1CURRENT_MAKEFILE := $(realpath $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))) 2SRC_DIR := $(dir $(CURRENT_MAKEFILE)) 3TOPSRC_DIR := $(SRC_DIR)/../.. 4VPATH = $(SRC_DIR) 5 6all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin pvh.bin 7# Dummy command so that make thinks it has done something 8 @true 9 10include ../../config-host.mak 11CFLAGS = -O2 -g 12 13quiet-command = $(if $(V),$1,$(if $(2),@printf " %-7s %s\n" $2 $3 && $1, @$1)) 14cc-option = $(if $(shell $(CC) $1 -c -o /dev/null -xc /dev/null >/dev/null 2>&1 && echo OK), $1, $2) 15 16override CFLAGS += -march=i486 -Wall 17 18# Flags for dependency generation 19override CPPFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d 20 21override CFLAGS += $(filter -W%, $(QEMU_CFLAGS)) 22override CFLAGS += $(CFLAGS_NOPIE) -ffreestanding -I$(TOPSRC_DIR)/include 23override CFLAGS += $(call cc-option, -fno-stack-protector) 24override CFLAGS += $(call cc-option, -m16) 25 26ifeq ($(filter -m16, $(CFLAGS)),) 27# Attempt to work around compilers that lack -m16 (GCC <= 4.8, clang <= ??) 28# On GCC we add -fno-toplevel-reorder to keep the order of asm blocks with 29# respect to the rest of the code. clang does not have -fno-toplevel-reorder, 30# but it places all asm blocks at the beginning and we're relying on it for 31# the option ROM header. So just force clang not to use the integrated 32# assembler, which doesn't support .code16gcc. 33override CFLAGS += $(call cc-option, -fno-toplevel-reorder) 34override CFLAGS += $(call cc-option, -no-integrated-as) 35override CFLAGS += -m32 -include $(SRC_DIR)/code16gcc.h 36endif 37 38Wa = -Wa, 39override ASFLAGS += -32 40override CFLAGS += $(call cc-option, $(Wa)-32) 41 42LD_I386_EMULATION ?= elf_i386 43override LDFLAGS = -m $(LD_I386_EMULATION) -T $(SRC_DIR)/flat.lds 44 45all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin pvh.bin 46 47pvh.img: pvh.o pvh_main.o 48 49%.o: %.S 50 $(call quiet-command,$(CPP) $(CPPFLAGS) -c -o - $< | $(AS) $(ASFLAGS) -o $@,"AS","$@") 51 52%.o: %.c 53 $(call quiet-command,$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@,"CC","$@") 54 55%.img: %.o 56 $(call quiet-command,$(LD) $(LDFLAGS) -s -o $@ $^,"BUILD","$@") 57 58%.raw: %.img 59 $(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@,"BUILD","$@") 60 61%.bin: %.raw 62 $(call quiet-command,$(PYTHON) $(TOPSRC_DIR)/scripts/signrom.py $< $@,"SIGN","$@") 63 64include $(wildcard *.d) 65 66clean: 67 rm -f *.o *.d *.raw *.img *.bin *~ 68 69# suppress auto-removal of intermediate files 70.SECONDARY: 71 72.PHONY: all clean 73