Process Overhaul, Memory Tweaks, and Bug Squashing

[Galfurian]

Process Overhaul, Memory Tweaks, and Bug Squashing

1. Process Management Enhancements

• PID Management:
  • Added pid_manager.c for bitmap-based PID handling with initialization, allocation, and deallocation. It's like givin' every process its own shiny teef!
  • Integrated pid_manager_get_free_pid in process.c and replaced old scheduler_getpid logic-no more fighting over IDs.
  • Refactored process_create_init to use dynamic PIDs and improved task initialization, makin' things run smoother than a well-oiled choppa.
  • Integrated pid_manager_mark_free to release PIDs when processes meet their glorious end.

2. Memory Management Improvements

• Buddy System Enhancements (buddy_system.c, zone_allocator.c):
  • Reintroduced the buddy system code-because statically compiled libraries were more stubborn than a grot hoarding squigs.
  • Renamed buddysystem.h to buddy_system.h for consistency.
  • Added stricter validation and diagnostics for memory zone operations-ain't leavin' anything to chance!
• Virtual Memory Enhancements (paging.c):
  • Beefed up error checks for virtual memory operations (create_vm_area, clone_vm_area, etc.). Now even da sneakiest bugs won't get through.
  • Tweaked constants for virtual memory mapping.
• PMMNGR Refactor:
  • Overhauled pmmngr_init, adding a ton of error checks-turns out even memory likes a bit of discipline.
  • Split zone setup into pmmngr_initialize_pages and pmmngr_initialize_page_data. This way the code is re-usable and easier to understand.

3. Synchronization and Waiting

• Wait Queue Refactor (wait.c):
  • Just change the naming for wait queue functions, before it was a mess (e.g., entry instead of wq), more guessin' wot wq means.
  • Introduced stop_wake_function for managing task STOP/CONT states, keepin' things in line.
• Signal Updates (signal.c):
  • Integrated stop_wake_function into stopped_queue handling.
  • Polished up task restoration logic, like givin' a nob a fresh coat of paint.

4. Filesystem and String Handling

• Safer Path Manipulation:
  • Replaced strcpy/strcat with safer strncpy/strncat in rm.c and t_mkdir.c-less risk of buffer overruns!
  • Added __build_path helper for reusable path concatenation in directory operations (t_mkdir.c).
• Filesystem Enhancements:
  • Refactored ext2_write_inode_block for better reliability. EXT2 it's still a slog, but it won't krump itself apart anymore.
  • I don't know if it was in this PR or a previous one, but the way I was using kmem_cache_alloc in EXT2 was completely annihilating the kernel. I found that bug after speed-running a paper for a midnight deadline. Y'know what, what better thing to do after a paper deadline if not a tasty session of midnight-coding-wtf-is-that-thing!-did-I-introduced-that-bug?!?-no-more-beer-for-you-sir.

5. Debugging and Logging

• Improved Logging:
  • Added a log_level parameter to __blkmngr_dump-more control over da noise we make.
• Standardized Debug Messages:
  • Unified debug message formatting across debug.c and paging.c.

6. Error Handling Enhancements

• Stricter Validations:
  • Introduced is_valid_virtual_address helper for safer address checks-no more orky guesswork.
  • Enhanced error handling and logging in memory and process management.
• Standardized Return Paths:
  • Simplified error returns and removed redundant comments, 'cause nobody likes long-winded grot-speak.

7. Bug Fixes

• Memory Safety:
  • Replaced unsafe string operations with bounded alternatives, keepin' da memory in check.
  • Fixed pointer arithmetic and alignment issues in boot.c.
• Formatting Fixes:
  • Corrected format specifiers in t_msgget.c, t_semget.c, and related tests-accuracy matters, even to Orks.

8. Miscellaneous

• Test Enhancements:
  • Updated test programs to check IPC and memory management changes. If da tests ain't happy, neither are we.
  • Polished up test output-lookin' good for da next battle.
• Deprecations and Cleanups:
  • Removed unused macros and legacy variables all over the tests. Dead weight ain't for fightin'!
  • Commented out work-in-progress waitpid code for future tinkerin'.
• Renaming for Consistency:
  • Renamed buddysystem.h to buddy_system.h and fixed include paths-da naming squigs have been tamed.