# Mein common.mk fuer PASST im WS19

EMU ?= kvm
DEBBASE = http://ftp.fau.de/debian/dists/buster/main/installer-amd64/current/images/netboot/debian-installer/amd64/
DISK = passt.img
KVMOPTS = -m 1024 -nodefaults -nographic -display none -echr 0x01 -serial mon:stdio -serial tcp::9876,server,nowait,nodelay -net nic,model=virtio -net user -drive file=$(DISK),if=virtio,cache=writeback,format=raw $(KVMUSER)
KERNEL ?= ./kernel/arch/x86_64/boot/bzImage
CONFIGS = configs
DATE != date +%s

/var/tmp/kernel:
	git clone /proj/i4passt/kernel/linux-stable.git  $@

kernel: /var/tmp/kernel
	ln -fs $< $@

initrd.gz linux:
	wget $(DEBBASE)/$@

kernel/vmlinux: kernel
	nice $(MAKE) -C kernel -j \$(nproc)

$(DISK):
	dd if=/dev/zero of=$@ bs=1 count=1 seek=8G

vm: $(DISK) # kernel/vmlinux
	$(EMU) $(KVMOPTS) -kernel $(KERNEL) -append "console=ttyS0 root=/dev/vda1"

vm-kgdb: $(DISK) # kernel/vmlinux
	$(EMU) $(KVMOPTS) -kernel $(KERNEL) -append "console=ttyS0 root=/dev/vda1 kgdboc=ttyS1,115200 kgdbwait"

debug:
	gdb kernel/vmlinux -ex "target remote localhost:9876"

$(CONFIGS):; mkdir $@

save-config: $(CONFIGS)
	cp kernel/.config $(CONFIGS)/backup-$(DATE)

use-last-config:
	[ -f kernel/.config ] && mv kernel/.config kernel/.config.backup
	cp $(shell ls -1t $(CONFIGS) | sed 1q) kernel/.config

.PHONY: vm debug cconfig