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CHANGELOG.md

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NOS (v0.0.1) [was built on top of simple-os]:

  • added kmain()
  • added kernel library libk (<string.h>, <ctype.h>, <stddef.h>, <stdint.h>)
  • added text output to VGA
  • added kprintf() function (%#xXidpusc options of standard C library printf)
  • added to libk <stdarg.h>, <memory.h>, <math.h>
  • added VGA driver
  • added color printing function kprintc() with 16 colors

  • added ksleep() & __ksleep() functions in <kernel.h>
  • modified VGA driver (added new functions: update_cursor(), port_byte_out())
  • added default background and foreground colors in kernel/tty.h
  • added VGA scrolling (__kscroll())

  • added \v \t \r \b special characters support in kputchar()
  • define a signed integer types in <stdint.h>
  • added kvprintf() function
  • added kernel halt khalt() & kernel panic kpanic() for detecting errors
  • added Global Descriptor Table

  • added ports in <ports.h>
  • added TSS (Task State Segment) entry in <gdt.h>
  • added IDT (Interrupt Descriptor Table) in <idt.h>
  • added GNU GRUB support
  • added IRQ (Interrupt Request) in <irq.h>
  • added PIT (Programmable Interval Timer) in <timer.h>
  • added keyboard driver in <keyboard.h>

  • added multiboot information structure in <multiboot.h>
  • added physical memory manager in <pmm.h>
  • added virtual memory manager in <vmm.h>
  • added main memory manager in <mm.h>

  • added kmalloc() & kfree() functions for dynamic memory allocation
  • added option to set default color
  • added keyboard_wait() & keyboard_getchar() functions in keyboadrd.h
  • added kernel shell in ksh.h
  • added simple-os standard functions in sstd.h

NOS (v0.0.2):

  • added help menu to kernel shell
  • separated libc and kernel library
  • modified kernel TTY
  • added CLI themes
  • switched project to new C23 standard
  • added Doxygen documentation for header files

NOS (v0.0.3):

  • moved some inline assembly commands in include/asm/ directory
  • fixed issue with freeing available blocks of memory
  • replaced unistd.h with nosstd.h
  • made preparations for implementing process manager and scheduler
  • made preparations for kernel executable structure
  • added Virtual File System
  • started implementation of ext2 file system
  • added initial ramdisk
  • moved file types & permissions into stat.h
  • added some file handeling functions like open(), close(), etc.
  • added debug option to main makefile (GDB + QEMU)
  • added atoi(), strpbrk() & strtok() functions
  • added cat command (only for reading files) & new themes:

  • added ls command
  • added OS login
  • added tty_printc() and kputchar_c() functions
  • added colored shell prompt

NOS (v0.0.4):

  • added new math functions to libc:
    • fabs() fmin() fmax() acos() atan2() asin() atan() cos()
    • sin() tan() cosh() sinh() tanh() log2() log10() ceil() floor()
  • added tests for math functions
  • added new string handeling functions to libc:
    • strchr() strrchr() strnstr() memmove() memchr()
  • added new general standard library functions to libc:
    • atoi() atof() rand() srand() qsort() system()
  • updated multiboot information structures
  • added kernel memory layout macros
  • disabled virtual memory management
  • added outw() function to <asm/io.h>
  • enabled VBE mode
  • added graphics library for drawing pixels/circles/lines and etc.
  • added VBE font
  • adapted TTY for VBE mode
  • added errno.h & strerror() function
  • renamed some shell commands & add several new: uname, reboot, shutdown
  • separated libc from kernel
  • added enable_paging() macro
  • removed VGA driver
  • moved libc to userspace related directory