initial commit, asm operating system with the MikeOS bootloader

build-openbsd.sh

@@ -0,0 +1,80 @@
+#!/bin/sh
+
+# This script assembles the MikeOS bootloader, kernel and programs
+# with NASM, and then creates floppy and CD images (on OpenBSD)
+
+# Only the root user can mount the floppy disk image as a virtual
+# drive (loopback mounting), in order to copy across the files
+
+
+echo "Experimental OpenBSD build script..."
+
+
+if test "`whoami`" != "root" ; then
+	echo "You must be logged in as root to build (for loopback mounting)"
+	echo "Enter 'su' to switch to root"
+	exit
+fi
+
+
+if [ ! -e disk_images/mikeos.flp ]
+then
+	echo ">>> Creating new MikeOS floppy image..."
+	dd if=/dev/zero of=disk_images/mikeos.flp bs=512 count=2880 || exit
+	vnconfig vnd3 disk_images/mikeos.flp && newfs_msdos -f 1440 vnd3c && vnconfig -u vnd3 || exit
+fi
+
+
+echo ">>> Assembling bootloader..."
+
+nasm -O0 -w+orphan-labels -f bin -o source/bootload/bootload.bin source/bootload/bootload.asm || exit
+
+
+echo ">>> Assembling MikeOS kernel..."
+
+cd source
+nasm -O0 -w+orphan-labels -f bin -o kernel.bin kernel.asm || exit
+cd ..
+
+
+echo ">>> Assembling programs..."
+
+cd programs
+
+for i in *.asm
+do
+	nasm -O0 -w+orphan-labels -f bin $i -o `basename $i .asm`.bin || exit
+done
+
+cd ..
+
+
+echo ">>> Adding bootloader to floppy image..."
+
+dd conv=notrunc if=source/bootload/bootload.bin of=disk_images/mikeos.flp || exit
+
+
+echo ">>> Copying MikeOS kernel and programs..."
+
+rm -rf tmp-loop
+vnconfig vnd3 disk_images/mikeos.flp || exit
+
+mkdir tmp-loop && mount -t msdos /dev/vnd3c tmp-loop && cp source/kernel.bin tmp-loop/
+
+cp programs/*.bin programs/*.bas programs/sample.pcx programs/vedithlp.txt programs/gen.4th programs/hello.512 tmp-loop
+
+echo ">>> Unmounting loopback floppy..."
+
+umount tmp-loop || exit
+
+vnconfig -u vnd3 || exit
+rm -rf tmp-loop
+
+
+echo ">>> Creating CD-ROM ISO image..."
+
+rm -f disk_images/mikeos.iso
+mkisofs -quiet -V 'MIKEOS' -r -J -o disk_images/mikeos.iso -b mikeos.flp disk_images/ || exit
+
+echo '>>> Done!'
+