ahmedredaooooo / operating-system-fos

The project consists of three milestones: Milestone 1 integrates command prompt, system calls, and dynamic allocation; Milestone 2 addresses kernel and user heaps, implementing a memory fault handler; Milestone 3 introduces advanced fault handling and a CPU scheduler.

FCIS Operating System

A fully functioning operating system written in C, achieving three significant milestones:

• Milestone 1: Integrated command prompt, system calls, and dynamic memory allocation to establish a foundational system framework.

• Milestone 2: Implemented kernel and user heaps, along with a memory fault handler, ensuring efficient memory management and system stability.

• Milestone 3: Introduced advanced fault handling mechanisms and a CPU scheduler, optimizing system performance and responsiveness.

Creators

• Ahmed Galal
• Ahmed Ayman
• Ahmed Reda
• Abdelrahman Warraky

operating-system-fos's Issues

User Heap #16: free_user_mem()

#3: Syscalls

#4: Params Validation

#1: str2lower

Convert all alphabet chars of a given string src to lower case, store it in dst and return it

BONUS: Allocate by Best Fit

#7: Schedule Next Env

#7: Free

Fault Handler I #7: env_page_ws_list_create_element()

Kernel Heap #2: sbrk()

#8: Timer Tick Handler

Kernel Heap #3: kmalloc()

User Heap #14: allocate_user_mem()

User Heap BONUS#2: O(1) of free_user_mem

Kernel Heap #6: kheap_virtual_address()

#6: Allocate by First Fit

#1: FIFO Re/placement

Kernel Heap BONUS#1: krealloc()

check the picture taken on 21/11/2023 for handling the cases

Fault Handler I #8: Check Invalid Pointers

#4: new SysCall to Set Nice Value

User Heap #11: new SysCall to Get Hard Limit

User Heap #12: sys_sbrk()

Kernel Heap #1: KH Block Alloc Initialization

L1
There is no direct tests for this function, But we test it while testing other functions that test it

User Heap #10: UH Block Alloc Initialization

User Heap #15: free()

#9: Complete Test of Realloc

User Heap #13: malloc()

#8: Reallocate by First Fit

#2, #3: LRU Re/placement

Kernel Heap #5: kheap_physical_address()

Fault Handler I #9: Placement

#5: Initialize

Overall Testing

Kernel Heap #4: kfree()

#4: Params Validation

#6: Initialize Scheduler

#5: Getters & Setters

#2: process_command

#2 process_command

</table>

Status	Return	Content of List
1) invalid command (i.e. command chars are not exist/matched with any other command)	CMD_INVALID	Empty
2) command is found BUT with an invalid number of arguments	CMD_INV_NUM_ARGS	Found command
3) command is not found BUT its chars are subsequence-matched with one or more commands	CMD_MATCHED	All matched commands
4) command is found with correct number of arguments	Index of the found command in “commands“ array	Empty