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 11 12quiet-command = $(if $(V),$1,$(if $(2),@printf " %-7s %s\n" $2 $3 && $1, @$1)) 13cc-option = $(if $(shell $(CC) $1 -S -o /dev/null -xc /dev/null >/dev/null 2>&1 && echo OK), $1, $2) 14 15# Compiling with no optimization creates ROMs that are too large 16ifeq ($(lastword $(filter -O%, -O0 $(CFLAGS))),-O0) 17override CFLAGS += -O2 18endif 19override CFLAGS += -march=i486 20 21# Flags for dependency generation 22override CPPFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d 23 24override CFLAGS += $(filter -W%, $(QEMU_CFLAGS)) 25override CFLAGS += $(CFLAGS_NOPIE) -ffreestanding -I$(TOPSRC_DIR)/include 26override CFLAGS += $(call cc-option, -fno-stack-protector) 27override CFLAGS += $(call cc-option, -m16) 28 29ifeq ($(filter -m16, $(CFLAGS)),) 30# Attempt to work around compilers that lack -m16 (GCC <= 4.8, clang <= ??) 31# On GCC we add -fno-toplevel-reorder to keep the order of asm blocks with 32# respect to the rest of the code. clang does not have -fno-toplevel-reorder, 33# but it places all asm blocks at the beginning and we're relying on it for 34# the option ROM header. So just force clang not to use the integrated 35# assembler, which doesn't support .code16gcc. 36override CFLAGS += $(call cc-option, -fno-toplevel-reorder) 37override CFLAGS += $(call cc-option, -no-integrated-as) 38override CFLAGS += -m32 -include $(SRC_DIR)/code16gcc.h 39endif 40 41Wa = -Wa, 42override ASFLAGS += -32 43override CFLAGS += $(call cc-option, $(Wa)-32) 44 45 46LD_I386_EMULATION ?= elf_i386 47override LDFLAGS = -m $(LD_I386_EMULATION) -T $(SRC_DIR)/flat.lds 48override LDFLAGS += $(LDFLAGS_NOPIE) 49 50all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin pvh.bin 51 52pvh.img: pvh.o pvh_main.o 53 54%.o: %.S 55 $(call quiet-command,$(CPP) $(CPPFLAGS) -c -o - $< | $(AS) $(ASFLAGS) -o $@,"AS","$@") 56 57%.o: %.c 58 $(call quiet-command,$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@,"CC","$@") 59 60%.img: %.o 61 $(call quiet-command,$(LD) $(LDFLAGS) -s -o $@ $^,"BUILD","$@") 62 63%.raw: %.img 64 $(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@,"BUILD","$@") 65 66%.bin: %.raw 67 $(call quiet-command,$(PYTHON) $(TOPSRC_DIR)/scripts/signrom.py $< $@,"SIGN","$@") 68 69include $(wildcard *.d) 70 71clean: 72 rm -f *.o *.d *.raw *.img *.bin *~ 73 74# suppress auto-removal of intermediate files 75.SECONDARY: 76 77.PHONY: all clean 78