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 SRCBOTH=output.c util.c floppy.c ata.c system.c mouse.c kbd.c pci.c boot.c \
12 serial.c clock.c pic.c
13 SRC16=$(SRCBOTH) disk.c cdrom.c apm.c pcibios.c
14 SRC32=$(SRCBOTH) post.c shadow.c post_menu.c memmap.c coreboot.c \
15 acpi.c pirtable.c smm.c smpdetect.c mptable.c smbios.c pciinit.c
16 TABLESRC=font.c cbt.c floppy_dbt.c
18 cc-option = $(shell if test -z "`$(1) $(2) -S -o /dev/null -xc \
19 /dev/null 2>&1`"; then echo "$(2)"; else echo "$(3)"; fi ;)
21 # Default compiler flags
22 COMMONCFLAGS = -Wall -Os -MD -m32 -march=i386 -mregparm=3 \
23 -mpreferred-stack-boundary=2 -mrtd \
24 -ffreestanding -fwhole-program -fomit-frame-pointer \
25 -fno-delete-null-pointer-checks
26 COMMONCFLAGS += $(call cc-option,$(CC),-nopie,)
27 COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,)
28 COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,)
30 CFLAGS = $(COMMONCFLAGS) -g
31 CFLAGS16INC = $(COMMONCFLAGS) -DMODE16 -fno-jump-tables -fno-defer-pop \
32 $(call cc-option,$(CC),--param large-stack-frame=8,)
33 CFLAGS16 = $(CFLAGS16INC) -g
35 TABLETMP=$(addprefix $(OUT), $(patsubst %.c,%.16.s,$(TABLESRC)))
36 all: $(OUT) $(OUT)bios.bin $(TABLETMP)
38 # Run with "make V=1" to see the actual compile commands
50 ################ Build rules
52 # Do a whole file compile - two methods are supported. The first
53 # involves including all the content textually via #include
54 # directives. The second method uses gcc's "-combine" option.
58 @echo " Compiling whole program $3"
59 $(Q)/bin/echo -e '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c
60 $(Q)$(CC) $1 -c $3.tmp.c -o $3
63 # Ugly way to get gcc to generate .d files correctly.
64 DEPHACK=-combine src/null.c
66 @echo " Compiling whole program $3"
67 $(Q)$(CC) $1 -combine -c $2 -o $3
72 $(OUT)%.proc.16.s: $(OUT)%.16.s
73 @echo " Moving data sections to text in $<"
74 $(Q)sed 's/\t\.section\t\.rodata.*// ; s/\t\.data//' < $< > $@
77 @echo " Generating assembler for $<"
78 $(Q)$(CC) $(CFLAGS16INC) $(DEPHACK) -S -c $< -o $@
81 @echo " Precompiling $<"
82 $(Q)$(CPP) -P $< -o $@
85 $(OUT)blob.16.s: ; $(call whole-compile, $(CFLAGS16) -S, $(addprefix src/, $(SRC16)),$@)
87 TABLEASM=$(addprefix $(OUT), $(patsubst %.c,%.proc.16.s,$(TABLESRC)))
88 $(OUT)romlayout16.o: romlayout.S $(OUT)blob.16.s $(TABLEASM)
89 @echo " Generating 16bit layout of $@"
90 $(Q)$(CC) $(CFLAGS16) -c $< -o $@
92 $(OUT)romlayout32.o: ; $(call whole-compile, $(CFLAGS), $(addprefix src/, $(SRC32)),$@)
94 $(OUT)rom32.notreloc.o: $(OUT)romlayout32.o $(OUT)rombios32.lds
95 @echo " Linking (no relocs) $@"
96 $(Q)ld -r -T $(OUT)rombios32.lds $< -o $@.raw
97 $(Q)objcopy --prefix-symbols=_code32_ $@.raw $@
99 $(OUT)rom16.o: $(OUT)romlayout16.o $(OUT)rom32.notreloc.o $(OUT)rombios16.lds
101 $(Q)ld -T $(OUT)rombios16.lds -R $(OUT)rom32.notreloc.o $< -o $@
103 $(OUT)rom32.o: $(OUT)rom16.o $(OUT)romlayout32.o $(OUT)rombios32.lds
105 $(Q)ld -T $(OUT)rombios32.lds $(OUT)rom16.o $(OUT)romlayout32.o -o $@
107 $(OUT)bios.bin.elf: $(OUT)rom32.o
109 $(Q)nm $< | ./tools/checkrom.py
112 $(OUT)bios.bin: $(OUT)bios.bin.elf
113 @echo " Extracting binary $@"
114 $(Q)objcopy -O binary $< $@
117 ####### Generic rules