# Allow to run kernel on different emulators with different prebuilt rootfs

# Rootfs preparation
hda:
	$(Q)(cd $(ROOTFS_DIR); make $@)

flp:
	$(Q)(cd $(ROOTFS_DIR); make $@)

ramfs:
	$(Q)(cd $(ROOTFS_DIR); make $@)

hda-install:
	$(Q)(cd $(ROOTFS_DIR); make $@)

hd-install: hda-install
install-hd: hd-install

flp-install:
	$(Q)(cd $(ROOTFS_DIR); make $@)

fd-install: flp-install
install-fd: fd-install

ramfs-install:
	$(Q)(cd $(ROOTFS_DIR); make $@)

install-ramfs: ramfs-install

hda-mount:
	$(Q)(cd $(ROOTFS_DIR); make $@)

hda-umount:
	$(Q)(cd $(ROOTFS_DIR); make $@)

hd-mount: hda-mount
mount-hd: hd-mount
hd-umount: hda-umount
umount-hd: hd-umount

flp-mount:
	$(Q)(cd $(ROOTFS_DIR); make $@)

flp-umount:
	$(Q)(cd $(ROOTFS_DIR); make $@)

fd-mount: flp-mount
mount-fd: fd-mount
fd-umount: flp-umount
umount-fd: fd-umount

ramfs-mount:
	$(Q)(cd $(ROOTFS_DIR); make $@)

ramfs-umount:
	$(Q)(cd $(ROOTFS_DIR); make $@)


mount-ramfs: ramfs-mount
umount-ramfs: ramfs-umount

# VM (Qemu/Bochs) Setting for different rootfs

ROOT_RAM = 0000
ROOT_FDB = 021d
ROOT_HDA = 0301

SETROOTDEV_CMD = $(SETROOTDEV) $(LINUX_IMAGE)
SETROOTDEV_CMD_RAM = $(SETROOTDEV_CMD) $(ROOT_RAM) $(ROOTFS_DIR)/$(RAM_IMG)
SETROOTDEV_CMD_FDB = $(SETROOTDEV_CMD) $(ROOT_FDB)
SETROOTDEV_CMD_HDA = $(SETROOTDEV_CMD) $(ROOT_HDA)

QEMU_CMD = $(QEMU)
_QEMU_CMD = $(QEMU)

ifeq ($(QEMU_PREBUILT),1)
  QEMU_STATUS = $(shell $(QEMU_PATH)/$(QEMU) --help >/dev/null 2>&1; echo $$?)
  ifeq ($(QEMU_STATUS), 0)
    QEMU_CMD := $(QEMU_PATH)/$(QEMU) $(QEMU_XOPTS)
    _QEMU_CMD := $(QEMU_PATH)/$(QEMU) $(QEMU_XOPTS)
  endif
endif

_BOCHS_CMD = $(BOCHS)
ifeq ($(BOCHS_PREBUILT),1)
  BOCHS_STATUS = $(shell $(BOCHS_PATH)/$(BOCHS) --help >/dev/null 2>&1; echo $$?)
  ifeq ($(BOCHS_STATUS), 0)
    _BOCHS_CMD := $(BOCHS_PATH)/$(BOCHS)
  endif
endif

_QEMU_CMD += $(_QEMU_OPTS)
QEMU_CMD += $(QEMU_OPTS)

QEMU_CMD_FDB = $(QEMU_CMD) -fdb $(ROOTFS_DIR)/$(FLP_IMG)
QEMU_CMD_HDA = $(QEMU_CMD) -hda $(ROOTFS_DIR)/$(HDA_IMG)
_QEMU_CMD_HDA = $(_QEMU_CMD) -hda $(ROOTFS_DIR)/$(HDA_IMG)
nullstring :=
QEMU_DBG = $(nullstring) -s -S #-nographic #-serial '/dev/ttyS0'"

BOCHS_CFG = $(TOOL_DIR)/bochs/bochsrc
BOCHS_CMD = $(_BOCHS_CMD) -q -f $(BOCHS_CFG)/bochsrc-fda.bxrc
BOCHS_CMD_FDB = $(_BOCHS_CMD) -q -f $(BOCHS_CFG)/bochsrc-fdb.bxrc
BOCHS_CMD_HDA = $(_BOCHS_CMD) -q -f $(BOCHS_CFG)/bochsrc-hd.bxrc
BOCHS_DBG = .dbg

ifneq ($(VM),)
  NEW_VM = $(VM)
else
  VM ?= $(shell cat $(VM_CFG) 2>/dev/null)

  ifeq ($(VM), bochs)
    NEW_VM=qemu
  else
    NEW_VM=bochs
  endif
endif

switch:
	$(Q)echo "Switch to use emulator: $(NEW_VM)"
	$(Q)echo $(NEW_VM) > $(VM_CFG)

