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# Force i386-only instructions
#
CFLAGS += -march=i386
# Code size reduction.
#
CFLAGS += -fstrength-reduce -fomit-frame-pointer
# Code size reduction. gcc3 needs a different syntax to gcc2 if you
# want to avoid spurious warnings.
#
GCC_VERSION := $(subst ., ,$(shell $(CC) -dumpversion))
GCC_MAJOR := $(firstword $(GCC_VERSION))
ifeq ($(GCC_MAJOR),2)
CFLAGS += -malign-jumps=1 -malign-loops=1 -malign-functions=1
else
CFLAGS += -falign-jumps=1 -falign-loops=1 -falign-functions=1
endif
# Code size reduction. This is almost always a win. The kernel uses it, too.
#
CFLAGS += -mpreferred-stack-boundary=2
# Code size reduction. Use regparm for all functions - C functions
# called from assembly (or vice versa) need __cdecl now
#
CFLAGS += -mregparm=3
# Code size reduction. Use -mrtd (same __cdecl requirements as above)
CFLAGS += -mrtd
# Code size reduction. This is the logical complement to -mregparm=3.
# It doesn't currently buy us anything, but if anything ever tries to
# return small structures, let's be prepared
#
CFLAGS += -freg-struct-return
# Stop ld from complaining about our customised linker script
#
LDFLAGS += -N --no-check-sections
# Force 32-bit code even on an x86-64 machine
#
CFLAGS += -m32
ASFLAGS += --32
LDFLAGS += -m elf_i386
# EFI requires -fshort-wchar, and nothing else currently uses wchar_t
#
CFLAGS += -fshort-wchar
# We need to undefine the default macro "i386" when compiling .S
# files, otherwise ".arch i386" translates to ".arch 1"...
#
CFLAGS += -Ui386
# Locations of utilities
#
ISOLINUX_BIN = /usr/lib/syslinux/isolinux.bin
# i386-specific directories containing source files
#
SRCDIRS += arch/i386/core arch/i386/transitions arch/i386/prefix
SRCDIRS += arch/i386/firmware/pcbios
SRCDIRS += arch/i386/image
SRCDIRS += arch/i386/drivers
SRCDIRS += arch/i386/drivers/net
SRCDIRS += arch/i386/interface/pcbios
SRCDIRS += arch/i386/interface/pxe
SRCDIRS += arch/i386/interface/syslinux
# The various xxx_loader.c files are #included into core/loader.c and
# should not be compiled directly.
#
NON_AUTO_SRCS += arch/i386/core/aout_loader.c
NON_AUTO_SRCS += arch/i386/core/freebsd_loader.c
NON_AUTO_SRCS += arch/i386/core/wince_loader.c
# unnrv2b.S is used to generate a 16-bit as well as a 32-bit object.
#
OBJS_unnrv2b = unnrv2b unnrv2b16
CFLAGS_unnrv2b16 = -DCODE16
# The i386 linker script
#
LDSCRIPT = arch/i386/scripts/i386.lds
# Media types.
#
MEDIA += rom
MEDIA += pxe
MEDIA += kpxe
MEDIA += elf
MEDIA += elfd
MEDIA += lmelf
MEDIA += lmelfd
MEDIA += lkrn
MEDIA += bImage
MEDIA += dsk
MEDIA += nbi
MEDIA += hd
MEDIA += raw
MEDIA += com
MEDIA += exe
# Special target for building Master Boot Record binary
$(BIN)/mbr.bin : $(BIN)/mbr.o
$(OBJCOPY) -O binary $< $@
# Some suffixes (e.g. %.fd0) are generated directly from other
# finished files (e.g. %.dsk), rather than having their own prefix.
# rule to write disk images to /dev/fd0
NON_AUTO_MEDIA += fd0
%fd0 : %dsk
dd if=$< bs=512 conv=sync of=/dev/fd0
sync
# rule to create padded disk images
NON_AUTO_MEDIA += pdsk
%pdsk : %dsk
cp $< $@
$(PERL) ./util/dskpad.pl $@
# rule to make a non-emulation ISO boot image
NON_AUTO_MEDIA += iso
%iso: %lkrn util/geniso
ISOLINUX_BIN=$(ISOLINUX_BIN) bash util/geniso $@ $<
# rule to make a floppy emulation ISO boot image
NON_AUTO_MEDIA += liso
%liso: %lkrn util/genliso
bash util/genliso $@ $<
# rule to make a USB disk image
$(BIN)/usbdisk.bin : $(BIN)/usbdisk.o
$(OBJCOPY) -O binary $< $@
NON_AUTO_MEDIA += usb
%usb: $(BIN)/usbdisk.bin %hd
cat $^ > $@
# Add NON_AUTO_MEDIA to the media list, so that they show up in the
# output of "make"
#
MEDIA += $(NON_AUTO_MEDIA)
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