Add: build process for real hardware

.gitignore

@@ -2,3 +2,6 @@
 bochslog.txt
 build/
 kernel.elf
+os.iso
+blankos.iso
+real/

README.md

@@ -39,6 +39,21 @@ make run
 
 This will start a new Bochs debugger instance. To proceed with the kernel execution, you will have to type `c` in the shell spawning Bochs. Serial output will be saved under the `com1.out` file, this way you can debug the kernel by viewing its log messages. To quit, type `q`. Feel free to open issues or pull requests.
 
+## Running on real hardware
+
+To run the OS on real hardware, you'll first need to have a BIOS-compatible computer. Some of the new laptops with graphical "BIOSes" only support UEFI now. So make sure to get a computer that can boot into BIOS mode, **not UEFI mode**. Then, switch the boot mode to "Legacy" in your BIOS utility.
+
+Then, use the Makefile target `real` to build a "real"-capable ISO disk image. The image will have GRUB2 installed on it, using the `grub-mkrescue` utility (make sure to install it before) which is dependent on `xorriso` (install it too).
+
+Once the ISO file is generated, you can write it on a disk using this command:
+
+```
+sudo dd bs=4M if=blankos.iso of=/dev/sdX status=progress oflag=sync
+```
+
+Replace `sdX` with your USB drive name (you can find it by doing `sudo fdisk -l`).
+Tada! You now have a working BlankOS USB stick. Go ahead and try it out!
+
 ### ⚠️ Disclaimer
 
-This is a hobbyist operating system kernel and it comes without any warranty whatsoever! It isn't capable of anything really.
+This is a hobbyist operating system kernel and it comes without any warranty whatsoever! It isn't capable of anything really. Feedback and contributions are highly appreciated!

makefile

@@ -1,5 +1,5 @@
 CC = gcc
-CFLAGS = -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartfiles -nodefaultlibs -Wall -Wextra -c -I src/
+CFLAGS = -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartfiles -nodefaultlibs -Wall -Wextra -Wno-div-by-zero -c -I src/
 LDFLAGS = -T link.ld -melf_i386
 AS = nasm
 ASFLAGS = -f elf
@@ -43,9 +43,14 @@ os.iso: kernel.elf
 							-o os.iso                       \
 							iso
 
+real: kernel.elf
+	mkdir -p real/boot/grub
+	cp kernel.elf real/boot/kernel.elf
+	grub-mkrescue real -o blankos.iso
+
 run: os.iso
 	bochs -f bochsrc.txt -q 
 
 clean:
-	rm -rf $(OBJ_DIR) kernel.elf os.iso
+	rm -rf $(OBJ_DIR) kernel.elf os.iso blankos.iso real
 

src/kernel/shell.c

@@ -17,7 +17,11 @@ void shell_install()
 
     if (strcmp(input_buffer, "help") == 0)
     {
-        printf("This is the Blank Operating System\ndesigned for fun by xamidev\n\nCommand help:\n\n\thelp - shows this message\n");
+        printf("This is the Blank Operating System\ndesigned for fun by xamidev\n\nCommand help:\n\n\thelp - shows this message\n\tpanic - makes the kernel panic\n");
+    }
+    else if (strcmp(input_buffer, "panic") == 0)
+    {
+	printf("%d", 4/0);
     }
 
   }