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 boot.c
14 cc-option = $(shell if test -z "`$(1) $(2) -S -o /dev/null -xc \
15 /dev/null 2>&1`"; then echo "$(2)"; else echo "$(3)"; fi ;)
17 # Default compiler flags
18 COMMONCFLAGS = -Wall -Os -MD -m32 -march=i386 -mregparm=2 -ffreestanding
19 COMMONCFLAGS += $(call cc-option,$(CC),-nopie,)
20 COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,)
21 COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,)
23 CFLAGS = $(COMMONCFLAGS) -g
24 CFLAGS16 = $(COMMONCFLAGS) -DMODE16 -fno-jump-tables
25 CFLAGS16WHOLE = $(CFLAGS16) -g -fwhole-program
27 all: $(OUT) $(OUT)rom.bin
29 # Run with "make V=1" to see the actual compile commands
41 ################ Build rules
42 $(OUT)%.proc.16.s: $(OUT)%.16.s
43 @echo " Moving data sections to text in $<"
44 $(Q)sed 's/\t\.section\t\.rodata.*// ; s/\t\.data//' < $< > $@
47 @echo " Generating assembler for $<"
48 $(Q)$(CC) $(CFLAGS16) -fwhole-program -S -combine -c $< src/null.c -o $@
51 @echo " Precompiling $<"
52 $(Q)$(CPP) -P $< -o $@
54 $(OUT)%.bin: $(OUT)%.o
55 @echo " Extracting binary $@"
56 $(Q)objcopy -O binary $< $@
58 $(OUT)%.offset.auto.h: $(OUT)%.o
59 @echo " Generating symbol offset header $@"
60 $(Q)nm $< | ./tools/defsyms.py > $@
63 @echo " Generating whole program assembler $@"
64 $(Q)$(CC) $(CFLAGS16WHOLE) -S -combine -c $(addprefix src/, $(SRC16)) -o $@
66 $(OUT)romlayout16.o: romlayout.S $(OUT)blob.proc.16.s $(OUT)font.proc.16.s $(OUT)cbt.proc.16.s
67 @echo " Generating 16bit layout of $@"
68 $(Q)$(CC) $(CFLAGS16) -c $< -o $@
70 $(OUT)rom16.o: $(OUT)romlayout16.o
72 $(Q)ld -melf_i386 -e post16 -Ttext 0 $< -o $@
74 $(OUT)rom16.bin: $(OUT)rom16.o
75 @echo " Extracting binary $@"
76 $(Q)objcopy -O binary $< $@
78 $(OUT)romlayout32.o: $(OUT)rom16.offset.auto.h
79 @echo " Compiling whole program $@"
80 $(Q)$(CC) $(CFLAGS) -fwhole-program -combine -c $(addprefix src/, $(SRC32)) -o $@
82 $(OUT)rom32.o: $(OUT)romlayout32.o $(OUT)rombios32.lds
84 $(Q)ld -T $(OUT)rombios32.lds $< -o $@
86 $(OUT)rom.bin: $(OUT)rom16.bin $(OUT)rom32.bin $(OUT)rom16.offset.auto.h $(OUT)rom32.offset.auto.h
88 $(Q)./tools/buildrom.py