summaryrefslogtreecommitdiff
path: root/sos-code-article3/extra/Makefile
diff options
context:
space:
mode:
Diffstat (limited to 'sos-code-article3/extra/Makefile')
-rw-r--r--sos-code-article3/extra/Makefile40
1 files changed, 40 insertions, 0 deletions
diff --git a/sos-code-article3/extra/Makefile b/sos-code-article3/extra/Makefile
new file mode 100644
index 0000000..f858aa6
--- /dev/null
+++ b/sos-code-article3/extra/Makefile
@@ -0,0 +1,40 @@
+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