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Gregory Bowne
7d9d0aeee3
This is the implementation for memory.c memory.h pair to house the memset. memcmp, memcpy, memmove etc careful as there are now duplicates in utils implementation
ClassicOS
ClassicOS is a 32-bit Intel x86 operating system built from scratch using C, NASM, and GCC.
Designed for 386, 486, and Pentium-class CPUs, it runs in protected mode, outputs to VGA text mode and serial ports, and supports floppy/HDD boot with basic FAT support.
✨ Features
- MBR bootloader at
0x7C00 - Switch to protected mode with GDT
- A20 gate enabling
- Simple FAT12/FAT16 disk loader stub
- VGA text output (
0xB8000) - Serial COM1 support (
0x3F8) - Basic kernel (
kmain) written in C - Makefile-based build system
- Bootable floppy image for testing in QEMU
⚙️ Requirements
You’ll need the following tools installed:
nasmgcc(targeting i386)ldmakeqemu-system-i386
Optional:
gdbvncviewer(TigerVNC or similar)
🛠️ Building ClassicOS
Clone and build:
git clone https://github.com/gbowne1/ClassicOS.git
cd ClassicOS
make
build kernel for %f in (*.c) do gcc -m32 -O0 -Wall -Wextra -Werror -pedantic -ffreestanding -nostdlib -fno-pic -fno-stack-protector -fno-pie -march=i386 -mtune=i386 -c "%f" -o "%f.o"