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 LGPLv3 license.
11 SRCBOTH=output.c util.c floppy.c ata.c misc.c mouse.c kbd.c pci.c \
12 serial.c clock.c pic.c cdrom.c ps2port.c smpdetect.c resume.c \
14 SRC16=$(SRCBOTH) system.c disk.c apm.c pcibios.c vgahooks.c font.c
15 SRC32=$(SRCBOTH) post.c shadow.c memmap.c coreboot.c boot.c \
16 acpi.c smm.c mptable.c smbios.c pciinit.c optionroms.c mtrr.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 -Wno-strict-aliasing
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 override CFLAGS = $(COMMONCFLAGS) -g -DMODE16=0
31 CFLAGS16INC = $(COMMONCFLAGS) -DMODE16=1 -fno-jump-tables -fno-defer-pop \
32 $(call cc-option,$(CC),--param large-stack-frame=4,)
33 CFLAGS16INC += -ffunction-sections -fdata-sections
34 CFLAGS16 = $(CFLAGS16INC) -g
36 all: $(OUT) $(OUT)bios.bin
38 # Run with "make V=1" to see the actual compile commands
55 ################ Build rules
58 AVOIDCOMBINE=$(shell CC=$(CC) tools/test-combine.sh)
61 # Do a whole file compile - two methods are supported. The first
62 # involves including all the content textually via #include
63 # directives. The second method uses gcc's "-combine" option.
64 ifeq "$(AVOIDCOMBINE)" "1"
66 @echo " Compiling whole program $3"
67 $(Q)printf '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c
68 $(Q)$(CC) $1 -c $3.tmp.c -o $3
72 @echo " Compiling whole program $3"
73 $(Q)$(CC) $1 -combine -c $2 -o $3
79 @echo " Compiling to assembler $@"
80 $(Q)$(CC) $(CFLAGS16INC) -S -c $< -o $@
83 @echo " Precompiling $@"
84 $(Q)$(CPP) -P -D__ASSEMBLY__ $< -o $@
86 $(OUT)asm-offsets.h: $(OUT)asm-offsets.s
87 @echo " Generating offset file $@"
88 $(Q)./tools/gen-offsets.sh $< $@
90 $(OUT)ccode.16.s: ; $(call whole-compile, $(CFLAGS16) -S, $(addprefix src/, $(SRC16)),$@)
92 $(OUT)romlayout16.o: romlayout.S $(OUT)ccode.16.s $(OUT)asm-offsets.h
93 @echo " Compiling (16bit) $@"
94 $(Q)$(CC) $(CFLAGS16INC) -c -D__ASSEMBLY__ $< -o $@
96 $(OUT)ccode32.o: ; $(call whole-compile, $(CFLAGS), $(addprefix src/, $(SRC32)),$@)
98 $(OUT)rom32.o: $(OUT)ccode32.o $(OUT)rombios32.lds
99 @echo " Linking (no relocs) $@"
100 $(Q)$(LD) -r -d -T $(OUT)rombios32.lds $< -o $@
102 $(OUT)romlayout.lds: $(OUT)romlayout16.o
103 @echo " Building layout information $@"
104 $(Q)$(OBJDUMP) -h $< | ./tools/layoutrom.py $@
106 $(OUT)rombios16.lds: $(OUT)romlayout.lds
108 $(OUT)rom16.o: $(OUT)romlayout16.o $(OUT)rom32.o $(OUT)rombios16.lds
109 @echo " Linking (16bit) $@"
110 $(Q)$(OBJCOPY) --prefix-symbols=_code32_ $(OUT)rom32.o $(OUT)rom32.rename.o
111 $(Q)$(LD) -T $(OUT)rombios16.lds -R $(OUT)rom32.rename.o $< -o $@
113 $(OUT)rom.o: $(OUT)rom16.o $(OUT)rom32.o $(OUT)rombios.lds
115 $(Q)$(LD) -T $(OUT)rombios.lds $(OUT)rom16.o $(OUT)rom32.o -o $@
117 $(OUT)bios.bin.elf: $(OUT)rom.o
119 $(Q)$(NM) $< | ./tools/checkrom.py
120 $(Q)$(STRIP) $< -o $@
122 $(OUT)bios.bin: $(OUT)bios.bin.elf
123 @echo " Extracting binary $@"
124 $(Q)$(OBJCOPY) -O binary $< $@
127 ####### Generic rules