Here is my new kernel code that should print a(btw the reason it's called printstack is because I'm trying to pass parameters by stack, but that didn't work):
void printstack(char in){ /*print function*/ asm ("mov ah,0x0e\n""mov al,%0\n""int 0x10\n" ::"r"(in) ); }void main(){ /*kernel entry point*/ printstack('a');}However when I test it in QEMU, it only print spaces.
Here is the full script that build os.flp:
echo ">>> Creating floppy image..." mkdosfs -C os.flp 1440 || exit echo ">>> Assembling bootloader..." nasm -O0 -w+orphan-labels -f bin -o source/bootload/bootload.bin source/bootload/bootload.asm || exit echo "compiling kernel" gcc -c ./source/kernel.c -masm=intel ld --oformat binary kernel.o -o ./source/kernel.bin -e main echo ">>> Adding bootloader to floppy image..." dd status=noxfer conv=notrunc if=source/bootload/bootload.bin of=os.flp || exit echo ">>> Copying kernel" rm -rf tmp-loop mkdir tmp-loop && mount -o loop -t vfat os.flp tmp-loop && cp source/kernel.bin tmp-loop/ sleep 0.2 echo ">>> Unmounting loopback floppy..." umount tmp-loop || exit rm -rf tmp-loopt echo '>>> Done!'