Simple bootloader for x86 machines. Loads kernels from the boot disk set by the
BIOS to the 0x1000 address, switches to 32 bit protected mode and transfers
control to the kernel.
A dumb kernel is included for testing.
You'll need the Netwide Assembler (NASM) and the GNU C toolchain (GCC, LD and
Make) to build. Also, your system needs a cat implementation in the $PATH.
Use make to create everything: the bootloader and the dumb kernel, with both
linked in the os_image32.img or os_image64.img file. The bios_x86 or
bios_x86_64 file is just the MBR boot sector (i.e., the bootloader itself) and
the kernel32 or kernel64 is just the compiled kernel.
The script boot.sh launches the image in a QEMU-KVM virtual machine.
- Change to a more portable/generic assembler syntax.
- Support to x86_64 and UEFI.
- Slightly more sofisticated kernel that does not overwrite the bootloader messages.