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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
SRC16=floppy.c disk.c system.c clock.c serial.c kbd.c mouse.c output.c \
boot.c ata.c cdrom.c apm.c util.c pcibios.c pci.c
SRC32=post.c output.c rombios32.c util.c ata.c kbd.c pci.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=2 \
-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,)
CFLAGS = $(COMMONCFLAGS) -g
CFLAGS16INC = $(COMMONCFLAGS) -DMODE16 -fno-jump-tables
CFLAGS16 = $(CFLAGS16INC) -g
TABLETMP=$(addprefix $(OUT), $(patsubst %.c,%.16.s,$(TABLESRC)))
all: $(OUT) $(OUT)rom.bin $(TABLETMP)
# Run with "make V=1" to see the actual compile commands
ifdef V
Q=
else
Q=@
endif
.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"
$(Q)/bin/echo -e '$(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 " Generating assembler for $<"
$(Q)$(CC) $(CFLAGS16INC) $(DEPHACK) -S -c $< -o $@
$(OUT)%.lds: %.lds.S
@echo " Precompiling $<"
$(Q)$(CPP) -P $< -o $@
$(OUT)%.bin: $(OUT)%.o
@echo " Extracting binary $@"
$(Q)objcopy -O binary $< $@
$(OUT)%.offset.auto.h: $(OUT)%.o
@echo " Generating symbol offset header $@"
$(Q)nm $< | ./tools/defsyms.py $@
$(OUT)blob.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)blob.proc.16.s $(TABLEASM)
@echo " Generating 16bit layout of $@"
$(Q)$(CC) $(CFLAGS16) -c $< -o $@
$(OUT)rom16.o: $(OUT)romlayout16.o
@echo " Linking $@"
$(Q)ld -melf_i386 -e post16 -Ttext 0 $< -o $@
$(OUT)romlayout32.o: $(OUT)rom16.offset.auto.h ; $(call whole-compile, $(CFLAGS), $(addprefix src/, $(SRC32)),$@)
$(OUT)rom32.o: $(OUT)romlayout32.o $(OUT)rombios32.lds
@echo " Linking $@"
$(Q)ld -T $(OUT)rombios32.lds $< -o $@
$(OUT)rom.bin: $(OUT)rom16.bin $(OUT)rom32.bin $(OUT)rom16.offset.auto.h $(OUT)rom32.offset.auto.h
@echo " Building $@"
$(Q)./tools/buildrom.py
####### Generic rules
clean:
rm -rf $(OUT)
$(OUT):
mkdir $@
-include $(OUT)*.d
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