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# Legacy Bios build system
#
# Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
# Output directory
OUT=out/
# Source files
SRCBOTH=output.c util.c floppy.c ata.c system.c mouse.c kbd.c pci.c \
serial.c clock.c pic.c cdrom.c ps2port.c smpdetect.c resume.c
SRC16=$(SRCBOTH) disk.c apm.c pcibios.c vgahooks.c
SRC32=$(SRCBOTH) post.c shadow.c post_menu.c memmap.c coreboot.c boot.c \
acpi.c pirtable.c smm.c mptable.c smbios.c pciinit.c \
optionroms.c
TABLESRC=font.c cbt.c floppy_dbt.c
cc-option = $(shell if test -z "`$(1) $(2) -S -o /dev/null -xc \
/dev/null 2>&1`"; then echo "$(2)"; else echo "$(3)"; fi ;)
# Default compiler flags
COMMONCFLAGS = -Wall -Os -MD -m32 -march=i386 -mregparm=3 \
-mpreferred-stack-boundary=2 -mrtd \
-ffreestanding -fwhole-program -fomit-frame-pointer \
-fno-delete-null-pointer-checks
COMMONCFLAGS += $(call cc-option,$(CC),-nopie,)
COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,)
COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,)
override CFLAGS = $(COMMONCFLAGS) -g -DMODE16=0
CFLAGS16INC = $(COMMONCFLAGS) -DMODE16=1 -fno-jump-tables -fno-defer-pop \
$(call cc-option,$(CC),--param large-stack-frame=8,)
CFLAGS16 = $(CFLAGS16INC) -g
TABLETMP=$(addprefix $(OUT), $(patsubst %.c,%.16.s,$(TABLESRC)))
all: $(OUT) $(OUT)bios.bin $(TABLETMP)
# Run with "make V=1" to see the actual compile commands
ifdef V
Q=
else
Q=@
endif
OBJCOPY=objcopy
NM=nm
STRIP=strip
.PHONY : all FORCE
vpath %.c src
vpath %.S src
################ Build rules
# Do a whole file compile - two methods are supported. The first
# involves including all the content textually via #include
# directives. The second method uses gcc's "-combine" option.
ifdef AVOIDCOMBINE
DEPHACK=
define whole-compile
@echo " Compiling whole program $3"
$(Q)printf '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c
$(Q)$(CC) $1 -c $3.tmp.c -o $3
endef
else
# Ugly way to get gcc to generate .d files correctly.
DEPHACK=-combine src/null.c
define whole-compile
@echo " Compiling whole program $3"
$(Q)$(CC) $1 -combine -c $2 -o $3
endef
endif
$(OUT)%.proc.16.s: $(OUT)%.16.s
@echo " Moving data sections to text in $@"
$(Q)sed 's/\t\.section\t\.rodata.*// ; s/\t\.data//' < $< > $@
$(OUT)%.16.s: %.c
@echo " Compiling to assembler $@"
$(Q)$(CC) $(CFLAGS16INC) $(DEPHACK) -S -c $< -o $@
$(OUT)%.lds: %.lds.S
@echo " Precompiling $@"
$(Q)$(CPP) -P -D__ASSEMBLY__ $< -o $@
$(OUT)asm-offsets.h: $(OUT)asm-offsets.16.s
@echo " Generating offset file $@"
$(Q)./tools/gen-offsets.sh $< $@
$(OUT)ccode.16.s: ; $(call whole-compile, $(CFLAGS16) -S, $(addprefix src/, $(SRC16)),$@)
TABLEASM=$(addprefix $(OUT), $(patsubst %.c,%.proc.16.s,$(TABLESRC)))
$(OUT)romlayout16.o: romlayout.S $(OUT)ccode.16.s $(OUT)asm-offsets.h $(TABLEASM)
@echo " Compiling (16bit) $@"
$(Q)$(CC) $(CFLAGS16INC) -c -D__ASSEMBLY__ $< -o $@
$(OUT)ccode32.o: ; $(call whole-compile, $(CFLAGS), $(addprefix src/, $(SRC32)),$@)
$(OUT)rom32.o: $(OUT)ccode32.o $(OUT)rombios32.lds
@echo " Linking (no relocs) $@"
$(Q)$(LD) -r -d -T $(OUT)rombios32.lds $< -o $@
$(OUT)rom16.o: $(OUT)romlayout16.o $(OUT)rom32.o $(OUT)rombios16.lds
@echo " Linking (16bit) $@"
$(Q)$(OBJCOPY) --prefix-symbols=_code32_ $(OUT)rom32.o $(OUT)rom32.rename.o
$(Q)$(LD) -T $(OUT)rombios16.lds -R $(OUT)rom32.rename.o $< -o $@
$(OUT)rom.o: $(OUT)rom16.o $(OUT)rom32.o $(OUT)rombios.lds
@echo " Linking $@"
$(Q)$(LD) -T $(OUT)rombios.lds $(OUT)rom16.o $(OUT)rom32.o -o $@
$(OUT)bios.bin.elf: $(OUT)rom.o
@echo " Prepping $@"
$(Q)$(NM) $< | ./tools/checkrom.py
$(Q)$(STRIP) $< -o $@
$(OUT)bios.bin: $(OUT)bios.bin.elf
@echo " Extracting binary $@"
$(Q)$(OBJCOPY) -O binary $< $@
####### Generic rules
clean:
$(Q)rm -rf $(OUT)
$(OUT):
$(Q)mkdir $@
-include $(OUT)*.d
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