1 files changed, 40 insertions, 0 deletions

diff --git a/sos-code-article3/extra/Makefile b/sos-code-article3/extra/Makefile
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+++ b/sos-code-article3/extra/Makefile
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+OBJCOPY=objcopy
+
+all: sos_qemu.img
+
+-include ../.mkvars
+
+# The image is the simple concatenation of the boot sector and the kernel
+# It may be use in bochs or on a real floppy, but NOT in qemu (see below)
+sos_bsect.img: bsect.bin sos.bin
+	cat $^ > $@
+	@echo "You can use the $@ image in bochs or on a real floppy (NOT qemu)"
+
+# For qemu, the trick is to tell it we have *more* than 1440 sectors (720kB).
+# Rtherwise the qemu disk geometry will be configured to be that of a 720kB
+# floppy, while our boot sector assumes it to be 1.44MB
+sos_qemu.img: sos_bsect.img
+	# Padding with 0s after the bsect/kernel image
+	cat $< /dev/zero | dd of=$@ bs=1k count=1440
+	@echo "You can use the $@ image in qemu, bochs, or on a real floppy"
+
+# we extract the boot sector from the main ELF binary
+bsect.bin: sos_bsect.elf
+	$(OBJCOPY) -v -O binary -j .bootsect $< $@
+
+# we extract the kernel code from the main ELF binary
+sos.bin: sos_bsect.elf
+	$(OBJCOPY) -v -O binary -R .bootsect $< $@
+
+# The main ELF binary contains the boot sector and the kernel code
+# linked together (hence we deal with a SINGLE image that we split
+# above) because they share some symbol definitions
+sos_bsect.elf: bootsect.o compile_kernel
+	$(LD) --warn-common -T ./sos_bsect.lds -o $@ \
+		bootsect.o $(wildcard ../hwcore/*.o ../drivers/*.o ../sos/*.o)
+
+compile_kernel:
+	$(MAKE) -C ..
+
+clean:
+	$(RM) *.img *.elf *.bin *~ *.o *.out