system, like my OS. I learned and solved these bugs the hard way. Specifically, BIOS32 causes serious issues when combined with virtual memory management.
I have tested the code changes and they pass the tests, and produce the same results as your old code but can be used in higher-level implementations.
I hope this helps! Please let me know if further changes are needed.
Hi,
I've noticed a few bugs in your BIOS32 implementation that I myself had, and later fixed.
For instance - you called
stito enable interrupts, but that will also enable external interrupts which have not been mapped in the IDT/GDT (since they are real mode) and will crash the system if BIOS32 is used in a more high-level environment.A few other fixes, such as not clobbering a few other registers and flushing the TLB after disabling paging, and here is my result.
Your previous code, while it works, will cause issues if used in a higher-level system, like my OS. I learned and solved these bugs the hard way. Specifically, BIOS32 causes serious issues when combined with virtual memory management.
I have tested the code changes and they pass the tests, and produce the same results as your old code but can be used in higher-level implementations.
I hope this helps! Please let me know if further changes are needed.