VM=$(shell cat $(VM_CFG) 2>/dev/null)

ifeq ($(VM), bochs)
  VM_CMD = $(BOCHS_CMD)
  VM_CMD_FDB = $(BOCHS_CMD_FDB)
  VM_CMD_HDA = $(BOCHS_CMD_HDA)
  VM_DBG = $(BOCHS_DBG)
else
  VM_CMD = $(QEMU_CMD)
  VM_CMD_FDB = $(QEMU_CMD_FDB)
  VM_CMD_HDA = $(QEMU_CMD_HDA)
  _VM_CMD_HDA = $(_QEMU_CMD_HDA)
  VM_DBG = $(QEMU_DBG)
endif

# Allow to use curses based console via ssh
# Exit with 'ESC + 2' + quit
ifneq ($(SSH_TTY),)
  override G := 0
endif
ifeq ($(XTERM),null)
  override G := 0
endif

VM_DISPLAY =
ifeq ($(G),0)
  ifeq ($(VM), bochs)
    VM_DISPLAY = .term
  else
    VM_DISPLAY = $(nullstring) -curses
  endif
endif

# Running on emulators with differrent rootfs
ramdisk-boot: ramfs $(LINUX_SRC)
	@# Force init/main.o build with ramdisk support
	$(Q)(cd $(LINUX_SRC); make -B init/main.o \
	RAMDISK_SIZE=$(shell wc -c $(ROOTFS_DIR)/$(RAM_IMG) | tr -C -d '[0-9]' | xargs -i echo {}/1024 + 1 | bc))
	$(Q)(cd $(LINUX_SRC); make -B kernel/blk_drv/blk_drv.a RAMDISK_START=$(RAMDISK_START))

# Boot with Image and Rootfs from harddisk
hd-boot: hd-start

# Boot with rootfs from ramfs, floppy and hardisk
boot-hd: start-hd
boot-fd: start-fd
boot: start
_boot: _start

start: ramdisk-boot Image
	$(SETROOTDEV_CMD_RAM)
	$(VM_CMD)$(VM_DISPLAY)

start-fd: Image flp
	$(SETROOTDEV_CMD_FDB)
	$(VM_CMD_FDB)$(VM_DISPLAY)

ifeq ($(OS), Linux)
  MINIX_FS = $(shell lsmod | grep minix 2>/dev/null; echo $$?)
  ifeq ($(MINIX_FS), 0)
    HDA_INSTALL = hda-install
  else
    MINIX_FS = $(shell sudo modprobe minix 2>/dev/null; echo $$?)
    ifeq ($(MINIX_FS), 0)
      HDA_INSTALL = hda-install
    endif
  endif
endif

start-hd: Image hda $(HDA_INSTALL)
	$(SETROOTDEV_CMD_HDA)
	$(VM_CMD_HDA)$(VM_DISPLAY)

hd-start: Image hda $(HDA_INSTALL)
	$(_VM_CMD_HDA)$(VM_DISPLAY)

# For any other images
_start:
	$(VM_CMD)$(VM_DISPLAY)

# see examples/linux-0.11/README.md
LINUX_000 ?= $(ROOTFS_DIR)/_hda/usr/root/examples/linux-0.00/Image
linux-0.00:
	$(Q)(cd $(ROOTFS_DIR); make hda-mount)
	$(Q)sudo make _start LINUX_IMAGE=$(LINUX_000)
	$(Q)(cd $(ROOTFS_DIR); make hda-umount)

# Debugging the above targets

GDB_CMD ?= $(GDB) --quiet $(DST)

ifneq ($(XTERM), null)
  XTERM_CMD ?= $(Q)$(XTERM) --working-directory=$(CURDIR) -T "$(GDB_CMD)" -e "$(GDB_CMD)"

  XTERM_STATUS = $(shell $(XTERM) --help >/dev/null 2>&1; echo $$?)
else
  XTERM_STATUS := 1
  XTERM_CMD    := null
endif
ifeq ($(XTERM_STATUS), 0)
  DEBUG_CMD = $(XTERM_CMD)
else
  DEBUG_CMD = $(Q)echo "\nLOG: Please run this in another terminal:\n\n    " $(GDB_CMD) "\n"
endif

gdbinit:
	$(Q)echo "add-auto-load-safe-path .gdbinit" > $(HOME)/.gdbinit
ifeq ($(findstring kernel,$(DST)),kernel)
	$(Q)cp .kernel_gdbinit .gdbinit
else
	$(Q)cp .boot_gdbinit .gdbinit
endif
ifeq ($(OS), Darwin)
	$(Q)cd tools/mac && [ -f gdb.xz ] && tar Jxf gdb.xz
endif

debug: ramdisk-boot Image gdbinit
	$(SETROOTDEV_CMD_RAM)
	$(DEBUG_CMD) &
	$(VM_CMD)$(VM_DBG)$(VM_DISPLAY)

debug-fd: Image flp gdbinit
	$(SETROOTDEV_CMD_FDB)
	$(DEBUG_CMD) &
	$(VM_CMD_FDB)$(VM_DBG)$(VM_DISPLAY)

debug-hd: Image hda gdbinit
	$(SETROOTDEV_CMD_HDA)
	$(DEBUG_CMD) &
	$(VM_CMD_HDA)$(VM_DBG)$(VM_DISPLAY)