1 # Legacy Bios build system
3 # Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
5 # This file may be distributed under the terms of the GNU GPLv3 license.
11 SRC16=floppy.c disk.c system.c clock.c serial.c kbd.c mouse.c output.c \
14 TABLESRC=font.c cbt.c floppy_dbt.c
16 cc-option = $(shell if test -z "`$(1) $(2) -S -o /dev/null -xc \
17 /dev/null 2>&1`"; then echo "$(2)"; else echo "$(3)"; fi ;)
19 # Default compiler flags
20 COMMONCFLAGS = -Wall -Os -MD -m32 -march=i386 -mregparm=2 -ffreestanding
21 COMMONCFLAGS += $(call cc-option,$(CC),-nopie,)
22 COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,)
23 COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,)
25 CFLAGS = $(COMMONCFLAGS) -g
26 CFLAGS16 = $(COMMONCFLAGS) -DMODE16 -fno-jump-tables
27 CFLAGS16WHOLE = $(CFLAGS16) -g -fwhole-program
29 TABLETMP=$(addprefix $(OUT), $(patsubst %.c,%.16.s,$(TABLESRC)))
30 all: $(OUT) $(OUT)rom.bin $(TABLETMP)
32 # Run with "make V=1" to see the actual compile commands
44 ################ Build rules
45 $(OUT)%.proc.16.s: $(OUT)%.16.s
46 @echo " Moving data sections to text in $<"
47 $(Q)sed 's/\t\.section\t\.rodata.*// ; s/\t\.data//' < $< > $@
50 @echo " Generating assembler for $<"
51 $(Q)$(CC) $(CFLAGS16) -fwhole-program -S -combine -c $< src/null.c -o $@
54 @echo " Precompiling $<"
55 $(Q)$(CPP) -P $< -o $@
57 $(OUT)%.bin: $(OUT)%.o
58 @echo " Extracting binary $@"
59 $(Q)objcopy -O binary $< $@
61 $(OUT)%.offset.auto.h: $(OUT)%.o
62 @echo " Generating symbol offset header $@"
63 $(Q)nm $< | ./tools/defsyms.py $@
66 @echo " Generating whole program assembler $@"
67 $(Q)$(CC) $(CFLAGS16WHOLE) -S -combine -c $(addprefix src/, $(SRC16)) -o $@
69 TABLEASM=$(addprefix $(OUT), $(patsubst %.c,%.proc.16.s,$(TABLESRC)))
70 $(OUT)romlayout16.o: romlayout.S $(OUT)blob.proc.16.s $(TABLEASM)
71 @echo " Generating 16bit layout of $@"
72 $(Q)$(CC) $(CFLAGS16) -c $< -o $@
74 $(OUT)rom16.o: $(OUT)romlayout16.o
76 $(Q)ld -melf_i386 -e post16 -Ttext 0 $< -o $@
78 $(OUT)rom16.bin: $(OUT)rom16.o
79 @echo " Extracting binary $@"
80 $(Q)objcopy -O binary $< $@
82 $(OUT)romlayout32.o: $(OUT)rom16.offset.auto.h
83 @echo " Compiling whole program $@"
84 $(Q)$(CC) $(CFLAGS) -fwhole-program -combine -c $(addprefix src/, $(SRC32)) -o $@
86 $(OUT)rom32.o: $(OUT)romlayout32.o $(OUT)rombios32.lds
88 $(Q)ld -T $(OUT)rombios32.lds $< -o $@
90 $(OUT)rom.bin: $(OUT)rom16.bin $(OUT)rom32.bin $(OUT)rom16.offset.auto.h $(OUT)rom32.offset.auto.h
92 $(Q)./tools/buildrom.py