usr/src/boot/sys/boot/i386/boot2/Makefile

# $FreeBSD$

.include <bsd.own.mk>

FILES=		boot boot1 boot2

NM?=		nm

# A value of 0x80 enables LBA support.
BOOT_BOOT1_FLAGS?=	0x80

BOOT_COMCONSOLE_PORT?= 0x3f8
BOOT_COMCONSOLE_SPEED?= 9600
B2SIOFMT?=	0x3

REL1=	0x700
ORG1=	0x7c00
ORG2=	0x2000

# Decide level of UFS support.
BOOT2_UFS?=	UFS1_AND_UFS2
#BOOT2_UFS?=	UFS2_ONLY
#BOOT2_UFS?=	UFS1_ONLY

CFLAGS=	-fomit-frame-pointer \
	-mrtd \
	-mregparm=3 \
	-DUSE_XREAD \
	-D${BOOT2_UFS} \
	-DFLAGS=${BOOT_BOOT1_FLAGS} \
	-DSIOPRT=${BOOT_COMCONSOLE_PORT} \
	-DSIOFMT=${B2SIOFMT} \
	-DSIOSPD=${BOOT_COMCONSOLE_SPEED} \
	-I${.CURDIR}/../../common \
	-I${.CURDIR}/../btx/lib -I. \
	-Wall -Waggregate-return -Wbad-function-cast -Wcast-align \
	-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
	-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings \
	-Winline

CFLAGS.gcc+=	-Os \
		-fno-guess-branch-probability \
		-fno-unit-at-a-time \
		--param max-inline-insns-single=100
.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} <= 40201
CFLAGS.gcc+=   -mno-align-long-strings
.endif

CFLAGS.clang+=	-Oz ${CLANG_OPT_SMALL}

LD_FLAGS=-static -N --gc-sections

# Pick up ../Makefile.inc early.
.include <bsd.init.mk>

CLEANFILES=	boot

boot: boot1 boot2
	cat boot1 boot2 > boot

CLEANFILES+=	boot1 boot1.out boot1.o

boot1: boot1.out
	${OBJCOPY} -S -O binary boot1.out ${.TARGET}

boot1.out: boot1.o
	${LD} ${LD_FLAGS} -e start -Ttext ${ORG1} -o ${.TARGET} boot1.o

CLEANFILES+=	boot2 boot2.ld boot2.ldr boot2.bin boot2.out boot2.o \
		boot2.s boot2.s.tmp boot2.h sio.o

boot2: boot2.ld
	@set -- `ls -l boot2.ld`; x=$$((7680-$$5)); \
	    echo "$$x bytes available"; test $$x -ge 0
	dd if=boot2.ld of=${.TARGET} obs=7680 conv=osync status=none

boot2.ld: boot2.ldr boot2.bin ${BTXKERN}
	btxld -v -E ${ORG2} -f bin -b ${BTXKERN} -l boot2.ldr \
	    -o ${.TARGET} -P 1 boot2.bin

boot2.ldr:
	dd if=/dev/zero of=${.TARGET} bs=512 count=1 status=none

boot2.bin: boot2.out
	${OBJCOPY} -S -O binary boot2.out ${.TARGET}

boot2.out: ${BTXCRT} boot2.o sio.o
	${LD} ${LD_FLAGS} -Ttext ${ORG2} -o ${.TARGET} ${.ALLSRC}

boot2.o: boot2.s
	${CC} ${ACFLAGS} -c boot2.s

SRCS=	boot2.c boot2.h

boot2.s: boot2.c boot2.h ${.CURDIR}/../../common/ufsread.c
	${CC} ${CFLAGS} -S -o boot2.s.tmp ${.CURDIR}/boot2.c
	sed -e '/align/d' -e '/nop/d' < boot2.s.tmp > boot2.s
	rm -f boot2.s.tmp

boot2.h: boot1.out
	${NM} -t d ${.ALLSRC} | awk '/([0-9])+ T xread/ \
	    { x = $$1 - ORG1; \
	    printf("#define XREADORG %#x\n", REL1 + x) }' \
	    ORG1=`printf "%d" ${ORG1}` \
	    REL1=`printf "%d" ${REL1}` > ${.TARGET}

.if ${MACHINE_CPUARCH} == "amd64"
beforedepend boot2.s: machine
CLEANFILES+=	machine
machine: ${.CURDIR}/../../../i386/include .NOMETA
	ln -sf ${.ALLSRC} ${.TARGET}
.endif

.include <bsd.prog.mk>

# XXX: clang integrated-as doesn't grok .codeNN directives yet
CFLAGS.boot1.S=		${CLANG_NO_IAS}
CFLAGS+=		${CFLAGS.${.IMPSRC:T}}